Quote Originally Posted by mas985
I agree that wet concrete is a good conductor on the surface, but when concrete gets wet, I could be wrong but I would not expect the moisture to get all the way down to the rebar which is 2-3" below the surface. The concrete surface is somewhat porous but not as much to allow moisture to get down 2". What I could imagine is that when the concrete cracks it could allow some of the moisture to reach the rebar and then it would make a difference.
Mark, in one of my past "lives" I worked in a government building where they would periodically test the concrete conductivity as an indicator for the corrosion to the rebar embedded in the concrete.

As it turns out, much of the world's population housing and the existance of skyscrapers, bridges, and even nuclear power plants, rests on the natural "miracle" of nearly exact coefficents of thermal expansion between rebar and concrete. Move over, Fibonacci.

But what worried me about ....(shading eyes to avoid embarassing direct eye contact of thread-hijacking complaints)......dsamples VINYL pool problem was that his vinyl liner is possibly masking some greater electrical fault that would normally trip a breaker, but doesn't because of the insulation-to-ground properties of the vinyl liner.

I'm not an electrician, but I would imagine that the newly required NEC "grid" requirements mentioned by John are a response to some poor soul's accidental electrocution by a situation very similar to dsamples current dilemma.

I hope it gets fixed, if only for the peace of mind.

STS