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 Post subject: Short Circuit Rating of Equipment less than 50Vdc
PostPosted: Fri Sep 21, 2012 5:51 am 

Joined: Thu Oct 27, 2011 5:00 pm
Posts: 5
Location: Vermilion Ohio
I have been asked by my customer how does the NEC apply to a -48VDC system (Gov't office). The question relates to short-circuit rating of equipment feed by a -48VDC battery back-up system.

If I remeber correctly the NEC excludes low voltage systems (<72V), which it does not governn, but I can not find this within teh NEC code book.

Can anyone asist?

Thanks
Jack


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PostPosted: Mon Sep 24, 2012 2:15 pm 
Arc Level

Joined: Mon Jan 18, 2010 11:35 am
Posts: 514
Location: Wisconsin
Effectively, the NEC covers all voltages. It does have a section on power limited systems which has limitations on voltage (usually <30VDC) and current.

It is only NFPA70E that has a defined cut off.


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