Calculators

Find letter codes to EN IEC 81346-2

Which letter code belongs to a contactor, a temperature probe or a PE terminal? Search by term or letter, or click through the classes. One click takes the letter code into the reference designation builder.

Term or letter code

BSensing quantities and conditions as signals102 letter codes

BSensing quantities and conditions as signalsUse in builder
BASensing electrical voltageUse in builder
BAAVoltage sensing with measured value outputFor example Voltage transformer, Voltage transducerUse in builder
BABVoltage monitoring with switching outputFor example Voltage monitoring relay, Undervoltage relay, Overvoltage relayUse in builder
BBSensing resistance and conductivityUse in builder
BBAElectrical resistance measurement with measured value outputFor example Insulation resistance tester, Conductivity meterUse in builder
BBBElectrical resistance monitoring with switching outputFor example Insulation monitoring deviceUse in builder
BBCThermal resistance measurement with measured value outputUse in builder
BBDThermal resistance monitoring with switching outputUse in builder
BCSensing electric currentUse in builder
BCACurrent sensing with measured value outputFor example Current transformer, Hall effect current sensor, Rogowski coil, Current transducerUse in builder
BCBCurrent monitoring with switching outputFor example Thermal overload relay, Current monitoring relay, Residual current monitoring relayUse in builder
BDSensing densityUse in builder
BDADensity measurement with measured value outputFor example Density transmitter, HydrometerUse in builder
BDBDensity monitoring with switching outputFor example Density switch, SF6 gas density monitorUse in builder
BESensing electric and magnetic fieldsUse in builder
BEAElectric field measurement with measured value outputFor example Electric field strength probeUse in builder
BEBElectric field detection with switching outputUse in builder
BECMagnetic field measurement with measured value outputFor example Magnetometer, TeslameterUse in builder
BEDMagnetic field detection with switching outputFor example Reed contact, Hall effect switchUse in builder
BFSensing flowUse in builder
BFAFlow measurement with measured value outputFor example Electromagnetic flowmeter, Coriolis flowmeter, Ultrasonic flowmeterUse in builder
BFBFlow monitoring with switching outputFor example Flow monitor, Paddle flow switch, Calorimetric flow monitorUse in builder
BGSensing position, distance and dimensionsUse in builder
BGAPosition sensing with measured value outputFor example GNSS position receiver, Magnetostrictive position sensorUse in builder
BGBPosition detection with switching outputFor example Limit switch, Inductive proximity switch, Motion detectorUse in builder
BGCDistance measurement with measured value outputFor example Laser distance sensor, Ultrasonic distance sensor, Draw-wire displacement sensorUse in builder
BGDDistance monitoring with switching outputFor example Ultrasonic proximity switch, Laser distance switchUse in builder
BGEAngle and direction measurement with measured value outputFor example Absolute rotary encoder, Resolver, Inclination sensor, Wind direction sensorUse in builder
BGFAngle and direction monitoring with switching outputFor example Tilt switchUse in builder
BGGScanning the shape and location of objectsFor example Laser scanner, 3D scanner, Coordinate measuring machineUse in builder
BHSensing amounts of energyUse in builder
BHAEnergy metering of flows with known energy contentUse in builder
BHBHeat metering in heating and cooling circuitsFor example Heat meter, Cooling energy meterUse in builder
BHCElectrical energy meteringFor example Electricity meter, Smart meter, DIN rail energy meterUse in builder
BJSensing electrical powerUse in builder
BJAPower measurement with measured value outputFor example Power transducerUse in builder
BJBPower monitoring with switching outputFor example Power monitoring relay, Reverse power relayUse in builder
BKSensing timeUse in builder
BKATime measurement with measured value outputFor example Radio-controlled clock, GPS time serverUse in builder
BKBTime monitoring with switching outputFor example Time switch, Astronomical time switchUse in builder
BLSensing levelUse in builder
BLALevel measurement with measured value outputFor example Radar level transmitter, Hydrostatic level probe, Ultrasonic level sensorUse in builder
BLBLevel monitoring with switching outputFor example Float switch, Vibrating level switch, Capacitive point level switchUse in builder
BMSensing humidity and moistureUse in builder
BMAHumidity measurement with measured value outputFor example Humidity transmitter, Room humidity sensor, Dew point sensorUse in builder
BMBHumidity monitoring with switching outputFor example Hygrostat, Dew point monitorUse in builder
BPSensing pressureUse in builder
BPAAbsolute pressure measurement with measured value outputFor example Absolute pressure sensor, Barometric pressure sensor, Pressure transmitterUse in builder
BPBAbsolute pressure monitoring with switching outputFor example Pressure switch, Pressure monitorUse in builder
BPCDifferential pressure measurement with measured value outputFor example Differential pressure transmitter, Gauge pressure sensorUse in builder
BPDDifferential pressure monitoring with switching outputFor example Differential pressure switch, Filter monitorUse in builder
BQSensing substance concentrationsUse in builder
BQAGas concentration measurement with measured value outputFor example CO2 sensor, CO sensor, Oxygen sensor, Gas analyserUse in builder
BQBGas concentration monitoring with switching outputFor example Gas detector, CO alarmUse in builder
BQCConcentration measurement of liquid substances with measured value outputFor example Fog sensor, Visibility sensorUse in builder
BQDConcentration monitoring of liquid substances with switching outputFor example Fog detector, Oil mist detectorUse in builder
BQEConcentration measurement of solid substances with measured value outputFor example Dust concentration monitor, Turbidity sensor, Particulate matter sensorUse in builder
BQFConcentration monitoring of solid substances with switching outputFor example Smoke detector, Aspirating smoke detector, Dust monitorUse in builder
BRSensing radiationUse in builder
BRALight measurement with measured value outputFor example Brightness sensor, Lux meter, PhotocellUse in builder
BRBLight detection with switching outputFor example Twilight switch, Light barrierUse in builder
BRCMeasurement of invisible electromagnetic radiation with measured value outputFor example Infrared sensor, UV radiation sensorUse in builder
BRDDetection of invisible electromagnetic radiation with switching outputFor example UV flame monitor, Infrared flame detectorUse in builder
BREMeasurement of ionising particle radiation with measured value outputFor example Geiger-Müller counter, Dose rate meterUse in builder
BRFDetection of ionising particle radiation with switching outputFor example Radiation alarm monitorUse in builder
BSSensing frequency, speed, rotational speed and accelerationUse in builder
BSAFrequency and cycle rate measurement with measured value outputFor example Frequency transducerUse in builder
BSBFrequency and cycle rate monitoring with switching outputFor example Frequency relayUse in builder
BSCSpeed measurement with measured value outputFor example Radar speed sensor, Laser Doppler velocimeterUse in builder
BSDSpeed monitoring with switching outputFor example Speed monitorUse in builder
BSERotational speed measurement with measured value outputFor example Tachogenerator, Rotational speed sensor, Incremental encoder for speed sensingUse in builder
BSFRotational speed monitoring with switching outputFor example Rotational speed monitor, Standstill monitor, Slip monitorUse in builder
BSGAcceleration measurement with measured value outputFor example Accelerometer, Vibration sensor, SeismometerUse in builder
BSHShock and vibration detection with switching outputFor example Vibration switch, Shock sensorUse in builder
BTSensing temperatureUse in builder
BTATemperature measurement with measured value outputFor example Pt100 resistance thermometer, Thermocouple, Temperature transmitter, PyrometerUse in builder
BTBTemperature monitoring with switching outputFor example Thermostat, Bimetal temperature switch, Frost protection thermostatUse in builder
BUSensing several quantities in one deviceUse in builder
BUAMulti-quantity measurement with measured value outputFor example Multifunction meter, Power analyser, Combined temperature and humidity sensorUse in builder
BUBMulti-quantity monitoring with switching outputFor example Buchholz relay, Distance protection relay, Grid and plant protection relay, Phase monitoring relayUse in builder
BWSensing weight, force and torqueUse in builder
BWAWeight measurement with measured value outputFor example Load cell, Platform scale, Belt scaleUse in builder
BWBWeight monitoring with switching outputUse in builder
BWCForce measurement with measured value outputFor example Force transducer, Force measuring cell, Strain gaugeUse in builder
BWDForce monitoring with switching outputUse in builder
BWETorque measurement with measured value outputFor example Torque measuring shaft, Torque transducerUse in builder
BWFTorque monitoring with switching outputFor example Torque switch in valve actuatorUse in builder
BXSensing sound and imagesUse in builder
BXASound sensing with signal outputFor example Microphone, Sound level meterUse in builder
BXBSound detection with switching outputFor example Glass break detectorUse in builder
BXCImage capture with video signal outputFor example Surveillance camera, Industrial camera, PTZ cameraUse in builder
BXDImage recognition with switching outputFor example Vision sensor, Fingerprint scanner, Face recognition terminalUse in builder
BYReading stored informationUse in builder
BYAReading data carriers via electrical contactFor example Contact smart card readerUse in builder
BYBReading via electric or magnetic fieldsFor example RFID reader, NFC reader, Magnetic stripe card readerUse in builder
BYCOptical reading of stored informationFor example Barcode scanner, QR code reader, Data Matrix code readerUse in builder
BZSensing events and countsUse in builder
BZACounting events with count value outputFor example Pulse counter, Piece counterUse in builder
BZBDetecting single events with switching outputUse in builder
BZCDetecting people present with switching outputFor example Presence detectorUse in builder
BZDDetecting the presence of substances with switching outputFor example Leak sensor, Water detectorUse in builder

CStoring energy, materials and information29 letter codes

CStoring energy, materials and informationFor example Capacitor, Rechargeable battery, Tank, Memory cardUse in builder
CACapacitive energy storageFor example Capacitor, Capacitor bank, SupercapacitorUse in builder
CAACapacitor storing electric chargeFor example Electrolytic capacitor, Film capacitor, Ceramic capacitor, Power capacitorUse in builder
CBInductive energy storageFor example Storage choke, Air-core coil, Superconducting magnetic energy storageUse in builder
CBAInductor or chokeFor example Storage choke, Toroidal choke, Air-core coilUse in builder
CCElectrochemical energy storageFor example Accumulator, Battery storage system, Redox flow batteryUse in builder
CCARechargeable batteryFor example Lead-acid battery, Lithium-ion battery, Nickel-cadmium battery, Starter batteryUse in builder
CFStorage for data and informationFor example Hard disk drive, SSD, Memory cardUse in builder
CFAData carrier for storing informationFor example SD card, USB flash drive, DVD, Magnetic tapeUse in builder
CLFixed open receptacle for material and peopleUse in builder
CLAOpen basin for liquidsFor example Cistern, Pump sump, Fire water pond, Spill containment trayUse in builder
CLBShelf or tray for itemsFor example Shelf, Storage tray, Document pocketUse in builder
CLCSeating or lying furniture for peopleFor example Chair, Bench, Operator seat, CouchUse in builder
CMFixed closed container for materialUse in builder
CMAFixed tank for liquidsFor example Heating oil tank, Water tank, Storage tank, Feed tankUse in builder
CMBClosed box or bin for solidsFor example Silo, Storage box, Bulk material bunkerUse in builder
CNMovable container for material or peopleUse in builder
CNATransport container for solids or peopleFor example Transport box, Mesh pallet box, Elevator car, Bulk containerUse in builder
CNBPortable gas cylinderFor example Oxygen cylinder, Nitrogen cylinder, Propane cylinder, Compressed air cylinderUse in builder
CNCDrum or canister for liquidsFor example Oil drum, Jerrycan, IBC containerUse in builder
CPStorage for heat or coldFor example Buffer tank, Hot water storage tank, Ice storageUse in builder
CPAThermal storage with liquid mediumFor example Buffer tank, Hot water storage tank, Stratified storage tankUse in builder
CPBThermal storage with gaseous mediumUse in builder
CPCThermal storage with solid mediumFor example Gravel heat storage, Storage core of a night storage heaterUse in builder
CPDLatent heat storage with phase change materialFor example Ice storage, Paraffin storage, Salt hydrate storageUse in builder
CQMechanical energy storageFor example Flywheel, Spring energy store, CounterweightUse in builder
CQAFlywheel storing rotational energyFor example Flywheel disc, Flywheel energy storageUse in builder
CQBSpring storing elastic energyFor example Compression spring, Tension spring, Torsion spring, Stored-energy spring of a circuit breakerUse in builder
CQCCounterweight storing potential energyFor example Elevator counterweight, Barrier counterweightUse in builder

