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#34989 03/01/04 09:59 PM
Joined: Apr 2002
Posts: 257
M
Member
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?

#34990 03/02/04 02:25 PM
Joined: Dec 2003
Posts: 751
E
Member
PVC clamps are manufactured for this purpose.


Earl
#34991 03/02/04 02:49 PM
Joined: Oct 2000
Posts: 2,749
Member
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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