Ground Loop?

oldrocker52

When the outlets were installed, I used in wall 20 gage AQ power wires.

On a 15A line? Are you in the US? That isn't even close to code where I live.

I've lifted the ground on both and individually with adapters.

That also sounds problematic.

Do you have any other metal to metal contact going on?  Like via your shelf?

One other thing to check is that you have a good neutral.  Use a multimeter to test from Neutral to Ground.  Should see no more than a couple of volts.

Cleeds is correct. At 20 awg, you aren’t even close to a 20 amp code requirement. For a 20 amp circuit, you should have at a minimum, 12 awg wire. Personally, if this was a custom job, I would run 10 awg stranded wire in metal flex conduit. Again, I’m not a certified electrician but you may have much bigger problems than the ground. How long is the run of AQ 20 awg wire? Is the AQ wire rated for 20 amps at the length of your run? For your sake, I hope the electrician verified all the specs before installing the two circuits. Worse case scenario, one or more wires will heat up and possibly cause a short or fire.

I want to thank everyone for their input. It’s not 20 gauge now that I think more about it, it was done 12 years ago and the 10 gage sounds more familiar. The wire was made for this application. I had an electrician install the wire, breakers and receptacles to code. The run is only about 10-15 feet at most. Even so I plugged 1 at a time into a regular receptacle, 1 in the dedicated line and 1 in the regular socket then both with no change. So, I don’t think it’s in the dedicated receptacle and another regular outlet do the same thing. I’ll get my neighbor to check ground and stuff, he knows more about A/C than I do.