37 — Calculators
Build a reference designation to IEC 81346
Labelling is what plant documentation stands or falls on in the long run. Anyone looking for a component ten years later finds it through the designation or not at all. This builder shows the structure and the common letter codes.
Result
- Complete reference designation
- —
- Structure
- —
Please fill all fields with valid numbers.
- Opens the print dialog. Choose “Save as PDF” as the destination.
- Opens your email program with the values from this calculation. Nothing is sent to us until you send it yourself.
A guide, not a design to standard. We give no warranty for the correctness of the results, the applicable standards and case-by-case verification govern.
Worked example
The default case the calculator starts with, worked through once. Change the values above and it recalculates immediately.
Inputs
- Function (=)
- =A1, plant section 1
- Location (+)
- +S1, control cabinet 1
- Component (−)
- −Q, switching energy (contactor, breaker)
- Sequential number
- 12
- Terminal (:)
- 0
Result
- Complete reference designation
- =A1+S1-Q12
- Structure
- = function · + location · − component with letter code and number · : terminal
Formula
- =Function +Location −Component :Terminal
- Example: =A1+S1-Q12:14
- = functional assignment · + mounting location · − product · : terminal
Assumptions and standards
- Letter codes to IEC 81346-2 (formerly EN 61346-2 and before that DIN 40719).
- The prefixes are standardised, the numbering behind them is not. It follows the operator’s system. That is exactly why an agreed system matters so much.
- This builder shows the most common letter codes, not the complete table from the standard.
Frequently asked
What is the difference between = and +?
The equals sign describes function, what a component belongs to. The plus sign describes location, where it is installed. A contactor can belong functionally to the conveyor line (=F1) while sitting in control cabinet 2 (+S2).
Do I have to use every level?
No. In small installations the product level alone (−Q12) is often enough. As soon as there are several cabinets or plant sections, adding location and function quickly becomes indispensable.
We have our own grown system. Should we switch?
Usually not. A consistently applied in-house system beats a half-converted installed base. In projects we continue existing systems rather than replacing them. A break in the documentation costs more than the standard gains.
Calculating is the easy part.
A formula gives you a number. Designing a plant also demands installation method, grouping, discrimination, the standards in force and a look at the installed base. That is what we take on.
More tools
- 01Cable cross-section
- 02Voltage drop
- 03Cable resistance
- 04Cable losses
- 05Maximum cable length
- 06Current-carrying capacity
- 07Parallel cables
- 08Conductor temperature
- 09Cable capacitance
- 10Short-circuit current
- 11Cable impedance
- 12Network impedance
- 13Short-circuit current at the far end
- 14Thermal short-circuit withstand
- 15Length and disconnection
- 16Motor current
- 17Torque
- 18Starting current
- 19Star-delta starting
- 20Soft starting
- 21Motor efficiency
- 22Speed control instead of throttling
- 23Speed and slip
- 24Setting the motor protection
- 25Single-phase motor
- 26Motor feeder
- 27Required motor rating
- 28PFD and SIL
- 29PFH and SIL
- 30Protective conductor size
- 31Earth rod
- 32Touch voltage
- 33Residual current protection
- 34Check discrimination
- 35Connecting a surge arrester
- 36Enclosure cooling
- 38Reactive power compensation
Contact
Tell us what it is about.
A phone call or three lines is enough. From the very start you talk to the people who will later work on your project, not to a distribution list.
Direct
- Phone+49 (0) 5247 4070-66
- Emailinfo@fisekon.com
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Locations
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33332 Gütersloh
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