gserve
Senior Member
- Location
- New Hampshire
Would a expansion joint be required under a mobile home where the feeder PVC merges from the ground to the homes feeder conduit?
expansion joints
- Thread starter gserve
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charlie
Senior Member
- Location
- Indianapolis
Re: expansion joints
You have to answer that question yourself depending on the area in which you are located and the temperature range you expect. See section 352.44 for the instructions.
You have to answer that question yourself depending on the area in which you are located and the temperature range you expect. See section 352.44 for the instructions.
Re: expansion joints
However, if frost lifts the slab on which the mobile home is mounted you will have a few problems besides a broken conduit.
You do not want to bury an expansion joint in the ground. In at least 1 mobile home park around Akron, Ohio tree and grass roots have penetrated O-ring gasketed joints in PVC sanitary sewer pipe. A PVC or steel conduit expansion joint also has similar O-rings.
What I would do is to put a sleeve around the feeder conduit where it emerges from the slab so that there is no solid connection. I would then run liquidtight nonmetallic conduit from the rigid PVC stub to the conduit that goes from the underside of the mobile home to the pnaelboard. I would also use a PVC pull box between the rigid PVC and flexible PVC conduits. Flexible PVC conduit has a very high coefficient of friction.
However, if frost lifts the slab on which the mobile home is mounted you will have a few problems besides a broken conduit.
You do not want to bury an expansion joint in the ground. In at least 1 mobile home park around Akron, Ohio tree and grass roots have penetrated O-ring gasketed joints in PVC sanitary sewer pipe. A PVC or steel conduit expansion joint also has similar O-rings.
What I would do is to put a sleeve around the feeder conduit where it emerges from the slab so that there is no solid connection. I would then run liquidtight nonmetallic conduit from the rigid PVC stub to the conduit that goes from the underside of the mobile home to the pnaelboard. I would also use a PVC pull box between the rigid PVC and flexible PVC conduits. Flexible PVC conduit has a very high coefficient of friction.
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