EEmitting light, heat, cold or radiation53 letter codes

EEmitting light, heat, cold or radiationFor example Luminaire, Enclosure heater, Enclosure cooling unitUse in builder
EAGenerating lightFor example High-bay luminaire, Control cabinet lightUse in builder
EAAElectrically powered light sourceFor example Control cabinet light, LED luminaire, Fluorescent lamp, Incandescent lampUse in builder
EABLight source with a gas flameFor example Gas lanternUse in builder
EACLight source burning liquid fuelFor example Kerosene lamp, Oil lampUse in builder
EBHeat generation from electrical energyFor example Enclosure heater, Immersion heaterUse in builder
EBAElectrically heated boiler for liquidsFor example Electric boiler, Electrode boiler, Instantaneous water heaterUse in builder
EBBElectrically heated surfaceFor example Heating mat, Heating foil, Electric underfloor heatingUse in builder
EBCElectric heating cableFor example Pipe trace heating, Gutter heating cable, Frost protection heating tapeUse in builder
EBDElectric fan heaterFor example Fan heater, Enclosure fan heater, Hot air gunUse in builder
EBEHeating by an electric arcFor example Electric arc furnaceUse in builder
EBFHeating by electromagnetic inductionFor example Induction furnace, Induction hob, Induction hardening unitUse in builder
EBGElectric infrared heaterFor example Infrared radiant heater, Infrared drying emitter, Infrared heating panelUse in builder
EBHElectrically heated ovenFor example Electric baking oven, Muffle furnace, Drying cabinetUse in builder
ECCooling generated from electrical energyFor example Enclosure cooling unitUse in builder
ECAElectrically cooled surfaceUse in builder
ECBFan unit with electric air coolingUse in builder
ECCElectrically driven refrigeration machine with compressorFor example Chiller, Enclosure cooling unit, Compressor cooling unitUse in builder
EEWireless transfer of energyFor example Inductive charging stationUse in builder
EEAEnergy transfer by inductive couplingFor example Inductive charging coil, Wireless charging padUse in builder
EEBEnergy transfer by microwavesFor example Magnetron, Microwave oven, Microwave drying systemUse in builder
EECSource of X-ray radiationFor example X-ray tube, X-ray generatorUse in builder
EEDSource of gamma radiationFor example Caesium-137 source, Cobalt-60 sourceUse in builder
EEEEnergy transfer by capacitive couplingUse in builder
EGDelivering heat or cold by heat transferFor example Heat pump, Heat exchangerUse in builder
EGAHeat transfer with a refrigerant cycleFor example Air-to-water heat pump, Brine-to-water heat pump, RefrigeratorUse in builder
EGBThermoelectric cooling or heating elementFor example Peltier element, Peltier enclosure cooler, Thermoelectric cool boxUse in builder
EGCHeat transfer between two media flowsFor example Plate heat exchanger, Shell-and-tube heat exchanger, Air-to-water heat exchangerUse in builder
EMHeat generation by combustionFor example Oil-fired boiler, Gas space heaterUse in builder
EMAFuel-fired space heatingFor example Wood stove, Tiled stove, Gas space heaterUse in builder
EMBFuel-fired boiler for liquidsFor example Gas condensing boiler, Oil-fired boiler, Steam boiler, Thermal oil boilerUse in builder
EMCHeating of solids by combustionFor example Gas hob, Gas grillUse in builder
EPHeat output via a heat transfer mediumFor example Radiator, Hot water underfloor heatingUse in builder
EPAPermeable heating surface supplied by a heat transfer mediumUse in builder
EPBHeat output via pipes carrying hot liquidFor example Heating coil, Steam heating pipeUse in builder
EPCHeat output via a closed heated surfaceFor example Panel radiator, Tubular radiatorUse in builder
EPDFan unit heated by a heat transfer mediumFor example Hot water unit heater, Hot water door air curtain, Fan coil unitUse in builder
EQCooling output via a coolant mediumFor example Chilled ceiling, Cooling coilUse in builder
EQAPermeable cooling surface supplied by a coolant mediumUse in builder
EQBClosed cooling surface supplied by a coolant mediumFor example Chilled ceiling panel, Water-cooled cold plateUse in builder
EQCFan cooler supplied by a coolant mediumFor example Air-to-water heat exchanger for enclosures, Recirculating air coolerUse in builder
EQDCooling of liquidsFor example Dry cooler, Oil cooler, Cooling towerUse in builder
EQECooling via pipes carrying coolantFor example Cooling coil, Cooling pipe registerUse in builder
ETHeat generation by nuclear fissionFor example Nuclear reactorUse in builder
ETANuclear reactor with boiling coolant waterFor example Boiling water reactorUse in builder
ETBNuclear reactor with pressurised waterFor example Pressurised water reactorUse in builder
ETCGas-cooled high-temperature nuclear reactorFor example Pebble bed reactorUse in builder
EUEmission of subatomic particlesUse in builder
EUAParticle source with ionisationFor example Plasma generator, Ion sourceUse in builder
EUBParticle source without ionisationFor example Neutron source, Beta radiation sourceUse in builder
EVEmission of sound wavesFor example Ultrasonic transducer, Anti-noise loudspeakerUse in builder
EVASound emission in the ultrasonic rangeFor example Sonar, Ultrasonic emitter, Ultrasonic cleaning transducerUse in builder
EVBAnti-noise for active noise controlFor example Anti-noise loudspeaker, ANC loudspeaker in ventilation ductsUse in builder

FProtective devices against hazards and faults59 letter codes

FProtective devices against hazards and faultsFor example Fuse, Surge arrester, Fire damperUse in builder
FAProtection against overvoltageFor example Lightning current arrester, Surge arrester, VaristorUse in builder
FAASpark gap arresterFor example Spark gap lightning current arrester, Gas discharge tubeUse in builder
FABVaristor-based surge arresterFor example Metal oxide varistor, Varistor protection moduleUse in builder
FACOvervoltage limiting with Zener diodeFor example Zener diodeUse in builder
FADArrester discharging overvoltagesFor example Surge arrester, Medium voltage surge arresterUse in builder
FBProtection against earth fault currentsFor example Residual current circuit breaker, Arc suppression coilUse in builder
FBAResidual current device (RCD)For example Type A residual current circuit breaker, Type B AC/DC sensitive residual current circuit breaker, Portable residual current device (PRCD)Use in builder
FBBEarth fault current limitationFor example Arc suppression coil, Neutral earthing resistor, Neutral earthing reactorUse in builder
FCProtection against overcurrentFor example Fuse, Miniature circuit breaker, Thermal overload relayUse in builder
FCAFuse with fuse linkFor example NH blade fuse, D0 fuse, Miniature fuse, Cylindrical fuseUse in builder
FCBMiniature circuit breaker (MCB)For example MCB B16, MCB C10Use in builder
FCCThermal overload protection with bimetalFor example Thermal overload relay, Bimetal overload release, Thermal cut-out switchUse in builder
FEProtection against electric and magnetic fieldsFor example Shielded enclosure, Mu-metal shieldUse in builder
FEAShielding against electric fieldsFor example Faraday cage, Shielding plateUse in builder
FEBShielding against magnetic fieldsFor example Mu-metal shield, Magnetically shielded roomUse in builder
FECShielding against electromagnetic fieldsFor example RF shielded cabin, EMC shielded enclosure, Shielding metal sheetsUse in builder
FLProtection against impermissible pressureFor example Safety valve, Bursting disc, Diaphragm expansion vesselUse in builder
FLAValve against excessive overpressureFor example Spring-loaded safety valve, Pressure relief valveUse in builder
FLBAir damper for pressure reliefFor example Overpressure damper, Pressure relief flapUse in builder
FLCProtection against vacuum in the systemFor example Vacuum breaker, Air admittance valveUse in builder
FLDRupture disc for one-time pressure reliefFor example Bursting disc, Rupture membraneUse in builder
FLEPressure compensation by absorbing volumeFor example Diaphragm expansion vessel, Expansion tankUse in builder
FMProtection against fire and smokeFor example Fire damper, Fire extinguisher, Fire protective coatingUse in builder
FMADamper closing air ducts in case of fireFor example Fire damper with fusible link, Fire damper with spring return actuatorUse in builder
FMBDamper controlling smoke in air ductsFor example Smoke extraction damper, Smoke control damperUse in builder
FMCCombined damper against fire and smokeFor example Fire damper with smoke detector releaseUse in builder
FMDManually operated extinguishing deviceFor example Powder extinguisher, CO2 extinguisher, Foam extinguisher, Fire blanketUse in builder
FMEClosure that shuts passages in case of fireFor example Fire-rated rolling shutter, Fire-rated sliding gateUse in builder
FMFCurtain forming smoke compartmentsFor example Smoke apron, Textile smoke curtainUse in builder
FMGPenetration seal against fire spreadFor example Cable fire stop, Fire protection collar, Fire stop pillow, Mortar fire sealUse in builder
FMHFire protective cladding of surfacesFor example Fire protection board, Mineral wool fire protection matUse in builder
FMJFire protective surface coatingFor example Intumescent coating, Fire protective paint, Cable fire protection coatingUse in builder
FMKFlame retardance by impregnationFor example Fire retardant wood impregnation, Flame retardant textile treatmentUse in builder
FNProtection against mechanical forcesFor example Slip clutch, Impact protection padUse in builder
FNACoupling disengaging at excessive torqueFor example Slip clutch, Overload clutch, Shear pin couplingUse in builder
FNBCushioning protection against impactFor example Impact protection pad, Edge protection profile, Cable protection hoseUse in builder
FQPreventive protection by physical barriersFor example Protective grille, Railing, Splash guardUse in builder
FQANet or grille against moving itemsFor example Safety net, Protective grille, Ball stop netUse in builder
FQBProtection against sliding material such as snowFor example Snow guard grille, Snow stopperUse in builder
FQCFall protection by railingFor example Stair railing, Handrail, Parapet railingUse in builder
FQDProtection against falling out or collisionFor example Crash barrier, Protective canopy, Impact protection railUse in builder
FQEProtective material against mechanical penetrationUse in builder
FQFProtection against glareFor example Anti-glare screen, Anti-glare fence, Anti-glare paneUse in builder
FQGProtection against splashesFor example Splash guard wall, Splash guard hood, Splash guard plateUse in builder
FQHProtection against damage by personsFor example Vandal-proof housing, Luminaire protection basketUse in builder
FQJLock against unauthorized unlockingFor example Hatch lock, PadlockUse in builder
FRProtection against wear and abrasionFor example Lubricating oil, Wear plateUse in builder
FRALubrication with liquid lubricantFor example Lubricating oil, Drip oiler, Oil mist lubricationUse in builder
FRBSolid separating layer against wearFor example Wear plate, Sliding lining, Solid lubricantUse in builder
FSProtection against environmental influencesFor example Protective paint, Weather protection roof, Sacrificial anodeUse in builder
FSAProtective layer of plaster or mortarFor example Plaster, Cement render, Mortar layerUse in builder
FSBProtective paint or lacquer coatingFor example Protective lacquer, Clear coat, Electrical insulating varnishUse in builder
FSCImpregnation against weathering and decayFor example Wood preservative impregnation, Water-repellent treatment of masonryUse in builder
FSDStructural shelter against weatherFor example Weather protection roof, Shed, Avalanche galleryUse in builder
FSESeismic vibration controlFor example Seismic isolator, Tuned mass damperUse in builder
FSFCorrosion protection of metalFor example Sacrificial anode, Impressed current cathodic protection systemUse in builder
FSGProtective surface sealingFor example Concrete sealer, Epoxy floor sealingUse in builder
FSHSeparating layer against capillary moistureFor example Damp-proof course, Capillary-breaking gravel layerUse in builder

