Using a menralac one hole pipe clamp with a uni-strut nut will allow securing to the uni-strut in any direction, and I agree the NEC allows wire ties to secure conduit, but the problem with PVC is expansion, like vinyl siding it must be allowed to move, this means the straps or clamps used must allow the pipe to slide through them, and expansion joints must be used when runs are over a certain length, or you wind up with a spaghetti mess. 352.30
Originally Posted by ssandoval
When a job call for exposed PVC I tend to install more supports than the code requires, to keep it running straight table 352.30 allows 1/2"-1" to be supported every 3' on 1/2" I do 2' supports, I even go over board with expansion joints, when the conduit is between fixed points, or 90° turns, but here we can have over 90° temp in the summer and go down to -10° in the winter.
Inside runs are not as much a problem in a controlled environment, but it does seem to shrink over time when exposed to high temps, which can pull out of boxes and fittings.
Wayne A. From: N.W.Indiana
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