Hello,
I would like to ask, when marking electrical components according to the IEC 81346 standard, how many letters do you use? Previously, I marked the contactor as -KM and the motor protection as -QM. According to IEC 81346 standard, I see that the contactor and the circuit breaker are marked as -QA, but if you use three letters, it changes, as the contactor would be -QAA, and the thermal protection would be -QAB.
Solved! Go to Solution.
Solved by rhesusminus. Go to Solution.
I use the 2-letter class designations from the IEC-60617 library folder, in AutoCAD Electrical. When my customer prefers the original 1-letter class designations, I use the symbols from the IEC4 folder. My tagging format is Sheet, Zone and Suffix. My suffix setup is .1, .2 ,.3, etc.
Doug McAlexander
Design Engineer/Consultant/Instructor/Mentor
Specializing in AutoCAD Electrical Implementation Support
Phone: (770) 841-8009
www.linkedin.com/in/doug-mcalexander-1a77623
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Thank @dougmcalexander for the answer, although I think this question didn't get a response.
I drew two simple electrical diagrams based on IEC 81346, using two and three letters and symbols. I want to use this standard in my electrical diagrams, so I am trying to understand how to apply it. But how can a three-letter inscription fit in reality, for example, on a slim relay, as it barely accommodates three characters? On paper, I can create anything, but in reality, it might not work.
I answered your question. IEC-81346 uses two class designation letters, not three. After that, you delineate with the suffix.
Doug McAlexander
Design Engineer/Consultant/Instructor/Mentor
Specializing in AutoCAD Electrical Implementation Support
Phone: (770) 841-8009
www.linkedin.com/in/doug-mcalexander-1a77623
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I still use the one letter standard, from IEC4, unless forced otherwise. My IEC customers are still using one letter.
I think this designer is wanting the third letter to be automatically assigned as A, B, C, etc. That is possible but I think he will need to use the symbols from the IEC-60617 library folder with A, B, C, etc. suffixes, instead of the -1, -2, -3, etc. that he mentioned.
Doug McAlexander
Design Engineer/Consultant/Instructor/Mentor
Specializing in AutoCAD Electrical Implementation Support
Phone: (770) 841-8009
www.linkedin.com/in/doug-mcalexander-1a77623
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I still use the one letter standard, from IEC4, unless forced otherwise. My IEC customers are still using one letter.
Doug McAlexander
Design Engineer/Consultant/Instructor/Mentor
Specializing in AutoCAD Electrical Implementation Support
Phone: (770) 841-8009
www.linkedin.com/in/doug-mcalexander-1a77623
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If the customer specifies the use of three letter designations according to the latest standard, you don't just slap on a suffix. It means something.
"M" means some kind of moving object. "MA" means "object rotated by electromagnetic energy". "MAB" goes one step further, to specify that it's a stepper motor.
The whole idea is to be able to know more about your device just by seeing the tag.
A _real_ CAE program would of course help you with this as you work:
Thanks for the discussion on this. I still need to work on it myself. I’m just curious: if you chose to mark elements in the drawing according to the three-letter standard, is it possible to mark elements in the drawing with two letters? Sometimes it's hard to decide what function each element performs. ![]()
I wouldn't recommend it. Documentation <-> As Built should match, or else it might lead to confusion at a later time.
The answer provided by rhesusminus is quite accurate. However the amount of letters in a letter code also has meaning. This means "QA" does not necessarily mean the parent class to QAA or QAB. If the client is using ISO 81346-10 (RDS-PS), "QA" means a technical system for storage of gas and air. The recommendation is that components should always be identified with a three letter code, as it is more precise, but this depends on the client and which parts of the 81346 standard series is applied. If you are in doubt about the last letter in a three letter code, questionmark can be used as a wildcard. E.g. "QA?" refers to the parent class of QAA and QAB, a "controlling object of electric current in an electric circuit.
Br
Philip
Hi there @rhesusminus ! Do you think I could get your advice on this using the EPLAN P8? I’m feeling a bit overwhelmed and could really use your help.
Try Discord:
This is users helping users. I'm on holiday as many, many others.
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