I took my light out for the first time since owning the pool, figured it was time to get in there and clean and also for a general look around. There was a ribbed cord that supplies the power to the light- it was in good shape. Coming out of the same grommet in the housing as the light power cord, there was a single wire- green insulation with about an inch stripped off the end, about 8-10 inches long and I'd guess a #12 solid copper. The stripped end wasn't attached anywhere, nor did it have a loop in the bare end like it had been fastened to something. I didn't see anywhere on the light case or housing in the pool wall everything fit into that the wire had come off of. The light works fine.
I know green is the universal color for grounding in electrical work. Is this a ground wire for the light or could it be the pool end of the bonding wire ? The cord for the light is about the size of my little finger in diameter, I think it could hold 3 conductors for the light easily. I'd bet a nickle it was attached somewhere, but I didn't see any attachment point. Gave it all a real good feel and didn't find a screw (or hole without a screw) in the housing for a ground wire. In all fairness...the light is in the deep end and I was having trouble being able to get a super good look inside the housing due to wanting to float on the surface and not having my glasses on, only goggles.
Thoughts from the pool pro's ?