He said something about the secondary tap of a trans you could drop wire size by 10%, which didn't make much since to me considering that wire from the tap to the main brkr is technically nothing more than a fuse link. Thanks for the nec references, that's just what I needed.
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...
