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#34989 - 03/01/04 09:59 PM PVC Expansion  
master66  Offline
Member
Joined: Apr 2002
Posts: 257
Masontown, PA, USA
I have a job where I have to install some 4" PVC and 2" PVC under a bridge.

There will be 90 degree bends on each side and the bridge, which is appx. 100 feet long, has an expansion joint in the middle.

I will be hanging the conduit with beam clamps from structual steel under the bridge.

What would be the correct clamps or combination of clamps to use to allow the conduit to move?


Work Gear for Electricians and the Trades

#34990 - 03/02/04 02:25 PM Re: PVC Expansion  
earlydean  Offline
Member
Joined: Dec 2003
Posts: 751
Griswold, CT, USA
PVC clamps are manufactured for this purpose.


Earl

#34991 - 03/02/04 02:49 PM Re: PVC Expansion  
Joe Tedesco  Offline
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
See also, Table 352.44(A) provides the expansion information for polyvinyl chloride (PVC).

Table 352.44(A) Expansion Characteristics of PVC Rigid Nonmetallic Conduit Coefficient of Thermal Expansion = 6.084 × 10-5 mm/mm/°C (3.38 × 10–5 in./in./°F)


Joe Tedesco, NEC Consultant


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