I am not a stranger to stray voltage problems in sumps. Normally it is pretty easy to troubleshoot with a voltmeter, but I have had an intermittent problem that has been making me crazy for months.
I have a big power strip connected to a GFCI outlet about 3 feet above my sump.
Into that outlet, I plug in two EB8s, and a couple of powerheads and my grounding probe.
I was getting getting 16 to 30 VAC in the sump, but when I upplugged the individual components from the EB8 it would not go away. But when I uplugged the EB8, it went down to 0.1V. Then when put my grounding probe back in the sump, the voltage went back up to 6 !?!
I plugged the EB8 and the gounding probe into an extension cord on another circuit. The stray voltage stayed at 0.1.
So apparently it has something to do with the powerstrip, but I am at a loss to understand how that could happen. I have another EB8 plugged into that strip but I do not get the same problem. I don't want to replace the strip until I can understand what it is I might be fixing.
Anybody got a clue?