GGenerating a flow of energy, material or signals40 letter codes

GGenerating a flow of energy, material or signalsUse in builder
GAGenerating electricity from mechanical energyUse in builder
GAAGenerating alternating current from rotationFor example Synchronous generator, Asynchronous generator, Three-phase generatorUse in builder
GABGenerating direct current from rotationFor example DC generator, DynamoUse in builder
GBGenerating electricity from chemical energyUse in builder
GBABattery with a limited chemical energy storeFor example Primary battery, Button cellUse in builder
GBBGenerating electricity from continuously supplied fuelFor example Hydrogen fuel cell, PEM fuel cell, Solid oxide fuel cellUse in builder
GCGenerating electricity from sunlightUse in builder
GCAPhotovoltaic module with crystalline cellsFor example Monocrystalline PV module, Polycrystalline PV moduleUse in builder
GCBThin-film photovoltaic moduleFor example CIGS module, CdTe module, Amorphous silicon moduleUse in builder
GFGenerating signals for transmitting informationUse in builder
GFATransmitting via electromagnetic wavesFor example Radio transmitter, Broadcast transmitter, Laser transmitterUse in builder
GFBSignal generation over wiresFor example Function generator, Clock generatorUse in builder
GLContinuous conveying of goods or peopleUse in builder
GLAConveying with a moving beltFor example Conveyor belt, Troughed belt conveyorUse in builder
GLBConveying with a circulating chainFor example Chain conveyor, Scraper conveyor, Slat conveyorUse in builder
GLCConveying on rollersFor example Roller conveyor, Accumulating roller conveyorUse in builder
GLDConveying with a rotating screwFor example Screw conveyor, Dosing screwUse in builder
GLEPassenger transport on circulating stepsFor example EscalatorUse in builder
GLFContinuous transport in circulating cabins or containersFor example Paternoster lift, Bucket elevatorUse in builder
GLGContinuous conveying via a vibrating surfaceFor example Vibrating trough conveyorUse in builder
GMDiscontinuous conveying of loads or peopleUse in builder
GMAHorizontal movement of loadsFor example Transfer car, Automated guided vehicleUse in builder
GMBVertical lifting and lowering of loads or peopleFor example Passenger lift, Goods lift, Lifting tableUse in builder
GMCLifting and moving loads in several directionsFor example Overhead crane, Gantry crane, Tower craneUse in builder
GMDStacking and arranging unit loadsFor example Palletiser, DepalletiserUse in builder
GMERotating conveyed goods to change directionFor example Turntable, Pallet turntableUse in builder
GMFIntermittent conveying by vibrationUse in builder
GPGenerating a liquid flowUse in builder
GPAPositive displacement pumpFor example Piston pump, Gear pump, Peristaltic pump, Progressive cavity pumpUse in builder
GPBRotodynamic pump with rotating impellerFor example Centrifugal pump, Circulation pump, Axial flow pump, Submersible pumpUse in builder
GPCLiquid delivery by a motive jetFor example Jet pump, Ejector, InjectorUse in builder
GPDGravity-fed liquid supplyFor example Drip oilerUse in builder
GQGenerating a gas flowUse in builder
GQACompressing gas by positive displacementFor example Piston compressor, Screw compressor, Scroll compressorUse in builder
GQBMoving gas with rotating bladesFor example Axial fan, Centrifugal fan, Enclosure fan, Door air curtainUse in builder
GQCGas delivery by a motive jetFor example Vacuum ejector, Steam jet compressorUse in builder
GRGenerating heat from solar energyUse in builder
GRASolar collector heating a carrier fluidFor example Flat plate collector, Evacuated tube collectorUse in builder
GRBSolar tower with concentrated sunlightUse in builder

HProcessing and treating materials43 letter codes

HProcessing and treating materialsFor example Mixer, Dryer, Centrifuge, Welding machineUse in builder
HJPrimary forming from shapeless materialFor example Die casting machine, Injection moulding machine, Sintering pressUse in builder
HJACasting from liquid materialFor example Die casting machine, Injection moulding machine, Permanent mouldUse in builder
HJBPressing from solid or powdered materialFor example Powder press, Sintering press, Board pressUse in builder
HKSurface treatmentFor example Parts washer, Grinding machine, Painting lineUse in builder
HKACleaning and preparing surfacesFor example Parts washer, Ultrasonic cleaner, Industrial vacuum cleaner, Degreasing systemUse in builder
HKBChanging surface propertiesFor example Polishing machine, Belt sander, Shot peening machineUse in builder
HKCCoating surfacesFor example Painting line, Powder coating system, Electroplating line, Paint spray gunUse in builder
HLJoining and assembling partsFor example Assembly robot, Crimping machine, Welding machine, Gluing machineUse in builder
HLARobot for assembly tasksFor example Component placement machine, Pick-and-place robot, Screwdriving robotUse in builder
HLBMechanical joining of partsFor example Crimping machine, Riveting machine, Press-fit machine, Clinching toolUse in builder
HLCWelding and solderingFor example Arc welding machine, Soldering station, Wave soldering machine, Spot welding gunUse in builder
HLDBonding and chemical joiningFor example Gluing machine, Adhesive dispensing systemUse in builder
HMSeparating mixtures by gravity or centrifugal forceFor example Settling tank, Centrifuge, Cyclone separatorUse in builder
HMASeparation by settling under gravityFor example Settling tank, Grit chamber, Oil separator, Primary clarifierUse in builder
HMBCentrifuge with rotating drumFor example Decanter centrifuge, Disc stack separator, Laboratory centrifugeUse in builder
HMCCyclone with stationary housingFor example Hydrocyclone, Cyclone separator, Centrifugal dust collectorUse in builder
HPSeparating mixtures by heatFor example Dryer, Evaporator, Distillation columnUse in builder
HPADryer for removing moistureFor example Belt dryer, Drum dryer, Spray dryer, Refrigerated dryerUse in builder
HPBEvaporating and distilling liquidsFor example Distillation column, Rectification column, Falling film evaporatorUse in builder
HQSeparating mixtures mechanicallyFor example Screening machine, Bag filter, Oil skimmerUse in builder
HQASkimming substances off liquid surfacesFor example Oil skimmer, Scum skimmerUse in builder
HQBScreening and filtering by particle sizeFor example Screening machine, Bar screen, Bag filter, Air filterUse in builder
HRSeparation by electric or magnetic fieldsFor example Electrostatic precipitator, Magnetic separatorUse in builder
HRASeparation in an electric fieldFor example Electrostatic precipitator, Electrostatic oil mist separatorUse in builder
HRBSeparation with a magnetic fieldFor example Overband magnet, Magnetic drum, Magnetic filterUse in builder
HSSeparating mixtures chemicallyFor example Ion exchanger, Gas scrubber, Activated carbon filterUse in builder
HSASeparation by ion exchangeFor example Water softener, Demineralisation plant, Mixed bed filterUse in builder
HSBSeparation by absorptionFor example Gas scrubber, Absorption columnUse in builder
HSCSeparation by adsorptionFor example Activated carbon filter, Molecular sieveUse in builder
HUCrushing and grinding solidsFor example Shredder, Ball mill, Jaw crusherUse in builder
HUACutting and shredding materialFor example Shredder, Chipper, Paper shredderUse in builder
HUBGrinding to a defined particle sizeFor example Ball mill, Hammer mill, Grain millUse in builder
HUCCrushing rockFor example Jaw crusher, Cone crusher, Impact crusherUse in builder
HVAgglomerating particles into larger unitsFor example Pellet press, Flocculation tankUse in builder
HVAPelletising materialFor example Pellet press, Pelletising disc, Pelletising drumUse in builder
HVBFlocculation of colloidsFor example Flocculation tankUse in builder
HWMixing different substancesFor example Mixer, Agitator, HumidifierUse in builder
HWAMixer and agitatorFor example Agitator, Kneading machine, Concrete mixer, Static mixerUse in builder
HWBHumidifying air or gasesFor example Air humidifier, Steam humidifier, Spray humidifierUse in builder
HXChemical or biological conversion of substancesFor example Stirred tank reactor, FermenterUse in builder
HXAReactor for chemical processesFor example Stirred tank reactor, Tubular reactor, GasifierUse in builder
HXBBioreactor for biological processesFor example Fermenter, Biogas digester, Aeration tankUse in builder

KProcessing of signals and information26 letter codes

KProcessing of signals and informationFor example PLC, Relay, Industrial PCUse in builder
KEProcessing of electrical signalsFor example PLC, Industrial PCUse in builder
KEAComputer operated by peopleFor example Industrial PC, Panel PC, Laptop, TabletUse in builder
KEBAutomatic controller without an operatorFor example PLC, Safety controller, Remote terminal unit, Synchronising deviceUse in builder
KECCommunication and I/O modulesFor example I/O module, Fieldbus coupler, Ethernet interface card, Communication moduleUse in builder
KEDForwarding of data between networksFor example Router, Gateway, Firewall, Protocol converterUse in builder
KEEWriting data to storage mediaFor example DVD burner, Memory card writer, Tape driveUse in builder
KFPassing on electrical signalsFor example Coupling relay, Time relay, Network switchUse in builder
KFAPassing on electrical signals without delayFor example Coupling relay, Contactor relay, Plug-in relay, OptocouplerUse in builder
KFBPassing on electrical signals with a time delayFor example Time relay, On-delay relay, Off-delay relayUse in builder
KFCPassing on electrical signals with amplificationFor example Repeater, PROFIBUS repeater, RS-485 repeaterUse in builder
KFDCoupling of network segmentsFor example Network bridge, Wireless LAN bridgeUse in builder
KFETargeted distribution of data within a networkFor example Ethernet switch, Managed switch, Industrial switchUse in builder
KGProcessing of optical signalsFor example Fibre optic switchUse in builder
KGATargeted distribution of data in a fibre networkFor example Optical switch, Fibre optic switchUse in builder
KGBOptical forwarding between data networksFor example Optical routerUse in builder
KGCAmplification of optical signalsFor example Optical repeater, Fibre optic repeater, Fibre amplifierUse in builder
KHProcessing of pneumatic and hydraulic signalsFor example Pneumatic controller, Pilot valveUse in builder
KHAFluidic closed-loop controlFor example Pneumatic controller, Hydraulic controllerUse in builder
KHBPassing on fluidic control signalsFor example Pilot valve, Pneumatic AND valve, Pneumatic time delay valveUse in builder
KJProcessing of mechanical signalsFor example Centrifugal governor, Lock cylinderUse in builder
KJAMechanical control of gas or liquid flowsFor example Pressure reducer, Pressure control valve, Flow regulatorUse in builder
KJBMechanical locking and unlocking of a lockFor example Lock cylinder, Euro profile cylinderUse in builder
KJCMechanical coding of a device stateUse in builder
KZProcessing of several signal typesUse in builder
KZATargeted routing of several signal typesUse in builder

MDrives for motion and force29 letter codes

MDrives for motion and forceUse in builder
MAElectromagnetic rotary driveUse in builder
MAAElectric motor for continuous rotationFor example Three-phase induction motor, Synchronous motor, Servo motor, DC motorUse in builder
MABElectric motor for stepwise rotationFor example Stepper motor, Hybrid stepper motorUse in builder
MBElectromagnetic linear driveUse in builder
MBAElectric drive for continuous linear motionFor example Linear motor, Tubular linear motorUse in builder
MBBElectromagnet for switching stroke motionFor example Solenoid actuator, Valve solenoid coil, Brake release solenoidUse in builder
MCDrive by magnetic forceUse in builder
MCAPermanent magnet as force sourceFor example Permanent holding magnetUse in builder
MDPiezoelectric driveUse in builder
MDADrive using a piezo crystalFor example Piezo actuator, Piezo motor, Ultrasonic motorUse in builder
MLDrive from stored or flowing mechanical energyUse in builder
MLADrive by gravityFor example Falling weight driveUse in builder
MLBDrive by spring forceFor example Stored energy spring mechanismUse in builder
MLCRotor harnessing wind energyFor example Wind turbineUse in builder
MLDTurbine harnessing hydropowerFor example Kaplan turbine, Francis turbine, Pelton turbineUse in builder
MLETurbine driven by flowing or expanding gasFor example Gas turbine, Expansion turbineUse in builder
MMFluid power drive using hydraulics or pneumaticsUse in builder
MMAHydraulic linear actuatorFor example Hydraulic cylinder, Differential cylinder, Plunger cylinderUse in builder
MMBPneumatic linear actuatorFor example Pneumatic cylinder, Compact cylinder, Rodless cylinderUse in builder
MMCHydraulic rotary driveFor example Hydraulic motor, Axial piston motor, Hydraulic gear motorUse in builder
MMDPneumatic rotary driveFor example Air motor, Vane air motorUse in builder
MSCombustion engines of all typesUse in builder
MSAReciprocating engine with spark ignitionFor example Petrol engine, Gas engine of a CHP unitUse in builder
MSBReciprocating engine with compression ignitionFor example Diesel engine, Marine diesel engineUse in builder
MSCRotary piston engine with spark ignitionFor example Wankel engineUse in builder
MTDrive by external heat supplyUse in builder
MTAPiston engine driven by steamFor example Reciprocating steam engineUse in builder
MTBHot gas engine with heated and cooled cylinderFor example Stirling engineUse in builder

