Fault Current
Fault Current
(OP)
To get all my switchgear and transformers in compliance with NFPA 70 (NEC 110.16) as far as getting labels indicating arc flash hazards and giving appropriate PPE levels, what is the formula for calculating fault current -at the main and at subsequent sub-panels? Also, can I calculate fault current for my pad mount transformers (12470/480)? I believe the impedenace (Z%) is on the transformer label. Also, is bolted fault current the same? Thanks, Jimi





RE: Fault Current
No calculation needed.
If you want to comply with NFPA 70E, then you need many calculations, well in excess of just the fault current.
RE: Fault Current
arc-flash:
http
Although a lot of fault-calculations are done these days with software, this file can help you with manual calculations:
http://68
RE: Fault Current
Mike