What size conduit is Min. for 4/0 Ser cable? Is 2" sufficiant? Just from the disconnect to the Crawl Space? I guess what I am asking I have already ran 2" from Disconnect to an 2" LB 36" then a short stub to under the house. Is there enough room to get 4/0 ser in the 2"... I had origianally planned to use 2/0 copper cable but didn't realize it was special order..