NCovering wholly or partly33 letter codes

NCovering wholly or partlyFor example Cover, Control cabinet door, CladdingUse in builder
NAFilling openingsFor example Glass pane, Blanking cover, Sealing compoundUse in builder
NAALight-transmitting infill of an openingFor example Glass pane, Inspection window, Acrylic glass paneUse in builder
NABOpaque closed infill panelFor example Blank plate, Blanking cover, Infill panelUse in builder
NACInfill letting air or water throughFor example Ventilation grille, Weather louvre, Perforated sheet coverUse in builder
NADSealing an opening against fluidsFor example Gasket, Sealing compound, Blanking plug, Fire protection mortarUse in builder
NBClosable cover for an openingFor example Door, Flap, GateUse in builder
NBAMovable door leafFor example Hinged door, Sliding door, Fire doorUse in builder
NBBMovable leaf of a large door openingFor example Sectional door, Roller shutter door, Hangar doorUse in builder
NBCFlap or door on an enclosureFor example Control cabinet door, Enclosure door, Access hatchUse in builder
NBDLeaf of a gate in a fence or drivewayFor example Sliding gate, Swing gate, Fence gateUse in builder
NBEClosure of a hatchFor example Roof hatch, Floor hatch, Manhole coverUse in builder
NCSurface finishes and claddingsFor example Floor covering, Wall cladding, Roof coveringUse in builder
NCAPaving for footpathsFor example Paving stones, Paving slabs, Asphalt surfacingUse in builder
NCBSurface finish of a wallFor example Wall tiles, Plaster, Wall panelsUse in builder
NCCSurface finish of a floorFor example Floor tiles, Parquet, Linoleum, Epoxy resin coatingUse in builder
NCDSurface finish of a ceilingFor example Ceiling plaster, Acoustic panels, Ceiling panelsUse in builder
NCECovering of a roofFor example Roof tiles, Trapezoidal sheet, Roofing membraneUse in builder
NCFFinish at window openingsFor example Window sill, Exterior window sillUse in builder
NCGVegetated surface layerFor example Turf rolls, Green roof mat, Sedum matUse in builder
NCHOuter shaping by cladding partsFor example Car body panel, Machine cladding, Aircraft fairingUse in builder
NDEdge finish of building elementsFor example Kerbstone, Edge profileUse in builder
NDAEdging for footpaths and planted bedsFor example Kerbstone, Lawn edging stone, Bed edgingUse in builder
NDBTop finish of a wallFor example Wall coping, Coping stoneUse in builder
NDCEdge finish of a floorFor example Floor edge trimUse in builder
NDDEdge finish of a ceilingFor example Ceiling edge trimUse in builder
NDEEdge finish of a roofFor example Verge board, Fascia board, Roof edge profileUse in builder
NEConcealing joints between building elementsFor example Joint profile, Cover stripUse in builder
NEACover where wall meets ceilingFor example Ceiling trim, Cornice moulding, Cove mouldingUse in builder
NEBCover where wall meets floorFor example Skirting board, Coved skirtingUse in builder
NECCover at the corner between two wallsFor example Corner guard, Corner trimUse in builder
NEDCover for joints on the roofFor example Roof flashing, Chimney flashing, Ridge flashingUse in builder
NEESurround around an openingFor example Door casing, Window surround, Pipe escutcheonUse in builder

PMaking information visible, audible or tangible50 letter codes

PMaking information visible, audible or tangibleFor example Indicator light, Measuring instrument, Display screen, HornUse in builder
PFVisual indication of statesFor example Indicator light, Signal tower, Mechanical switch position indicatorUse in builder
PFAIndicator light showing statesFor example Pilot light, LED signal lamp, Signal tower, Traffic lightUse in builder
PFBState indication by mechanical positionFor example Switch position indicator on a circuit breaker, Valve position indicator, Drop flag indicatorUse in builder
PGDisplay of a single measured valueFor example Voltmeter, Pressure gauge, Thermometer, Electricity meterUse in builder
PGAVoltmeter showing voltageFor example Panel voltmeter, Digital panel-mount voltmeterUse in builder
PGBIndicator for resistance and conductivityFor example Ohmmeter, Insulation tester, Conductivity displayUse in builder
PGCAmmeter showing currentFor example Panel ammeter, Digital current displayUse in builder
PGDDensity indicator for a mediumFor example SF6 gas density indicator, HydrometerUse in builder
PGEIndicator for a field quantityFor example Teslameter, Field strength meterUse in builder
PGFFlow indicatorFor example Variable area flowmeter, Sight flow indicatorUse in builder
PGGIndicator for position, distance or angleFor example Handwheel position indicator, Inclination indicator, Axis position displayUse in builder
PGHMeter for consumed or supplied energyFor example Electricity meter, Three-phase meter, Heat meter, Reactive energy meterUse in builder
PGJElectrical power indicatorFor example Wattmeter, VarmeterUse in builder
PGKClock or time displayFor example Wall clock, Radio-controlled clock, Digital time displayUse in builder
PGLLevel indicatorFor example Sight glass, Magnetic level indicator, Oil level indicatorUse in builder
PGMHumidity indicatorFor example Hygrometer, Thermo-hygrometerUse in builder
PGPPressure indicatorFor example Bourdon tube pressure gauge, Differential pressure gauge, Vacuum gauge, BarometerUse in builder
PGQIndicator for substance concentrationFor example pH meter, CO2 display, Oxygen displayUse in builder
PGRRadiation indicatorFor example Lux meter, UV meter, Radiation dosimeterUse in builder
PGSFrequency indicatorFor example Vibrating reed frequency meter, Digital frequency meterUse in builder
PGTTemperature indicatorFor example Dial thermometer, Bimetal thermometer, Digital temperature displayUse in builder
PGVPower factor indicatorFor example Power factor meterUse in builder
PGWWeight, force and torque indicatorFor example Weighing terminal, Spring balance, Crane scaleUse in builder
PGXSound and sound level indicatorFor example Sound level meter, Noise level displayUse in builder
PGZCounter for quantities or eventsFor example Piece counter, Pulse counter, Operations counterUse in builder
PHGraphical or written presentation of informationFor example Screen, Printer, SignUse in builder
PHADisplay surface with changing contentFor example Monitor, LCD text display, LED ticker display, Large-scale displayUse in builder
PHBProjecting images onto a distant surfaceFor example Video projector, Laser projectorUse in builder
PHCOutput on paper or labelsFor example Label printer, Laser printer, Log printer, PlotterUse in builder
PHDFixed panel with symbols or textFor example Warning sign, Information sign, Escape route signUse in builder
PHELettering or marking applied directly to a componentFor example Floor marking, Engraving, Colour coding of pipelines, StickerUse in builder
PHFMarker by shape or locationFor example Delineator post, Survey point, Boundary stoneUse in builder
PJAudible output of informationFor example Horn, Buzzer, Loudspeaker, SirenUse in builder
PJASound output via a vibrating diaphragmFor example Ceiling loudspeaker, Horn loudspeaker, Public address loudspeakerUse in builder
PJBHorn or siren using an air streamFor example Air horn, Motor siren, Steam whistleUse in builder
PJCBell or chime with mechanical strikingFor example Alarm bell, Gong, Church bellUse in builder
PKTactile output of informationFor example Vibration alert, BrailleUse in builder
PKASignalling by vibrationFor example Vibration alert, Vibrating alarm clockUse in builder
PKBPermanent tactile informationFor example Braille sign, Tactile paving, Rumble stripUse in builder
PKCTactile warning of limited headroomUse in builder
PLDecorative and design elementsUse in builder
PLADecorative element separating two areasFor example Cornice, Decorative mouldingUse in builder
PLBThree-dimensional decorative representationFor example Sculpture, Statue, BustUse in builder
PLCRaised wall decorationFor example Stucco moulding, Wall relief, PilasterUse in builder
PLDPictorial representation on a surfaceFor example Painting, Photograph, MuralUse in builder
PLEDecorative textile coveringFor example Runner, Tapestry, TableclothUse in builder
PZOutput for several senses at onceFor example Combined visual and audible signal device, Television setUse in builder
PZAVisual and audible alarm deviceFor example Strobe beacon with siren, Signal tower with buzzer, Combined sounder beaconUse in builder
PZBDevice presenting picture and soundFor example Television set, Information terminal with picture and soundUse in builder

QEnabling, blocking or regulating flow and access37 letter codes

QEnabling, blocking or regulating flow and accessFor example Contactor, Circuit breaker, Valve, DoorUse in builder
QASwitching electric current in a circuitFor example Contactor, Circuit breaker, Thyristor power controllerUse in builder
QAAContactor for operational switchingFor example Power contactor, Modular installation contactor, Reversing contactor combination, Star-delta contactor combinationUse in builder
QABCircuit breaker for normal and fault conditionsFor example Circuit breaker, Moulded case circuit breaker, Motor protection circuit breakerUse in builder
QACElectronic switch for load currentFor example Solid-state contactor, Solid-state relay, Soft starter, Thyristor power controllerUse in builder
QBIsolating electric circuitsFor example Main switch, Switch disconnector, Fuse switch disconnectorUse in builder
QBADisconnector without built-in fuseFor example Switch disconnector, Main switch, Maintenance switchUse in builder
QBBDisconnector with built-in fuseFor example Fuse switch disconnector, In-line fuse switch disconnector, Switch disconnector with fusesUse in builder
QCEarthing electric circuitsFor example Earthing switch, Portable earthing and short-circuiting deviceUse in builder
QCASwitch for earthing circuitsFor example Earthing switch in medium-voltage switchgear, Make-proof earthing switchUse in builder
QMShutting off media in closed linesFor example Ball valve, Butterfly shut-off valve, Solenoid valveUse in builder
QMAShut-off valve for liquidsFor example Ball valve, Gate valve, Solenoid valve for waterUse in builder
QMBShut-off valve for gases and airFor example Gas ball valve, Shut-off damper in ventilation ducts, Compressed air shut-off valveUse in builder
QNRegulating flow in closed linesFor example Control valve, Control damperUse in builder
QNAControl valve for liquidsFor example Control valve, Throttle valve, Three-way mixing valveUse in builder
QNBControl valve or damper for gases and airFor example Control damper, Butterfly throttle valve, Gas control valveUse in builder
QPDirecting and regulating open flowsUse in builder
QPAGate for open watercoursesFor example Weir gate, Vertical lift gate, Flap gateUse in builder
QPBFixed elements for guiding flowsFor example Flow baffle, Vortex generator, Fixed guide vaneUse in builder
QPCAdjustable elements for guiding flowsFor example Ship rudder, Aircraft rudderUse in builder
QQOpenings and closures for access to spacesFor example Door, Gate, Window, HatchUse in builder
QQAWindow for daylight onlyFor example Fixed glazing, Skylight, Rooflight domeUse in builder
QQBWindow for light and passageFor example French window, Roof access windowUse in builder
QQCDoor for people to pass throughFor example Hinged door, Sliding door, Swing door, Revolving doorUse in builder
QQDSmall opening for people and goodsFor example Roof hatch, Floor hatch, Manhole coverUse in builder
QQELarge door for vehicles and goodsFor example Roller door, Sectional door, High-speed door, Hangar doorUse in builder
QQFGate or passage with partial closureFor example Fence gate, Yard gate, Garden gateUse in builder
QQGBarrier preventing travel onto a trackFor example DerailerUse in builder
QRMetering and shutting off solid materialsFor example Rotary valve, Flap valve, Slide gate for bulk materialUse in builder
QRARotary valve with rotating pocketsFor example Rotary feeder, Blow-through rotary valveUse in builder
QRBBulk material closure with iris diaphragmFor example Iris diaphragm valve at a silo outletUse in builder
QRCBulk material closure with flap or discFor example Flap valve, Double flap valve, Butterfly valve for bulk materialUse in builder
QSBlocking or diverting mechanical motionFor example Door lock, Railway switchUse in builder
QSALock or bolt preventing motionFor example Door lock, Padlock, BoltUse in builder
QSBSwitch for changing between tracksFor example Railway switch, Tram switch, Monorail switchUse in builder
QZCombined switching functions in circuitsUse in builder
QZASwitch for isolating and earthingFor example Three-position switch, Disconnector with earthing switchUse in builder

