sub panel grounding
I've got a question, and I hope that I explain this right...
My house has a 3 breaker box directly under the electrical meter on the side of the house. One breaker is a 30amp breaker that feeds only the electric clothes dryer. Another is a 40amp breaker that feeds only the air conditioner compressor on the outside of the house. The other is a 60amp breaker that feeds the breaker box in the house.
Originally, the breaker box in the house was only being fed one 110v feed from the main box outside. I have since run a 6-3 (w/ground) from the main outside the house to the breaker box in the house. I have separated the neutral and ground inside the breaker box in the house since technically this would be considered a sub-panel (correct?). I only have around a 35 amp draw on the breaker box in the house with all the lights and appliances on since the dryer is on another circuit, the A/C compressor is on another circuit, and the stove and water heater are both gas.
During my rewire of the breaker box in the house, I started to discover with my volt meter that some of my neutral wires showed a connection with ground wire even with all the wires disconnected inside the breaker box. (ie, the wire feeding the receptacle where the satellite receiver is plugged into, even with the neutral of that wire disconnected, still shows a connection to the ground feed wire from the main box outside, even without the ground wire being connected to the ground bus inside the breaker box inside the hosue).
One in particular is the circuit that feeds the receptacle that the air handler plugs into inside the closet where the air handler is located. I had the air handler completely unplugged from the receptacle, along with the ground wire that connected to the main box outside (again, the neutral and ground are not connected inside the breaker box in the house).
I am nearly positive that the ground of the air handler is also picking up the ground via the copper lines from the compressor outside, which is on a circuit independent of the breaker box in the house which is where the air handler derives it's power from.
Is this normal? Is this just an accepted way of dealing with a ground loop, or do I need to re-wire things to where the air handler is on the same feed as the compressor back to the main box outside the house to eliminate a double ground?
I hope this made a bit of sense...
Last edited by bcarl; 01-22-2011 at 01:26 AM.