I did a bit of reading and the consensus is there are listed wet location assemblies. The parts have to be evaluated together similar to a fire rated wall. I bet Paige has some detail drawings of how to put their parts together in a wet location. The GTO itself seems to come in several varieties, some with an integral sleeve. The U/L marking guide says it will say that right on the jacket. I get the impression the problem is not the wire, it is the penetrations and terminations.