RRestricting or steadying flows and motion45 letter codes

RRestricting or steadying flows and motionFor example Resistor, Check valve, BrakeUse in builder
RAComponents limiting electric currentFor example Resistor, Reactor, DiodeUse in builder
RAADiode blocking one current directionFor example Rectifier diode, Freewheeling diode, Decoupling diodeUse in builder
RABReactor or inductor in a circuitFor example Line reactor, Motor choke, Current limiting reactor, Smoothing chokeUse in builder
RACResistor componentFor example Braking resistor, Series resistor, Terminating resistor, Load resistorUse in builder
RBStabilizing the electrical supplyFor example UPS, Mains filter, Power factor correction systemUse in builder
RBAUninterruptible power supply (UPS)For example Online UPS, 24 V DC UPS, Buffer moduleUse in builder
RBBFilter for unwanted frequencies in the supplyFor example Mains filter, Sine wave filter, Passive harmonic filter, du/dt filterUse in builder
RBCReactive power compensation in the gridFor example Power factor correction system, Capacitor bank, Detuned power factor correction system, Static VAR compensatorUse in builder
RBDBalancing several frequency ranges in power flowUse in builder
RFSignal stabilizationFor example Signal filter, Ferrite core, EqualizerUse in builder
RFAFrequency response equalization for signalsFor example Equalizer, Line equalizerUse in builder
RFBFilter for frequency ranges of a signalFor example Ferrite core, Low-pass filter, Band-pass filter, Interference filter for signal linesUse in builder
RLRestricting or slowing down movementFor example Shock absorber, Brake, Safety catch ropeUse in builder
RLAChain or rope restricting movementFor example Door chain, Safety catch rope, Safety chainUse in builder
RLBDamping of movement and shocksFor example Industrial shock absorber, Gas spring damper, Rubber bufferUse in builder
RLCBrake for slowing or stoppingFor example Spring-applied brake, Motor holding brake, Disc brake, Eddy current brakeUse in builder
RLDLimiting the speed of moving objectsFor example Speed bump, Throttle check valveUse in builder
RMBarrier against backflow of substancesFor example Check valve, Non-return damper, Siphon trapUse in builder
RMABackflow preventer for liquidsFor example Check valve, Backflow preventer, Foot valveUse in builder
RMBNon-return damper for air and gasesFor example Non-return damper, Backdraft shutter, Gas check valveUse in builder
RMCNon-return flap for bulk solidsFor example Pendulum flapUse in builder
RMDOdour trap against sewer gasesFor example Siphon trap, Floor drain with odour trap, Tubular trapUse in builder
RNAdjusting or throttling flows of matterFor example Control valve, Throttle damper, Restriction orificeUse in builder
RNAAdjustable throttling of liquidsFor example Control valve, Throttle valve, Balancing valveUse in builder
RNBAdjustable throttling of air and gasesFor example Control damper, Throttle damper in air duct, Adjustable air outletUse in builder
RNCAdjustable metering of bulk solidsFor example Metering gateUse in builder
RNDFixed flow restrictionFor example Restriction orifice, Orifice plate, Fixed nozzle, Swirl diffuserUse in builder
RQShielding against heat, sound, light and weatherFor example Thermal insulation, Noise barrier, Venetian blindUse in builder
RQAThermal or acoustic insulationFor example Thermal insulation, Pipe insulation, Sound insulation mat, Refractory liningUse in builder
RQBMembrane against moisture, wind or passage of matterFor example Vapour barrier, Vapour retarder, Roofing underlayUse in builder
RQCNoise shieldingFor example Noise barrier, Sound barrier wall, Acoustic enclosureUse in builder
RQDScreen against wind, rain or radiationFor example Windbreak wall, Weather louvre, Sun shade panelUse in builder
RQETextile protection against incoming lightFor example Curtain, Blackout curtain, Roller blind, AwningUse in builder
RQFSlatted blind for light controlFor example Interior venetian blind, External venetian blindUse in builder
RQGExternal window cover against lightFor example Window shutter, Roller shutter, Hinged shutter, Sliding shutterUse in builder
RQHGround cover against weedsFor example Weed control fabric, Mulch film, Bark mulch layerUse in builder
RQJScreen against view and soundFor example Privacy fence, Acoustic partition screenUse in builder
RUBarriers against unauthorized accessFor example Fence, Boom barrier, Turnstile, BollardUse in builder
RUAFence as continuous barrierFor example Chain-link fence, Twin wire mesh fence, Pasture fenceUse in builder
RUBBarrier with movable boomFor example Car park barrier, Railway crossing barrier, Boom gate systemUse in builder
RUCRotating access barrierFor example Tripod turnstile, Full-height turnstileUse in builder
RUDPoint barrier against passageFor example Bollard, Removable barrier post, Retractable bollardUse in builder
RUEBarrier against animalsFor example Rat guard, Cattle gridUse in builder
RUFBarrier net against animalsFor example Bird protection net, Pigeon deterrent netUse in builder

SDetecting actions of human operators23 letter codes

SDetecting actions of human operatorsFor example Push button, Emergency stop button, Selector switch, Operator panelUse in builder
SFOperation via the faceFor example Eye tracker, Face recognition terminalUse in builder
SFADetection of eye and facial movementsFor example Eye tracker, Gaze controlUse in builder
SFBDevice for recognizing facesFor example Face recognition terminal, 3D face scannerUse in builder
SGOperation by handFor example Rotary knob, Emergency stop mushroom button, Key switchUse in builder
SGAHand-operated rotary controlFor example Rotary knob, Rotary selector switch, Setpoint potentiometerUse in builder
SGBHand-operated grip controlFor example Three-position enabling switch, Dead man's gripUse in builder
SGCHand-operated push controlFor example Emergency stop mushroom button, Palm button, Two-hand controlUse in builder
SGDHand lever for actuationFor example Control lever, Master controllerUse in builder
SGEPull-operated controlFor example Emergency stop pull-wire switch, Pull handleUse in builder
SGFKey for lock or key switchFor example Key switch, Control cabinet key, Double-bit keyUse in builder
SHOperation by footFor example Foot switch, Foot pedal switchUse in builder
SHAFoot switch or foot pedalFor example Foot switch, Guarded foot pedal, Three-position foot switchUse in builder
SJOperation by fingerFor example Push button, Toggle switch, TouchpadUse in builder
SJAFinger-operated toggle switchFor example Toggle switch, Rocker switchUse in builder
SJBKey or push buttonFor example Push button, Illuminated push button, KeyboardUse in builder
SJCTouch-sensitive controlFor example Touchpad, Capacitive touch keyUse in builder
SJDWheel turned by fingerFor example Scroll wheel, Thumbwheel switchUse in builder
SKInput by moving or positioningFor example Joystick, Computer mouseUse in builder
SKAControl stick with limited range of motionFor example Joystick, Crane joystick, TrackballUse in builder
SKBPointing device with free positioningFor example Computer mouse, Light pen, Graphics tablet penUse in builder
SZOperation with several controlsFor example Operator desk, Handheld control unitUse in builder
SZAControl panel with several manual controlsFor example Operator desk, Robot teach pendant, GamepadUse in builder

TConverting energy, signals and matter39 letter codes

TConverting energy, signals and matterFor example Transformer, Frequency converter, GearboxUse in builder
TAConverting electrical energy, same type of currentFor example Transformer, Frequency converter, DC/DC converterUse in builder
TAAAC transformerFor example Distribution transformer, Isolating transformer, Control transformer, AutotransformerUse in builder
TABDC to DC converterFor example DC/DC converter, Boost converter, Buck converterUse in builder
TACAC frequency converterFor example Frequency inverter for three-phase motors, Matrix converterUse in builder
TADShifting the phase angle in AC systemsFor example Phase-shifting transformer, Quadrature boosterUse in builder
TBConverting between AC and DCFor example Rectifier, Inverter, Power supply unitUse in builder
TBARectifier from AC to DCFor example 24 V DC power supply, Rectifier, Battery chargerUse in builder
TBBInverter from DC to ACFor example Photovoltaic inverter, Off-grid inverter, Sine wave inverterUse in builder
TBCConverter between AC and DC in both directionsFor example Bidirectional battery inverter, Regenerative infeed unitUse in builder
TCPower supply with AC or DC inputFor example Wide-range power supplyUse in builder
TCAUniversal supply with AC outputUse in builder
TCBUniversal supply with DC outputFor example Wide-range power supply for AC and DC inputUse in builder
TFConverting and transferring signalsFor example Amplifier, Antenna, Optocoupler, Media converterUse in builder
TFAAmplifier without changing the signal formFor example Measuring amplifier, Audio amplifier, Antenna amplifierUse in builder
TFBTransition between wired and wireless signalFor example Radio antenna, RFID antenna, Infrared transmitter, WLAN antennaUse in builder
TFCConverter between two wired signal formsFor example Optocoupler, Measuring transducer, Signal isolator, Interface converterUse in builder
TFDConverter between electrical and optical signalFor example Media converter, SFP transceiver, Fibre optic receiverUse in builder
TFEConverter between sound and electrical signalFor example Telephone, Mobile phone, Intercom station, HeadsetUse in builder
TLConverting mechanical energyFor example Gearbox, Torque converter, LeverUse in builder
TLAGearbox for changing speedFor example Spur gear unit, Worm gearbox, Planetary gearbox, Belt driveUse in builder
TLBConverter for changing torqueFor example Hydrodynamic torque converterUse in builder
TLCLever for changing forceFor example Toggle lever, Bell crank, Rocker armUse in builder
TMProcessing by material removalFor example Lathe, Laser cutting machine, Etching systemUse in builder
TMAMechanical machining or cuttingFor example Drilling machine, Milling machine, Lathe, SawUse in builder
TMBThermal cutting of materialFor example Laser cutting machine, Plasma cutting machine, Oxy-fuel cutting machine, Electrical discharge machineUse in builder
TMCChemical material removalFor example Etching system, Spray etching machine, Immersion etching tankUse in builder
TPForming of materialFor example Forging press, Press brake, Rolling standUse in builder
TPAForging machineFor example Forging hammer, Forging press, Drop forging pressUse in builder
TPBExtrusion machineFor example Aluminium extrusion press, Plastic extruderUse in builder
TPCMachine for drawing wire or tubeFor example Wire drawing machine, Tube drawing benchUse in builder
TPDForming by rollingFor example Rolling stand, Thread rolling machine, Knurling machineUse in builder
TPEBending machineFor example Press brake, Tube bending machine, Folding machineUse in builder
TPFForming at very high energy rateFor example Electromagnetic forming system, Electrohydraulic forming system, Explosive formingUse in builder
TRPlants and plantingFor example Tree, Hedge, LawnUse in builder
TRAWoody plant with one trunkFor example Deciduous tree, Conifer, Fruit treeUse in builder
TRBWoody plant with several stemsFor example Hedge, Ornamental shrub, Berry bushUse in builder
TRCClimbing or trailing plantFor example Ivy, Virginia creeper, ClematisUse in builder
TRDHerbaceous plant without woody stemFor example Lawn, Perennial, Flower, Vegetable plantUse in builder

