Ray, Thanks for the info. The transformer I’m using is one from a recent Orbit 4 station controller, and it is likely fused. I’ve never had a wiring problem, so I think I’ll live dangerously and skip the fuse. I’m glad you removed the resettable fuse as it would likely be a headache here. I expect the temp in the box will be about 120 deg F during the summer, with the transformer, controller, and a power line Ethernet adapter adding heat and an outdoor temp of 110+ deg F. And that is without any direct sunlight on the box.