underground pvc expansion question


Old 06-23-05, 11:48 PM
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underground pvc expansion question

i'm running 1" sch40 pvc about 200' underground. at each end, the 90 and the stub will be rigid metal. the straightest section is about 100' long, with a couple of 45's and a sweeping arc along the rest of it.
do i need expansion joints? i live in maryland, so the temps range from a bit below freezing up to the 90's. but it would seem that the changes in direction and the lack of any straps or anything would allow sufficient expansion and contraction.
if i need them, where's the smartest place to put them?
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Old 06-24-05, 09:00 AM
Join Date: May 2001
Location: Dry Side of Washington State
Posts: 738
Here's your answer.


I use expansion fittings in underground installations where I live because the ground can freeze up to 18" deep. I also use expansion fittings when the pvc conduit comes up through concrete. I've seen rigid metallic conduit that comes up through concrete separate from a j-box.

Last edited by thinman; 06-24-05 at 09:31 AM.

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