Originally Posted by

**oldsparky52**
I'm just a home schooled non union electrician so if my thoughts are dumb, just tell me.

1st thing I thought of is you have a parallel path from each service at the building back to the transformers feeding those services. I assume they are fed from the same PoCo distribution circuits. I wonder if there is enough of a current path from all of the bonding and grounding (both PoCo and building premises) for that parallel path to be a low impedance path between the 2 supply transformers? (I hope my thoughts are conveyed well).

2nd thing I thought of was how much voltage would it take to push 15 amps through that #2. Let's assume it's 500' of conductor (a guess since I don't know how far it actually is). #2 has a resistance of 0.000194 ohms/ft. VD=IR, so I = 15 and R = .097 (500*0.000194). VD=1.46. So all it takes is 1.46 volts to push 15-amps through that #2, so if you disconnected the #2 in one spot, you should read about 1.5 volts. If the distance is 250', then your voltage reading should be about 0.73 volts. Not much.

How much neutral current are on the services when you read the 15-amps on the #2? Have you established that there is a relationship between the amount of neutral current and the current on the #2? Could it just be a parallel path for neutral currents back to the PoCo transformers? IDK.

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