Calculating Primary URD

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mxeng10

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Hi All, Glad to be on board!

I am trying to Calculate a Primary URD conductor. The power utility company will not allow anything less than a 15kv #2 wire, which the load is far to big for anyway im sure.

It's a 3-PH feed, right now a 300 amp load, but will go up to an 800 amp load @ 277/480 to accomodate future expansion. There is a 750 kva xfmr we will use to accomodate any load needed. The primary urd will be about 300' long.

Thanks!
-MX
 
Not sure what you are asking exactly. What is the primary voltage? 13.8kv? 2.4 kV? I would think you need the utility help given it's their standards.

Regards,
 
If you are trying to determine a conductor size, the max load on the 750 kva
is 35 amps at 12.46 kv. #2 AL will be rated at about 130 to 150 amps depending if its in conduit or direct buried. Info from Okonite Catalog.
 
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