To ground or not to ground

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steve66

steve66

Senior Member
Location
Illinois
Occupation
Engineer
I am running a 4160W 200A feed from an overhead line down a pole to a transformer. Do I need to run a ground wire with the primary conductors? (Not sure if there is or should be a ground wire ran with the overhead feeders?)

(If you are getting a feeling of Dejavu, this is about the 3rd question I have asked about this feeder :confused: I don't do much MV!)
Thanks:
Steve
 
Re: To ground or not to ground

The primary would be a delta.
Secondary will be a grounded wye.


Steve
 
Re: To ground or not to ground

Steve, Wouldn't that come under POCO's requirement decision? Check with them first.
rbj, Seattle
 
Re: To ground or not to ground

If you are installing the conductors down the pole and if they are under the scope of the NEC (where is the service point), then the rules are in Art 250 Part X.
 
Re: To ground or not to ground

Its not the POCO's overhead lines or xformer. Customer has their own OH distribution.


I don't see the answer in Part X. Since the secondary of the transformer will have its own ground rod, can the contractors just connect the transformer case and the MV cable shields to that ground rod? Of do I need to carry a ground down the pole?

I guess I will error on the side of caution and show a ground wire ran with the MV cables.

Steve
 
Re: To ground or not to ground

Sorry I was pretty sure it was in part X, but this is not my area of experience.
The person who would really know is our moderator Charlie, who is on CMP10 for Art 230 and works for a POCO. But he is taking a break from the forum...
 
Re: To ground or not to ground

It may be in part X, but if so, I can't decipher it. It's not really my area either.

I've noticed Charlie's absence. Hopefully, he will be back sometime soon.

Steve
 
Re: To ground or not to ground

eeee - doesn't matter if it is a delta or a wye - we are talking about equipment grounding (bonding).

steve - Article 250 is not very clear for over 600V. but IMO same basic principles of equipment grounding (bonding) apply to over 600V. installations. IMO it does exempt some isolated equipment from the bonding though.
 
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