Ground fault on XFMR secondary with out a proper GEC

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Isaiah

Senior Member
Location
Baton Rouge
Occupation
Electrical Inspector
What happens on an ungrounded MV delta delta 2000kVA XFMR - 3 ph 3 wire if there is a ground fault and the XFMR secondary DOES NOT HAVE A GEC?
 
Isaiah said:
What about the Nec requirement 250.30(B)?


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The GEC and the EGCs on an ungrounded system are there to provide a fault clearing path when there is a second ground fault. They really don't do anything else on an ungrounded system.
 
Isaiah said:
We can’t guess - Nec requires it for a reason


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Electrical equipment is bonded to ground to reduce damage from nearby lightning strikes. In a grounded system, it also serves as a path to trip an OCPD in case an ungrounded phase becomes grounded.

But "What happens to an Article (when whatever happens) ?" I guess I don't understand the grammar. Like, does that page in the NEC catch fire or something?
 
don_resqcapt19 said:
The GEC and the EGCs on an ungrounded system are there to provide a fault clearing path when there is a second ground fault. They really don't do anything else on an ungrounded system.
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Don, it appears the GEC can also be installed at the downstream switchgear if I’m reading 250.30(B)(1) correctly. Both are located indoors and within a few feet of each other.


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