by Andrew Herrick » Thu Apr 13, 2017 12:57 am
Disclaimer: It's probably not a NEC code-approved procedure, but it sounds like a worthwhile McGyver project! Just shooting from the hip here, but I can't think of many applicable problems using PVC connectors ... I'm assuming all the wires are already jacketed, of course. I wouldn't run a bare ground wire through PVC. Technically, PVC doesn't weather as well as EMT conduit, but it's hard to imagine it failing any time soon!
I'm assuming you're particularly wanting to use flexible conduit, which rules out EMT conduit. Have you looked armored cable (MC)? I think it's ready for exterior use as sold off the shelf. It can be used with standard junction boxes, too. So if you're looking for a waterproof conduit solution, that might be easier than finagling with plumbing connectors and split loom. Then again, PVC is certainly cheaper.
Fun fact: A quick Google search mentioned that PVC is gaining headway in international use for electrical conduit. Sounds like you might be ahead of the curve!