The other day I saw a mobile home wired with a 4/0 4/0 2/0-4 al feeder assembly. I looked it up on the net and sure enough they sell this cable assembly in this and in 4/0 4/0 4/0 2/0. They were both rated at 200A. I thought you needed a full size neutral and grounding conductor for a mobile home? What gives? Is there ever a reason that your allowed to downsize a neutral and grounding conductor? If there isn't why do they make this cable combination? Please explain with code references . Thanks
