How much Protective Current Rating of Building Branch Circuit should be considered?

R

Roland chung

Trusted Information Resource
#1
#1
Hi all,

From the philosophy of IEC 60601-1, opening of a branch circuit breaker is not acceptable. But standard does not specify how much of the protective current rating of branch circuit breaker.

From memory, it seems to be 16A in Europe, 20A in North America. However, I can not find them from documents. Could you give me a hint? Thanks.

Roland
 
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MIREGMGR

#2
#2
Re: How much Protective Current Rating of Building Branch Circuit should be considere

Common branch circuit breaker ratings in US are 20A in many cases in modern commercial/organizational buildings, and 15A or 20A in older buildings of such types and in residences.

The (non-universal but broadly adopted) National Electrical Code, published by NFPA, requires (if I remember correctly) that the maximum sustained load on a branch circuit be no more than 80% of the interrupter rating.
 
P

Pads38

Moderator
#3
#3
Re: How much Protective Current Rating of Building Branch Circuit should be considere

!5 or 16A in Europe.
Except that, in the UK (and Ireland) many power circuits, especially in domestic and smaller installations, are wired in a ring and protected at 32A. Which is why we need fuses in our plug-tops.
 
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