I ran into a bathroom sink in a grocery store a few years ago, where the faucet was connected to the main plumbing with those flexible polybutylene lines.
The faucet was causing a rather painful shock.
Never really found out why it was becoming energized, though. A #12 jumper from the CU to the faucet itself stopped the shocking, though.
I often wondered how that was possible, as the faucet was connected only to the porcelain and the PB water hoses.
What are the chances that it was being conducted by the water in the piping, rather than the piping itself?
Doesn't make sense. The water supply was "city water", and there was only one faucet out of about twenty (throughout the store) that was effected.
The building was only a few years old, and there was never any shocking problems from anything else in the place...
Things that make ya go "HMMM".
