Hard to believe the THHN-THWN is good for wet locations since the wires corroded and shorted out. I had to replace them. I somehow have to seal off the PVC so water won't get into the pipe again. Seems to me it should be like a round floor outlet box - completely sealed. Low voltage may be ok for this, but can't see how 120v could be safe or code.
I've seen the power companies use these green boxes underground for splices from their transformers. Guess they have there own code.