UHolding, supporting and fixing components76 letter codes

UHolding, supporting and fixing componentsFor example Control cabinet, Cable tray, Insulator, MastUse in builder
UAFixing in a defined positionFor example Insulator, Cable gland, ChuckUse in builder
UAAInsulator holding conductorsFor example Post insulator, Suspension insulator, Busbar supportUse in builder
UABCable gland for cable entryFor example EMC cable gland, Cable entry plate, Cable grommet, Explosion-proof cable glandUse in builder
UACLuminaire housing holding the lampFor example Lamp holder, Linear luminaire, Recessed luminaireUse in builder
UADStair stringer holding the stepsFor example Central stair stringerUse in builder
UAEBattens as substructure for coveringsFor example Roof batten, Counter batten, Support battensUse in builder
UAFSupport for plantsFor example Trellis, Plant stake, Tree stakeUse in builder
UAGKeeping the spacing between railsUse in builder
UAHClamping device for tool or workpieceFor example Chuck, Vice, Collet, Zero-point clamping systemUse in builder
UAJStand for parking vehiclesFor example Bicycle rack, Bicycle hoop, Motorcycle standUse in builder
UBCarrying loads and equipmentFor example Cable tray, Mast, PlatformUse in builder
UBACable support system between two pointsFor example Cable tray, Cable ladder, Cable trunking, Wire mesh trayUse in builder
UBBHanger for suspended loadsFor example Ceiling hanger, Hanger bracket, Suspension rodUse in builder
UBCStep or tread for walking onFor example Ladder rung, Stair step, Step ironUse in builder
UBDMast or post as vertical supportFor example Overhead line pylon, Lighting column, Antenna mast, Fence postUse in builder
UBETable or platform as supporting surfaceFor example Workbench, Stage, Walkway, Raised platformUse in builder
UBFGantry between fixed supportsFor example Substation gantry, Sign gantryUse in builder
UCEnclosing and housingFor example Control cabinet, Enclosure, Fume hoodUse in builder
UCAControl cabinet or enclosure for equipmentFor example Control cabinet, Terminal box, Server rack, Console enclosureUse in builder
UCBPlanter for rootsFor example Flower pot, Plant tub, Raised bedUse in builder
UCCHood for local extractionFor example Extractor hood, Laboratory fume hood, Extraction hoodUse in builder
ULLoad-bearing structural elementsFor example Foundation, Column, Beam, WallUse in builder
ULABase layer of aggregateFor example Crushed stone base, Frost protection layer, Gravel bedUse in builder
ULBCorbel supporting elements aboveFor example Corbel stone, Wall bracket, Bearing corbelUse in builder
ULCPile transferring loads into the groundFor example Bored pile, Driven pile, MicropileUse in builder
ULDColumn transferring compressive forcesFor example Steel column, Concrete column, Pier, StrutUse in builder
ULEBeam under bending loadFor example Steel girder, Downstand beam, Timber beamUse in builder
ULFTension member taking tensile forcesFor example Tie rod, Ground anchor, Tension barUse in builder
ULGSolid block as a supportFor example Foundation block, Machine foundation, Masonry block, Concrete plinthUse in builder
ULHArch resisting bendingFor example Round arch, Arched girderUse in builder
ULJPlanar element for compression and bendingUse in builder
ULKSlab forming a load-bearing surfaceFor example Ground slab, Floor slab, Grating, Bridge deck slabUse in builder
ULLRetaining wall against lateral earth pressureFor example L-shaped retaining wall, Sheet pile wall, Gabion wallUse in builder
ULMLoad-bearing wall or wall panelFor example Precast concrete wall, Basement wallUse in builder
ULNShell or skin resisting tensionFor example Hull plating, Membrane roofUse in builder
ULPVault or domeFor example Domed roof, Barrel vault, Tunnel shellUse in builder
ULQLoad-distributing bearing plateFor example Base plate, Shim plate, Load spreading plateUse in builder
ULRSupporting cable for tensile forcesFor example Track rope of a cable car, Main cable of a suspension bridgeUse in builder
UMReinforcing structures and groundFor example Reinforcing bar, Welded steel mesh, ShotcreteUse in builder
UMAEmbedded bar for reinforcementFor example Reinforcing bar, Rock bolt, Soil nailUse in builder
UMBEmbedded mesh or fabric for reinforcementFor example Welded steel mesh, Geogrid, Reinforcing fabricUse in builder
UMCReinforcing material layerUse in builder
UMDInjected mass for reinforcementFor example Cement grouting, Jet grout column, Lime cement columnUse in builder
UMEReinforcing closure elementUse in builder
UMFReinforcement at splicesFor example Splice plateUse in builder
UMGVertical drain for ground drainageFor example Wick drain, Sand drainUse in builder
UMHShotcrete for stabilisationUse in builder
UMJConcrete liningFor example Tunnel inner lining, Shaft liningUse in builder
UMKStiffening of structural elementsFor example Stiffening rib, Buckling stiffener, ButtressUse in builder
UMLDiagonal bracingFor example Wind bracing, Cross bracing, Diagonal strutUse in builder
UMMGuying with cablesFor example Mast guy wire, Guy lineUse in builder
UMNHorizontal rail for reinforcementUse in builder
UMPCounterweight berm stabilising the groundUse in builder
UNFrames and surroundsFor example Door frame, Window frameUse in builder
UNAFixed frameFor example Door frame, Window outer frameUse in builder
UNBThreshold at the bottom of a doorFor example Door sillUse in builder
UNCMovable sash frameFor example Window sash, Door leaf frameUse in builder
UNDBar dividing a window or doorFor example Glazing bar, Mullion, TransomUse in builder
UPMovable bearings and jointsFor example Ball bearing, Hinge, Expansion jointUse in builder
UPABearing for moving partsFor example Deep groove ball bearing, Cylindrical roller bearing, Plain bearing, Bridge bearingUse in builder
UPBHinge or articulated jointFor example Door hinge, Piano hinge, Expansion jointUse in builder
UPCJoint with chemical bondingFor example Mortar joint, Silicone jointUse in builder
UQFixed fastening of componentsFor example Screw, Rivet, Weld seamUse in builder
UQAPermanent mechanical fasteningFor example Rivet, Nail, Blind rivetUse in builder
UQBDetachable mechanical fasteningFor example Screw, Nut, Threaded stud, Pipe clampUse in builder
UQCMaterially bonded fasteningFor example Weld seam, Adhesive bond, Solder jointUse in builder
UTGrading by fill or cutFor example Earth fill, Excavation pitUse in builder
UTAFill with added materialFor example Embankment fill, Backfill, Earth fillUse in builder
UTBCut by excavationFor example Excavation pit, Cutting, Cable trenchUse in builder
UUExisting natural groundUse in builder
UUAGround consisting of rockUse in builder
UUBNon-cohesive soilFor example Sand, GravelUse in builder
UUCCohesive soilFor example Clay, Loam, SiltUse in builder
UUDOrganic soilFor example Peat, Humus soilUse in builder
UUEExisting artificial fillFor example Made groundUse in builder

WConnections and paths for energy, signals and materials58 letter codes

WConnections and paths for energy, signals and materialsFor example Cable, Busbar, Pipe, ShaftUse in builder
WBConductors and busbars for high voltageFor example Medium-voltage cable, Overhead line, High-voltage bushingUse in builder
WBAHigh-voltage busbarFor example Tubular busbar, Busbar of medium-voltage switchgearUse in builder
WBBHigh-voltage cableFor example Medium-voltage cable, High-voltage underground cableUse in builder
WBCHigh-voltage wire or conductor ropeFor example Overhead line conductor, Contact wireUse in builder
WBDHigh-voltage bushing through a wall or enclosureFor example Transformer bushing, High-voltage wall bushingUse in builder
WDConductors and busbars for low voltageFor example Power cable, Copper busbar, Single-core wireUse in builder
WDALow-voltage busbarFor example Copper busbar in the control cabinet, Busbar trunking system, Comb busbarUse in builder
WDBLow-voltage cableFor example NYM sheathed cable, NYY cable, Motor cableUse in builder
WDCLow-voltage single wireFor example Single-core wire in the control cabinet, H07V-K single-core cable, Wire jumperUse in builder
WDDLow-voltage feedthrough through a wall or enclosureFor example Transformer bushing on the low-voltage sideUse in builder
WEConductors for earth and reference potentialFor example Protective earth conductor, Equipotential bonding conductor, Earthing stripUse in builder
WEAEarthing busbarFor example PE busbar, Earth busbar in the control cabinetUse in builder
WEBEarthing cableFor example Green-yellow protective earth wire, Earthing conductor to the earth electrodeUse in builder
WECEquipotential bonding busbarFor example Equipotential bonding barUse in builder
WEDEquipotential bonding cableFor example Bonding conductor, Flange bonding jumperUse in builder
WGLines for electrical signalsFor example Control cable, Data cable, Bus cableUse in builder
WGACable for control and measuring signalsFor example Shielded control cable, Measuring cable, Thermocouple extension cable, Sensor cableUse in builder
WGBCable for data transmissionFor example Ethernet cable, Fieldbus cable, Patch cable, USB cableUse in builder
WGCSignal feedthrough through a wall or enclosureUse in builder
WHGuiding and directing lightFor example Optical fibre, Lens, MirrorUse in builder
WHAFibre optic cable for signalsFor example Fibre optic cable, Fibre optic patch cable, Plastic optical fibreUse in builder
WHBLight guide for transmitting lightFor example Light guide rod, Optical fibre for lightingUse in builder
WHCLens for controlled refraction of lightFor example Converging lens, Diverging lens, Fresnel lensUse in builder
WHDMirror for controlled reflection of lightFor example Deflection mirror, Luminaire reflector, Reflector for a retro-reflective light barrierUse in builder
WJGuiding and directing soundFor example Acoustic reflector, Speaking tubeUse in builder
WJASurface for reflecting soundFor example Acoustic reflector above a stage, Sound reflecting wallUse in builder
WLGuiding solid materials along open pathsFor example Gravity roller conveyor, ChuteUse in builder
WLARoller track for guiding unit loadsFor example Gravity roller conveyor, Ball transfer table, Skate wheel conveyorUse in builder
WLBChute or slide for solid materialsFor example Chute, Spiral chute, Parcel slideUse in builder
WMOpen guidance of liquids and gasesFor example Roof gutter, Drainage pipe, Drainage channelUse in builder
WMALayer for draining water or venting airFor example Drainage mat, Gravel layer for drainageUse in builder
WMBOpen channel for draining liquidsFor example Roof gutter, Drainage channel, Box gutterUse in builder
WMCSheet for draining off liquidUse in builder
WMDDrip edge protecting against running waterUse in builder
WMEChannel profile for carrying off dripping waterUse in builder
WMFPerforated pipe for infiltration or ventilationFor example Drainage pipe, Partially perforated drain pipeUse in builder
WMGChamber for infiltration or ventingFor example Soakaway, Infiltration crateUse in builder
WPEnclosed guidance of material flowsFor example Pipe, Duct, HoseUse in builder
WPARigid pipe with round cross-sectionFor example Water pipe, Gas pipe, Waste water pipe, Refrigerant pipeUse in builder
WPBRigid duct with non-round cross-sectionFor example Rectangular ventilation duct, Flue shaftUse in builder
WPCFlexible hose for mediaFor example Water hose, Coolant hose, Flexible ventilation hoseUse in builder
WQTransmitting mechanical energyFor example Shaft, Belt, Chain, Gear wheelUse in builder
WQAShaft or axle for power transmissionFor example Drive shaft, Cardan shaft, Wheel axleUse in builder
WQBBelt for power transmissionFor example V-belt, Toothed belt, Flat beltUse in builder
WQCChain for power transmissionFor example Roller chain, Timing chain, Silent chainUse in builder
WQDLinkage for power transmissionFor example Push rod, Connecting rod, Lever linkageUse in builder
WQEWheel or gear for power transmissionFor example Spur gear, Sprocket, Belt pulley, Friction wheelUse in builder
WQFRack for linear power transmissionFor example Rack of a sliding gate drive, Steering rackUse in builder
WQGHydraulic or pneumatic lineFor example Hydraulic hose assembly, Compressed air hose, Hydraulic steel pipeUse in builder
WRGuidance for rail-bound vehiclesFor example Railway track, Crane railUse in builder
WRARail forming a continuous running pathFor example Railway rail, Crane runway rail, Running rail of an overhead conveyorUse in builder
WRBCrossing point on tracksUse in builder
WVConducting heatFor example Heat sink, Thermal pasteUse in builder
WVASolid body for conducting heatFor example Heat sink, Thermal pad, Heat spreader plateUse in builder
WVBPaste-like compound for heat transferFor example Thermal paste, Thermal gelUse in builder
WZLine for several kinds of mediaFor example Hybrid cable, Robot dress packUse in builder
WZACombined supply line for several mediaFor example Robot dress pack, Hybrid cable for power and data, Welding torch cable assemblyUse in builder

