PVC S80 on a Rooftop

[Jsim4109]

We have recently installed Schedule 80 on a rooftop for combiner box output circuits. All of the combiner boxes and conduits are mounted on dura block style supports. Nothing is fastened in place. Do we need to install expansion fittings in the conduit runs?

 

[StarCat]

Sch.80 PVC

Sch.80 PVC

My experience with using this product in any exterior surface mount situation is not good and its application envelope is definitely limited.
It is especially intolerant of strong sunlight such as experienced at altitude in the Mountains. IN these cases it tends to warp, sometimes fracturing and it discolors quickly. Larger sizes seem to have a bit more stability, but even then our preferred method is only to use it for underground and then transize above ground level as quickly as possible.
Generally more anchor points are desirable, but direct sunlight can make it go over the edge.
Also 80 may be worse than 40 in this regard.

 

[kwired]

We have recently installed Schedule 80 on a rooftop for combiner box output circuits. All of the combiner boxes and conduits are mounted on dura block style supports. Nothing is fastened in place. Do we need to install expansion fittings in the conduit runs?

You could always come back in a year and find out that you should have taken expansion into consideration:blink:

As mentioned PVC is not the greatest option to use in such an area, sometimes the best way to learn is to see failed installations firsthand.