We are presently building a new church auditorium. Before the floor is poured I want to run a few raceways to various locations to ease in the distribution of branch circuits. The ceiling height will be 22' at its' highest and I don't want to feed overhead unless I have to. If I interpet the code correctly, non-metalic raceways are permited in Art. 520-5(a) as long as it is encased in at least 2" of concrete. What I cannot find is how much exposed PVC is permitted to be stubbed inside a wall before converting to metalic conduit, if it is permitted at all? Or do most of you just stick with GRC?
My second question is if I use GRC I don't have access to a pipe threader. How dependable are the compression type of GRC connectors. Most of my experience has been residential so I don't have a chance to work with rigid that often.
Happy New Year to All and Thanks,
Mark