XInterfaces and connections to other parts56 letter codes

XInterfaces and connections to other partsFor example Terminal, Connector, FlangeUse in builder
XBHigh-voltage connectionsFor example Cable termination, High-voltage connectorUse in builder
XBASingle high-voltage connection pointFor example Cable termination, Cable joint, High-voltage terminalUse in builder
XBBPlug-in high-voltage connectionFor example High-voltage connector, Medium-voltage elbow connector, Medium-voltage T-connectorUse in builder
XBCJunction for several high-voltage cablesFor example High-voltage terminal box, Terminal box of a high-voltage motorUse in builder
XDLow-voltage connectionsFor example Terminal block, Socket outlet, Terminal boxUse in builder
XDASingle fixed low-voltage connectionFor example Feed-through terminal, Power terminal, Splicing connectorUse in builder
XDBPlug-in low-voltage connectionFor example Earthed socket outlet, CEE socket outlet, Appliance connector, Industrial connectorUse in builder
XDCEnclosure for several fixed low-voltage connectionsFor example Terminal box, Junction box, Motor terminal boxUse in builder
XDDFixed connection for flexible device cordsFor example Device connection box, Cooker connection unitUse in builder
XDEDistribution to several plug-in loadsFor example Power strip, Multi-socket adapter, Socket distribution unitUse in builder
XEConnections for earth and reference potentialFor example PE terminal, Earthing bar, Equipotential bonding barUse in builder
XEAConnection for the protective conductor PEFor example PE terminal, Protective earth terminal, PE busbarUse in builder
XEBConnection for protective bonding PBFor example Bonding terminal, Equipotential bonding barUse in builder
XECConnection for functional earth FEFor example FE terminal, Functional earth bar, Shield connection clampUse in builder
XEDConnection for functional bonding FBFor example FB terminalUse in builder
XEEEarth electrode connecting to the groundFor example Driven earth rod, Strip earth electrode, Foundation earth electrode, Ring earth electrodeUse in builder
XEFAir termination for lightning strikesFor example Air termination rod, Air termination conductorUse in builder
XGConnections for electrical signalsFor example Signal terminal, D-sub connector, M12 connectorUse in builder
XGAPlug-in connection for electrical signalsFor example RJ45 jack, M12 socket, D-sub socketUse in builder
XGBSingle fixed connection for signalsFor example Signal terminal, Sensor terminal, Measuring disconnect terminalUse in builder
XGCConnection panel for many signal linesFor example Patch panel, Cross-connect distributor, Interface moduleUse in builder
XHConnections for optical fibresFor example Fibre splice box, Fibre patch panelUse in builder
XHAPlug-in connection for optical fibresFor example LC connector, SC adapter, ST connector, Fibre outlet boxUse in builder
XKCollecting and discharging into a drainFor example Washbasin, Floor drainUse in builder
XKABasin with drain for used waterFor example Washbasin, Sink, Slop sinkUse in builder
XKBToilet for human excretaFor example WC, Wall-hung toilet, Floor-standing toiletUse in builder
XKCBowl for urine onlyFor example Urinal, Waterless urinalUse in builder
XKDCollecting excess liquid from technical systemsFor example Drip tray, Condensate tray, Spill trayUse in builder
XKEDrain for excess waterFor example Floor drain, Roof drain, Drainage channelUse in builder
XMSealed connection for pipes and hosesFor example Pipe flange, Hose couplingUse in builder
XMADetachable sealed pipe or hose connectionFor example Pipe flange, Quick coupling, Screwed pipe fitting, Hose couplingUse in builder
XMBPermanent sealed pipe or hose connectionFor example Press fitting, Solder fitting, Solvent weld socket, Welding socketUse in builder
XNPermanently connected shaft couplingFor example Shaft coupling, Universal jointUse in builder
XNAJoining two shafts via flangesFor example Flange couplingUse in builder
XNBShaft connection with a split sleeveFor example Split muff couplingUse in builder
XNCPositive face toothing between shaftsFor example Hirth jointUse in builder
XNDArticulated coupling for misaligned shaftsFor example Universal joint, Cardan shaft, Flexible coupling, Jaw couplingUse in builder
XNEBuffer and chain coupling for vehiclesFor example Screw coupling on railway wagonsUse in builder
XNFCoupling two moving units with a pinUse in builder
XPCoupling with releasable power transmissionFor example Friction clutch, Freewheel, Fluid couplingUse in builder
XPAPower transmission by frictionFor example Multi-plate clutch, Single-plate clutch, Centrifugal clutch, Slip clutchUse in builder
XPBPower transmission by flowing fluidFor example Turbo coupling, Hydrodynamic coupling, Torque converterUse in builder
XPCCoupling locking in one direction of rotationFor example Freewheel, Roller freewheel, Ratchet freewheelUse in builder
XPDHolding loads by magnetic forceFor example Lifting magnet, Crane magnetUse in builder
XSConnection between different levelsFor example Stairs, Ladder, RampUse in builder
XSAHorizontal platform at a flight of stairsFor example Stair landing, Intermediate landingUse in builder
XSBSequence of steps between levelsFor example Straight staircase, Spiral staircase, Steel staircaseUse in builder
XSCClimbing via rungs or stepsFor example Fixed ladder, Leaning ladder, Shaft ladderUse in builder
XSDInclined surface between levelsFor example Wheelchair ramp, Drive-on rampUse in builder
XSEVertical pole for sliding downFor example Slide pole in fire stationsUse in builder
XTConnecting spaces via openingsFor example Wall opening, Slab openingUse in builder
XTAOpening or recess in a componentFor example Wall opening, Core hole, RecessUse in builder
XTBCavity connecting spacesUse in builder
XZConnections for several media typesFor example Hybrid connector, Media couplingUse in builder
XZACombined connection for power, signals and mediaFor example Hybrid connector, Multi-coupling, Tool changer couplingUse in builder

ASeveral purposes or tasks in one object5 letter codes

ASeveral purposes or tasks in one objectUse in builder
AA … AEFree for user-defined subdivision, electrical energy
AF … AKFree for user-defined subdivision, information and signals
AL … AYFree for user-defined subdivision, process, mechanical and civil
AZCombination of several tasks in this classUse in builder

BSensing a variable and converting it into a signal25 letter codes

BSensing a variable and converting it into a signalUse in builder
BASensing electrical voltageFor example Voltage transformer, Voltage sensorUse in builder
BBReserved, currently not assigned
BCSensing electric currentFor example Current transformer, Current sensor, Measuring shuntUse in builder
BDSensing densityFor example Density sensorUse in builder
BESensing other electrical variablesFor example Instrument transformerUse in builder
BFSensing flowFor example Flow sensor, Flow switch, Water meter, Gas meterUse in builder
BGSensing position, travel or distanceFor example Limit switch, Proximity switch, Displacement transducer, Motion detectorUse in builder
BHReserved, currently not assigned
BJSensing powerFor example Power sensorUse in builder
BKSensing timeFor example Clock, Radio-controlled clockUse in builder
BLSensing level or heightFor example Level sensor, Float switch, Point level switch, Echo sounderUse in builder
BMSensing humidityFor example Humidity sensor, HygrometerUse in builder
BNNot used in this edition
BPSensing pressure or vacuumFor example Pressure sensor, Pressure switch, Pressure gauge, Vacuum switchUse in builder
BQSensing quality or composition of substancesFor example pH sensor, Conductivity sensor, Gas analyser, Oxygen probeUse in builder
BRSensing radiation or lightFor example Photocell, Twilight switch, Flame detector, Smoke detectorUse in builder
BSSensing speed, rotational speed, frequency or vibrationFor example Speed sensor, Tachogenerator, Vibration sensor, Speed monitorUse in builder
BTSensing temperatureFor example Pt100 sensor, Thermocouple, Thermostat, ThermometerUse in builder
BUSensing several variables at onceFor example Buchholz relay, Combined temperature and humidity sensorUse in builder
BVReserved, currently not assigned
BWSensing weight, force or massFor example Load cell, Force transducer, Strain gaugeUse in builder
BXSensing other variablesFor example Camera, MicrophoneUse in builder
BYReserved, currently not assigned
BZSensing count or quantityFor example Piece counter, Operating cycle counterUse in builder

CStoring energy, data or materials11 letter codes

CStoring energy, data or materialsUse in builder
CACapacitive storage of electrical energyFor example Capacitor, SupercapacitorUse in builder
CBInductive storage of electrical energyFor example Storage coil, Superconducting magnetic energy storageUse in builder
CCChemical storage of electrical energyFor example Battery, Rechargeable battery, Backup battery, UPS batteryUse in builder
CFStoring data and informationFor example Memory card, Hard disk, Data logger, Fault recorderUse in builder
CLStoring materials, stationary and openFor example Collecting basin, Bulk material bunker, PitUse in builder
CMStoring materials, stationary and closedFor example Tank, Silo, Pressure vessel, Feed tankUse in builder
CNStoring materials in mobile containersFor example Container, Gas cylinder, Drum, IBC containerUse in builder
CPStoring heat or coldFor example Buffer tank, Hot water storage tank, Ice storage, Steam accumulatorUse in builder
CQStorage of kinetic or potential energyFor example FlywheelUse in builder
CZCombination of several tasks in this classUse in builder

EEmitting light, radiation, heat or cold16 letter codes

EEmitting light, radiation, heat or coldUse in builder
EAElectrically generated light for illuminationFor example Luminaire, LED lamp, Fluorescent lamp, Enclosure lightUse in builder
EBElectrically generated heatFor example Heating rod, Enclosure heater, Trace heating, Infrared heaterUse in builder
ECElectrically generated coolingFor example Enclosure cooling unit, Compression refrigeration machine, Peltier coolerUse in builder
EESource of other electromagnetic radiationFor example Microwave generator, X-ray tubeUse in builder
EFRadiation source for signalling purposesUse in builder
ELRadiation or light from burning fuelsFor example Gas lamp, Kerosene lampUse in builder
EMHeat generation from chemical energyFor example Heating boiler, Gas burner, Oil burner, IncineratorUse in builder
ENCold generation from chemical energyFor example Absorption chillerUse in builder
EPProviding heat by heat transferFor example Heat exchanger, Radiator, Heating coil, Waste heat boilerUse in builder
EQProviding cooling by heat transferFor example Cooling coil, Air-to-water heat exchangerUse in builder
ERHeat generation from mechanical energyUse in builder
ESCold generation from mechanical energyUse in builder
ETHeat generation by nuclear fissionFor example Nuclear reactorUse in builder
EUSource of particle radiationFor example Neutron generator, Particle acceleratorUse in builder
EZCombination of several tasks in this classUse in builder

FAutomatic protection against hazards and fault conditions12 letter codes

FAutomatic protection against hazards and fault conditionsUse in builder
FAProtection against overvoltage and lightning currentsFor example Surge arrester, Lightning current arrester, VaristorUse in builder
FBProtection against residual currentsFor example Residual current device, Type B residual current deviceUse in builder
FCProtection against overcurrent and short circuitFor example Fuse, Miniature circuit breaker, Motor protection circuit breaker, Equipment circuit breakerUse in builder
FLProtection against dangerous overpressure or vacuumFor example Safety valve, Bursting disc, Vacuum breakerUse in builder
FMProtection against fire spread and fire effectsFor example Fire damper, Fire door, Sprinkler systemUse in builder
FNProtecting machinery against damage in operationFor example Safety coupling, Impact protection, Protective tube for temperature sensorsUse in builder
FPProtecting the surroundings from noise, radiation and pollutantsUse in builder
FQProtecting people and animals from hazardsFor example Safety fence, Railing, Touch guard, Protective grilleUse in builder
FRProtection against corrosion and wearFor example Sacrificial anode, Cathodic corrosion protectionUse in builder
FSProtection against weather and natural eventsFor example Weather canopy, Weather hood, Avalanche barrierUse in builder
FZCombination of several tasks in this classUse in builder

GStarting a flow of energy or material, generating signals12 letter codes

GStarting a flow of energy or material, generating signalsUse in builder
GAGenerating electricity from mechanical energyFor example Generator, Emergency generator set, AlternatorUse in builder
GBGenerating electricity by chemical conversionFor example Fuel cellUse in builder
GCGenerating electricity from lightFor example Solar cell, Photovoltaic moduleUse in builder
GFSignal source for clock, reference or testFor example Signal generator, Clock generator, OscillatorUse in builder
GLContinuous conveying of solidsFor example Belt conveyor, Chain conveyor, Roller conveyor, Vibratory conveyorUse in builder
GMDiscontinuous conveying of solidsFor example Overhead crane, Elevator, Chain hoist, ForkliftUse in builder
GPContinuous pumping of liquids and slurriesFor example Centrifugal pump, Dosing pump, Progressive cavity pumpUse in builder
GQConveying and compressing gasesFor example Fan, Enclosure fan, Compressor, Vacuum pumpUse in builder
GSConveying by means of a motive fluidFor example Jet pump, Ejector, InjectorUse in builder
GTConveying fluids by gravityFor example Drip oiler, SiphonUse in builder
GZCombination of several tasks in this classUse in builder

HProducing new materials or products16 letter codes

HProducing new materials or productsUse in builder
HKSeparating materials by particle sizeFor example Sieve, Screening machine, Bar screenUse in builder
HLMaking products by assemblyFor example Assembly robot, Automatic assembly machineUse in builder
HMSeparation by centrifugal forceFor example Centrifuge, Cyclone separator, Decanter centrifugeUse in builder
HNSeparation by gravityFor example Settling tank, Thickener, Oil separatorUse in builder
HPSeparation using heatFor example Distillation column, Dryer, Evaporation plantUse in builder
HQSeparation by filtrationFor example Liquid filter, Air filter, Filter pressUse in builder
HRSeparation by electric or magnetic fieldsFor example Electrostatic precipitator, Magnetic separator, Eddy current separatorUse in builder
HSSeparation by other physical processesFor example Ion exchanger, Activated carbon adsorber, Gas scrubberUse in builder
HTProducing gaseous substancesFor example GasifierUse in builder
HUSize reduction of solidsFor example Mill, Crusher, ShredderUse in builder
HVAgglomerating solids into larger shapesFor example Pellet press, Briquetting press, Tablet pressUse in builder
HWMixing substancesFor example Mixer, Agitator, Kneader, Static mixerUse in builder
HXConversion of substances by chemical reactionFor example Chemical reactor, Reaction furnaceUse in builder
HYConversion of substances by biological processesFor example Fermenter, Bioreactor, Composting plantUse in builder
HZCombination of several tasks in this classUse in builder

