I'm putting electrical conduit underground and there seems to be mixed opinions on whether to use primer along with the PVC cement. There are videos showing the use of primer, and videos not using it.
In the electrical aisles at Lowes or HomeDepot they display Oatey Medium Gray PVC cement but not primer.
The directions on the Oatey medium gray cement do not say anything about using primer.
The Oatey web site for this product type has a video using primer, but it's just some generic video.
I understand that primer is necessary for plumbing PVC because it's important to have a high quality watertight seal, but that is not as important for electrical conduit.
Which makes me wonder how much moisture can electrical conduit tolerate running THWN wire? Seems like you would not want standing water in electrical conduit, but maybe it does not matter and the conduit is solely for protection thus the joints need not provide a completely water-tight joint.
It wouldn't matter if primer was used along with the cement, right? It would make for a better seal. But from a practical point of view, why bother if it is not necessary.
Is there some condition where you would need to use primer, like around a pool?