old house/2 prong outlets

I could be wrong but I think if there is no grounding wire already present and you need to run one it should be run right to the main panel where your breakers (fuses) are.

Hopefully a member will chime in who knows about this stuff.

 

when you install a GFCI, does that eliminate any stray voltage in the tank system?

 

No, when a gfci is tripped it only stops the current, going to whatever is plugged in, incase of a short or water contacting a bare wire or outlet. You would need a seperate ground probe, which is put into the tank then attached to the on the outlet ground, for stray voltage. From what I understand, inorder to hook up a gfci, you will need to run Romex 12/3 wire and you would need to run it thru the wall and to the breaker box. 12/3 is rated for a 20 amp breaker, if you don't have a 20 amp breaker, you will need to install one of those too.

here's a little info on wires... Common Cable and Wire Used in Home Wiring Projects you can ask the electrician aquestion there too....

When my hubby gets back from work, later today, I'll ask him to post a little about this, maybe he can clear up your confusion. He does hvac & electricity.....