Greg,

I have only seen the problem of stray voltage with the fiberglass pools. No others. However a long time ago in a far away place... smile I was working with my old boss ( back in 1977?) We were working with an old built in pool and there was problems with voltage I believe. However being a 1-3 year apprentice, I did not know what was going on. Some of the old pools around here were concrete but no rebar. Most didn't have bonding wires around them either and they also use to use brass conduit to go to the wet niche.