I have an 800 amp service on a house. We are installing an 800 amp service disconnect that will feed 4 - 200 amp panels. The way it is wired now one parallel feeds 2 - 200 amp panels and the other feeds the other two. It was previously fed underground from the pad mount transformer to the house without a main. The conductors used was direct burial 350 mcm aluminum. Isn't that a little small? The power company is telling me that it will be ok to use 350 mcm copper from the transformer to the service disconnect. I'm thinking 400 at least....maybe even 500 mcm considering the distant from the splice to the termination point in a trough just above the 4 - 200 amp panels in the basement. That's probably about 175 feet of 350 aluminum ( in parallel). All terminations are going to be made in the transformer. Utility out to the 800 amp main and then, from the main back into the transformer, spliced and then on to the house. LOL!!!!....Is that clear as mud? LOL!!!!!
Is this proper and are they right or even close on the wire size?
Is this proper and are they right or even close on the wire size?