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?
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