As a new pool owner I have been working on getting my pool operational. I have my new pump and filter ready to install and have realized that the subpanels in my filter room are in rough shape from years of chemical storage. Now that I have gone in and cleared out the old R-22 heat pump equipment from the filter room I can't find any evidence of bonding. I would like to get everything setup safely and am wondering if anyone has advice for adding bonding where there doesn't appear to be any. The pool is enclosed on 3 sides (formerly an indoor pool). There is a bare copper ground wire running from the subpanel into the concrete and another bare copper ground wire from the underwater light junction box running into the concrete. Otherwise I can't find any other copper wires.
I have seen some posts mentioning sawcutting the concrete to lay a bare copper wire. Any advice on this? Does the bonding wire need to be connected directly to the light niche? Does the wire need to go around the entire pool or just connect between the light, ladder, pump and heater? How deep does the wire need to be in the concrete?
I need to find an electrician to put in a new subpanel and want to take care of the bonding at the same time so it is most importantly safe and will pass an electrical inspection for permitting. In addition, the current grounding is questionable and there aren't any GFCI's. The house was built in 1975 and it is an in-ground fiberglass pool.
EDIT: The niche is currently empty and for now at least I do not plan to install an underwater light.