Breaker Selection for Feeders - IEC

[NickParker]

How to size the conductor & breaker for group of motors/mixed loads using IEC standards. (for example in NEC, the article 430.24 & 430.62 is used); I did a google search and all I could find is to use a type -2 co-ordination chart for single motors and I could not find anything for breaker sizing of feeders.

Thanks!

 

[123MB]

Hi Nick,

We size the conductors so that they are protected from overload and short circuit by the breakers feeding them. We then size the breakers so that they can start/run the loads.

I'm not aware of any rules in IEC that are as prescriptive as NEC 430.24 & 430.62.

The usage of Type 2 coordination is not a requirement, It is very common though.

I am aware that I have probably not answered your question. Feel free to hit back with some more detail and I will try to answer as best I can. But I suspect others may provide better answers in the mean time .