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ungrounded 2400 volt feeders #218718
08/30/17 09:17 AM
08/30/17 09:17 AM
Yoopersup  Offline OP
Joined: Mar 2003
Posts: 840
2400 volt ungrounded customer owned feeder from OCP .
Run underground in PVC

, Equipment ground required ?? Shield as ground ???

2017 NEC Part X.
I'd prefer EGC. But I think Shield allowed in some cases.
Code section with answer Please.

If EGC required sized by 250.122.


2017 / 2014 NEC & Related Books and Study Guides
Re: ungrounded 2400 volt feeders [Re: Yoopersup] #218719
08/30/17 12:16 PM
08/30/17 12:16 PM
ghost307  Offline
Joined: May 2005
Posts: 934
Chicago Illinois USA
You would need to run an actual ground conductor.
The shield won't do the job.
Yes; size it per 250.122.

Although technically the NEC doesn't mandate that you ground the 2400V system; I have always run a ground conductor...even if later someone tells me to not connect it.

Re: ungrounded 2400 volt feeders [Re: Yoopersup] #218722
08/31/17 12:58 PM
08/31/17 12:58 PM
gfretwell  Offline

Joined: Jul 2004
Posts: 9,184
250.4(B) talks about grounding equipment on ungrounded systems. Although it does not specifically reference 250.122 it is implied as a good guideline with these words

250.4(2) Bonding of Electrical Equipment. Non–current-carrying conductive materials enclosing electrical conductors or equipment, or forming part of such equipment, shall be connected together and to the supply system grounded equipment in a manner that creates a low-impedance path for ground-fault current that is capable of carrying the maximum fault current likely to be imposed on it.

Greg Fretwell


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