I upgraded the service to a house and installed a meter/panel combo at the service entrance, ran 4 wires to the original main panel in the basement which became a subpanel, split the grounds and neutrals in the new subpanel, bonded to the water and gas from the main and while tying in the grounding conductor in the subpanel, I noticed arcing as it came close to the terminal. I put an amp clamp on it and found current fluctuating around 2 amps. It changed as I turned off different 120 volt breakers. Then I turned off the power at the main and subpanel and found the amperage to be around 1 amp. I read another posting about current on the GEC relating to a poor nuetral at another house that's also bonded to the water line. Could this be what I have going on and should I be concerned about the current changing as different 120 volt loads come on and off?