Grounding in 4800V underground system

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Leos98

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Westchester, NY
Hello,
I?m currently working on a design for a summer camp. The design consists of an underground 4800V delta system. The existing system is overhead but because of the damage cause by trees during past years we are proposing an underground system. The utility company brings the 4800V delta service to a pole outside the camp in which it meters the service and the customer overhead system begins. Our plan is to begin our underground service at such pole, run underground for about 150FT and then install a Sectionalizing cabinet from which we will tap to three different pad mounted transformers thru out the camp. We want to run 3-#2AWG, 8KV, shielded wire from OKONITE in PVC conduit from the sectionalizing cabinet to each of the 45KVA transformers. The question: Do I need to run a ground wire in each of those conduits? I?m pretty sure I do not have to because I?m setting my ground at each of the transformers but I have not been able to find something in the NEC that will backup my design.

Thanks!
 
I do not think NEC requires to run E.G. with Medium voltage system wiring. It is up to power utility company / designed engineer.
 
Thank you, after the response from "buckofdurham" I have been looking everywhere in the NEC why to install an equipment ground but no answers yet. Does anybody knows of a good forum for the National Electrical Safety Code (NESC)?

Thanks!

Leos98
 
leos -
I'm not familiar with the NESC so I can't help you there.

However from your posts, the service point is at the last utility post. All of the 4800D from that point on is subject to the NEC.

Have you read through article 250, section X. That specifically covers grounding of systems and circuits over 1kV. However, according to 250.180, section X only applies to grounded systems.

I'm not familiar with 4800D. I've never seen one. Is this a grounded system in any way. I've also never seen an outside MV system that was ungrounded. These are only two of the many things I've not seen --- yet:)

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