KProcessing signals and information, excluding protective devices8 letter codes

KProcessing signals and information, excluding protective devicesUse in builder
KEProgram-controlled processing of electrical signalsFor example PLC, I/O module, Industrial PC, RouterUse in builder
KFLinking and passing on electrical signalsFor example Interface relay, Time relay, Optocoupler, Auxiliary contactorUse in builder
KGSignal processing with light or soundUse in builder
KHProcessing hydraulic and pneumatic control signalsFor example Pilot valve, Pneumatic positioner, Valve blockUse in builder
KJMechanical signal processingFor example Control linkage, Centrifugal governorUse in builder
KKSignal processing with a change of signal mediumFor example Electro-pneumatic positioner, I/P converter, Electrically operated pilot valveUse in builder
KZCombination of several tasks in this classUse in builder

MProviding mechanical drive energy11 letter codes

MProviding mechanical drive energyUse in builder
MAElectric motor driveFor example Three-phase motor, Geared motor, Stepper motor, Linear motorUse in builder
MBDrive by magnetic forceFor example Solenoid actuator, Electromagnet, Valve solenoid coilUse in builder
MLMechanical drive by spring or weightFor example Stored-energy spring mechanism, Weight drive, Friction wheel driveUse in builder
MMHydraulic or pneumatic driveFor example Pneumatic cylinder, Hydraulic cylinder, Hydraulic motor, Pneumatic rotary actuatorUse in builder
MNDrive by steamFor example Steam turbineUse in builder
MPDrive by gas flowFor example Gas turbineUse in builder
MQWind-powered driveFor example Wind turbineUse in builder
MRDrive by flowing water or liquidFor example Water turbine, Water wheel, Pelton turbineUse in builder
MSDrive from chemical energyFor example Diesel engine, Combustion engine, Gas engineUse in builder
MZCombination of several tasks in this classUse in builder

PDisplaying and presenting information7 letter codes

PDisplaying and presenting informationUse in builder
PFVisible indication of individual statesFor example Indicator light, Signal tower, Rotating beaconUse in builder
PGDisplay of individual measured valuesFor example Ammeter, Voltmeter, Multifunction meter, Operating hours counterUse in builder
PHDisplay of text, graphics or imagesFor example Monitor, Text display, Large displayUse in builder
PJAudible output of informationFor example Horn, Buzzer, Siren, LoudspeakerUse in builder
PKTactile output of informationFor example Vibration alarm, Braille displayUse in builder
PZCombination of several tasks in this classUse in builder

QDeliberate switching and control of energy, signals and materials12 letter codes

QDeliberate switching and control of energy, signals and materialsUse in builder
QASwitching and controlling electrical power circuitsFor example Circuit breaker, Contactor, Soft starter, Thyristor power controllerUse in builder
QBIsolating electrical power circuitsFor example Disconnector, Switch disconnector, Main switchUse in builder
QCSwitchable earthing of circuitsFor example Earthing switch, Earthing disconnectorUse in builder
QLBraking mechanical movementFor example Motor brake, Spring-applied brake, Disc brakeUse in builder
QMShutting off flow in pipes and ductsFor example Butterfly valve, Ball valve, Solenoid valve, Gate valveUse in builder
QNRegulating flow in pipes and ductsFor example Control valve, Control damper, Gas control trainUse in builder
QPControlling liquids in open channelsFor example Weir, Lock gate, Stop logUse in builder
QQOpening and blocking accesses and openingsFor example Door, Roller door, Turnstile, WindowUse in builder
QRShutting off a material flow without valvesFor example Rotary airlock, Bulk material slide gateUse in builder
QSReleasing or diverting mechanical movementFor example Rail switch, Interlocking deviceUse in builder
QZCombination of several tasks in this classUse in builder

RLimiting or stabilizing flows and movements14 letter codes

RLimiting or stabilizing flows and movementsUse in builder
RALimiting electric currentsFor example Resistor, Line reactor, Diode, Braking resistorUse in builder
RBSmoothing and limiting electrical energyFor example Smoothing capacitorUse in builder
RFStabilizing and filtering signalsFor example Low-pass filter, Equalizer, Signal filterUse in builder
RLMechanical blocking against unauthorized operation or movementFor example Arresting device, Padlock, Blocking deviceUse in builder
RMPreventing backflowFor example Check valve, Non-return flapUse in builder
RNRestricting fluid flowFor example Orifice plate, Venturi nozzle, Flow limiterUse in builder
RPDamping sound and noiseFor example Silencer, Acoustic enclosure, Noise barrierUse in builder
RQThermal insulation against heat or coldFor example Thermal insulation, Pipe insulation, Refractory liningUse in builder
RRDamping and absorbing mechanical loadsFor example Vibration damper, Expansion joint, Wear liningUse in builder
RSShielding against chemical attackFor example Acid-resistant lining, Splash guard, Rubber liningUse in builder
RTShielding against incident lightFor example Venetian blind, Light shield, Roller blindUse in builder
RURestricting movement on sites and terrainFor example Fence, Guard rail, BollardUse in builder
RZCombination of several tasks in this classUse in builder

SConverting a manual action into a signal6 letter codes

SConverting a manual action into a signalUse in builder
SFConverting manual operation into an electrical signalFor example Push button, Selector switch, Emergency stop button, KeyboardUse in builder
SGConverting manual operation into radio, light or sound signalsFor example Handheld radio transmitter, Wireless mouse, Infrared remote controlUse in builder
SHConverting manual operation into a mechanical signalFor example Handwheel, Hand leverUse in builder
SJConverting manual operation into a hydraulic or pneumatic signalFor example Hand lever valve, Pneumatic push buttonUse in builder
SZCombination of several tasks in this classUse in builder

TConverting energy and signals, shaping material10 letter codes

TConverting energy and signals, shaping materialUse in builder
TAConverting electrical energy without changing the current typeFor example Transformer, Control transformer, DC/DC converter, Frequency converterUse in builder
TBConverting electrical energy with a change of current typeFor example Rectifier, Inverter, Switched-mode power supply, Battery chargerUse in builder
TFConverting signals without changing their contentFor example Isolating amplifier, Measuring transducer, Signal converter, AntennaUse in builder
TLTransforming speed, torque or forceFor example Gearbox, Torque converterUse in builder
TMShaping by cuttingFor example Lathe, Milling machine, Saw, Drilling machineUse in builder
TPChipless cold formingFor example Deep drawing press, Cold rolling mill, Bending machineUse in builder
TQChipless hot formingFor example Forging press, Hot rolling mill, Extrusion press, Casting plantUse in builder
TRFocusing or redirecting radiationFor example Converging lens, Parabolic mirrorUse in builder
TZCombination of several tasks in this classUse in builder

UHolding and supporting objects in a fixed position15 letter codes

UHolding and supporting objects in a fixed positionUse in builder
UASupporting electrical power equipmentFor example Support structure, Supporting frameUse in builder
UBSupporting and routing power cablesFor example Cable tray, Cable ladder, Cable duct, Overhead line poleUse in builder
UCEnclosing electrical power equipmentFor example Distribution enclosure, Encapsulation, Power distribution cabinetUse in builder
UFHolding and enclosing control and communication equipmentFor example Subrack, Printed circuit board, Transmitter rackUse in builder
UGSupporting signal and data cables, routed separatelyFor example Cable duct for control cables, Cable tray for data cablesUse in builder
UHEnclosing control equipmentFor example Control cabinet, Server cabinet, Field enclosure for control equipmentUse in builder
ULSupporting and bearing machineryFor example Machine foundation, Machine frame, Base frameUse in builder
UMLoad-bearing parts of buildings and structuresFor example Foundation, Column, Downstand beam, ShaftUse in builder
UNSupporting pipelinesFor example Pipe bridge, Pipe support, Pipe clampUse in builder
UPBearing and guiding shaftsFor example Ball bearing, Plain bearing, Pillow block bearingUse in builder
UQHolding workpieces during production and assemblyFor example Clamping fixture, Gripper, Workpiece carrierUse in builder
URFixings and anchorages for machineryFor example Bracket, Anchor plate, Mounting plateUse in builder
USRooms and buildings that house other objectsFor example Hall, Switch room, CorridorUse in builder
UZCombination of several tasks in this classUse in builder

VTreatment of materials and goods7 letter codes

VTreatment of materials and goodsUse in builder
VLFilling packages and containersFor example Bag filling machine, Drum filling station, Bottle fillerUse in builder
VMPacking and palletizing productsFor example Packaging machine, Palletizer, Stretch wrapperUse in builder
VNSurface treatmentFor example Painting line, Grinding machine, Polishing machine, Sandblasting unitUse in builder
VPRefining and treating materialsFor example Annealing furnace, Melting furnace, Hardening furnaceUse in builder
VQCleaning materials, products and equipmentFor example Industrial vacuum cleaner, Washing unit, Parts cleaning machineUse in builder
VZCombination of several tasks in this classUse in builder

WTransferring energy, signals and materials between locations18 letter codes

WTransferring energy, signals and materials between locationsUse in builder
WAPower distribution at voltages of 1 kV and aboveFor example Medium-voltage busbarUse in builder
WBPower transmission via cables and lines at 1 kV and aboveFor example Medium-voltage cable, High-voltage overhead line, Bushing at 1 kV and aboveUse in builder
WCPower distribution at voltages below 1 kVFor example Low-voltage busbar, Busbar system in the cabinet, Comb busbarUse in builder
WDPower transmission via cables and lines below 1 kVFor example Power cable, Motor cable, Single-core wireUse in builder
WEConductors for earthing and reference potentialFor example Protective earth conductor, Equipotential bonding conductor, Earthing busbarUse in builder
WFSignal and data distribution via busesFor example Fieldbus, Data bus, Backplane busUse in builder
WGTransmitting electrical signalsFor example Control cable, Measuring cable, Network cable, Bus cableUse in builder
WHTransmitting optical signalsFor example Optical fibre cable, Fibre optic patch cordUse in builder
WLMoving goods without a driveFor example Chute, Gravity roller conveyor, Roller tableUse in builder
WMGuiding fluids in open channels and guttersFor example Gutter, Channel, Drain channelUse in builder
WNGuiding fluids in flexible linesFor example Hose, Compressed air hose, Hydraulic hoseUse in builder
WPGuiding fluids in rigid linesFor example Pipeline, Ventilation duct, ChimneyUse in builder
WQTransmitting drive power and motionFor example Drive shaft, V-belt, Chain, Toothed beltUse in builder
WRGuiding rail-bound vehiclesFor example Running rail, Crane rail, TrackUse in builder
WSWalkways and platforms for peopleFor example Stairs, Catwalk, Working platform, Fixed ladderUse in builder
WTTraffic routes for mobile vehiclesFor example Road, Driveway, WaterwayUse in builder
WZCombination of several tasks in this classUse in builder

XConnection points between objects14 letter codes

XConnection points between objectsUse in builder
XBConnections at 1 kV and aboveFor example Medium-voltage joint, Cable termination, Medium-voltage connectorUse in builder
XDConnections below 1 kVFor example Terminal block, Socket outlet, Power connector, Cable jointUse in builder
XEConnection to earth or reference potentialFor example PE terminal, Shield connection clamp, Earthing terminalUse in builder
XFNodes in data networksFor example Network switch, Patch panel, HubUse in builder
XGElectrical connection of signalsFor example Signal terminal, M12 connector, Marshalling panelUse in builder
XHOptical connection of signalsFor example Fibre optic connector, Splice box, Fibre optic couplerUse in builder
XLJoining rigid pipe and duct partsFor example Flange, Fitting, Pipe unionUse in builder
XMJoining flexible lines for fluidsFor example Hose coupling, Hose connector, Quick couplingUse in builder
XNRigid connection for power transmissionFor example Rigid coupling, Flange coupling, Sleeve couplingUse in builder
XPSwitchable or variable connection for power transmissionFor example Clutch, Electromagnetic clutchUse in builder
XQPermanent, non-detachable jointsFor example Weld seam, Solder joint, Adhesive joint, Riveted jointUse in builder
XRDetachable mechanical connectionsFor example Hook, Eyelet, Shackle, Bolted jointUse in builder
XZCombination of several tasks in this classUse in builder

Letter codes to EN IEC 81346-2:2019 and EN 81346-2:2009. Descriptions and examples are written in our own words and do not replace the text of the standard.

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What is the difference between the 2009 and 2019 editions?

The 2019 edition adds a third level with three letters. It also drops the main classes A and V from the 2009 edition and adds N for covering and closing. Many common subclasses such as QA, FC or XD are the same in both editions.

Which edition should I use?

The one agreed for the project. For new projects the 2019 edition is a good choice. Existing plants are better continued in their own system than turned into a half-converted installed base.

Do I have to use all three letters?

No. In electrical design two letters are usually enough, for example QA for a contactor. The third level helps when similar components need to be told apart more finely.

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Find letter codes to EN IEC 81346-2

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