25kv delta/480v wye trans
25kv delta/480v wye trans
(OP)
At our coal mine, we use 25kv/480v trans for our dewatering fields. When recently wiring up a new panel attached to the secondary on said transformer, my boss told me to wire from the secondary tap to the 400A main with parallel 2/0. Coming from construction, I know 2/0 is only good for 200A on residential service entrances. I don't feel comfortable doing this because, 1) I don't feel the paralleled wire sizes are big enough, 2) to do this it must be double lugged to back feed said breaker, 3) he also told me to grnd with just a number 2, which I know is nowhere near the circular mills required to feed a proper 400A service. Anyone got any opinions, code references to help me out?






RE: 25kv delta/480v wye trans
I'm not sure where the panel is with respect to the source, but the feeder must have proper overcurrent protection at the source or must be installed per appropriate tap rules.
Alan
"The engineer's first problem in any design situation is to discover what the problem really is." Unk.
RE: 25kv delta/480v wye trans
RE: 25kv delta/480v wye trans
Bill
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"Why not the best?"
Jimmy Carter