ECN Forum Forums General Topics of the Trade Non-US Electrical Systems & Trades Live Bath

Cool,
I'm certainly glad that that has been solved!.
It's strange how a system that is installed to protect people against shock can cause a thing like this to happen.

Indeed. Makes you wonder whether the recommended (or required-by-code) approach is always the best, doesn't it?

You would have appreciated some of the discussions I had with Bennie Palmer a couple of years ago. We exchanged a good many messages on the subject of bonding vs. isolation and grounding issues.

how did they measure this`?

Cant see this for the life of me! I would be amazed if bath water in waste could introduce earth potential, or any other potential for that matter. A 1m column of water with a high degree of disolved salts in a 15mm plastic pipe will have a resistance of circa 30,000 ohms! I can see however, that a poor neutral connection in neighbouring premises would increase potential between bonded bath and floor, which may be more representative of true earth. May be reasonable to sink spike to reduce touch voltages on pme systems where neutral problems will always exist.