I just returned from a call where the complaint was intermittent shocks being received from the plumbing. I proceeded to amp out the neutrals and GEC. When the air handler is running there is 7 amps returning from the sub panel to the main neutral bus. However, 2 amps of the 7 leave thru the GEC which is bonded to the water pipe. The other 5 leave thru the main service neutral. I re made all the neutral connections in the panel, meter base and weatherhead. There was no change. My thought is a high resistance connection at the pole mounted transformer, so I called the utility to check.
I ruled out any interior connections as the full 7 amps appears in the sub panels neutral, it does not divide till the main.
Barring a hot wire touching a pipe somewhere, am I on the right track here?
