 #36
Averagesupernova
Science Advisor
Gold Member
 4,543
 1,293
Ok, you are introducing a lot of things here. Simplify simplify simplify! Start by turning off the main breaker and ALL other breakers in your house. Measure the cable feeding your furnace. You may still have current showing. It's not uncommon for ground paths to carry current through the water system. It's not out of the question for it to show up someplace like this. If you do have current showing here there's likely little you can do about other than hunt around to verify the path.

Assuming the current has fallen to zero, start turning on breakers. Start with the main only. Watch your meter and turn on one breaker at a time while keeping an eye on your meter. Leave the furnace and A/C unit until last. Let us know the results.

Assuming the current has fallen to zero, start turning on breakers. Start with the main only. Watch your meter and turn on one breaker at a time while keeping an eye on your meter. Leave the furnace and A/C unit until last. Let us know the results.