I did a 400A 500 cu kcmil 3ph riser in 4" Sch 80 a while ago. Used beeline & 4" conduit clips every 24" .
The steel clips do not allow for the expansion of pvc, and are not listed for it's use.
But the plastic clips are whimpy, and this riser's 4-500's wieghed out to more than they are rated for!
Me....I'd rather see the pvc pull apart than fall off the building
[This message has been edited by sparky (edited 04-27-2001).]