Unless you expect the ground temperature at that depth to be subject to large
changes, it is unlikely that expansion/contraction will be an issue. For
example (from NFPA-70, Table 352-44) the length change for rigid PVC conduit
for a 5 degree F temperature swing will be 0.20 inches per 100 ft....when NOT
buried. For long runs it is advisable to not run it perfectly straight, to
allow for any small amount of movement.
73
Don
WB2BEZ
In a message dated 11/4/2017 12:37:52 PM Eastern Standard Time,
00tlzivney@bsu.edu writes:
My conduit run between towers will be 3 to 4 feet deep and 200 feet long.
2 inch nominal PVC conduit.
Should I use an expansion joint underground?
Are they truly waterproof?
Terry N4TZ
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