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Closeup of Slipfitter
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This is a closeup of the slipfitter on my M-250r2. As you see I used the 4 bolt slipfitter instead of the 2 bolt.
And I also put that bug protector that came with my M-400 a2 on it so no more moths get in it and clutter the fixture. (Mostly for the summer)
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But I DO know EMT is not permitted underground.
The THWN is PVC-based, so it necessarily acts differently under sunlight. I don't remember if it's permitted under these conditions though, but I think it is.
The RWU-90 is probably the best for outdoor applications. There also exists the the RW-90, with the only difference being not to be permitted underground.
Jace, the liquid-tight is a flexible metallic conduit with a layer of flexible rubber over it. It uses special connectors that I did use back before Xmas. Once assembled, the whole connectors/conduit thing is 100% liquid tight. However I think the Canadian code won't allow runs of liquid-tight longer than 1,5m (~ 4,5ft), with some exceptions.