Originally Posted by dirtpoor
I have a 370' run from single phase 120/240, 25KVA transformer for 400 amp service. Someone told me I need (2) sets of 500 mcm to keep my Vd below 3%. I know (I think) that I have two hots and one neutral coming from the transformer (3 conductors).
My question is this/these: What is a "set"? Is a "set" just bundles wires and considered one wire or is a set of 500 mcm more than one 500 mcm wire? Do I need only two 500 mcm cables and then another for a ground? Thank you in advance.
I believe they are saying two runs per phase, or six plus a ground. 2-L1, 2-L2, and 2- N, plus an undersized single ground.