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-   -   use of expansion joints (http://www.diychatroom.com/f18/use-expansion-joints-134236/)

farmer56 02-19-2012 11:04 AM

use of expansion joints
 
does 2011 nec code book require the use of expansion joints on any pvc conduit run or just pvc in the ground?

Code05 02-19-2012 11:43 AM

Quote:

Originally Posted by farmer56 (Post 857308)
does 2011 nec code book require the use of expansion joints on any pvc conduit run or just pvc in the ground?

Both.How long is your run?

352.44 Expansion Fittings. Expansion fittings for PVC
conduit shall be provided to compensate for thermal expansion
and contraction where the length change, in accordance
with Table 352.44, is expected to be 6 mm (1⁄4 in.) or greater in
a straight run between securely mounted items such as boxes,
cabinets, elbows, or other conduit terminations.

bobelectric 02-19-2012 11:48 AM

Code has tables for types of conduit and expansion at different temperatures.

farmer56 02-19-2012 01:19 PM

about 40 feet. looks like i have to slip them in there. thanks for clarifying that. wont to that again!

farmer56 02-19-2012 01:27 PM

put expansion joint in my first run , from transformer to service disconnect. from the service disconnect to distribution panel i did not.since my disconnect and distribution panel were both sittin on the same slab of concrete i didnt. years ago i am sure that would of been kosher but i should of checked this out. will be fun to wrestle that 4/ 0 again. i need to invest in new code book. thanks for your reply and help.

rongiambrone 10-02-2012 05:46 PM

When to use expansion couplings
 
i ran 22' of 1" pvc conduit. what determines weather i need an expansion coupling or not? does the NEC have a formula to determine this??


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