When am I required to use PVC expansion couplings...do I need them for the service I described in the PVC Service thread? I always use them at residential services on poles, but here I have block buildings and the 4" conduits come out of well compacted asphalt over gravel parking lot.
By the way, yes, I do have a code book...but you guys are just so darn accomodating.(LOL) Thanks for the input!
