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Fault Current

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

If you are looking for compliance with the NEC, you only need a label that says "Warning: Arc Flash Hazard Present"
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

You might want to get a copy of the new IEEE 1584 standard.

Mike

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