Light installed today, a few questions if you would indulge me.
-We found the bonding wire, here itis with some black electric tape and a yellow cap on it, otherwise you can see it is a solid copper wire. This photo also shows our new PVC conduit where it attaches to the old red brass conduit with a hose clamp. You can see the copper water line to the pool crossing just under all of this.
-I bought an LED light with a 50' cord so we could take it all the way back to the new subpanel.
-We only had to dig down a few inches and it was easy to pull the cord through, so the metal pipe was left up to the level of a couple of inches below the water line.
A. The bonding wire, should it be #8? Should it be solid or is stranded OK ?
B. Should it go all the way back to the subpanel also? (Ie. not "grounded" to anything else but same as the light.)
C. Metal to PVC was tight fit and had to split end of PVC to start it onto metal. Is there anything we could put or spray around it to make sure it stays sealed for ever and ever ? Epoxy putty for example ?
Next issue is the subpanel and boxes. I don't see a ground from the subpanel, although I know there is one on the main panel. There is a 110 GFI outlet coming from the subpanel. The light switch is taking power off of that GFI outlet. Here is a photo of the setup. (I don't see a ground wire from the GFI outlet either.)
Does that fact that we came all the way back to the GFI outlet mean that we don't need a separate junction box apart from the switch box ? Or is the box that the switch is in actually the junction box ?
Does the subpanel need a ground wire ?
Does the outlet need a ground wire ?
Does the light switch box need a ground wire?
I realize these are simple questions but I don't like to take anything for granted when it comes to safety and I have no concerns at all about appearing ignorant (I freely admit it !

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Thanks again everyone for your gracious help !