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JBK89UT
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Post subject: Short Circuit Rating of Equipment less than 50Vdc  Posted: Fri Sep 21, 2012 5:51 am |
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Joined: Thu Oct 27, 2011 5:00 pm
Posts: 5
Location: Vermilion Ohio
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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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JBD
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Post subject: Posted: Mon Sep 24, 2012 2:15 pm |
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Joined: Mon Jan 18, 2010 11:35 am
Posts: 557
Location: Wisconsin
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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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