Sometimes find the total distribution cabinet PE line with Clamp measured several amperes of current, the UPS input distribution cabinet PE line clamp larger current. There are several reasons:
1, poor equipment grounding or ground wire is too small, due to the high resistance;
2, the device leakage through the housing
3, the system blend, blend neutral and ground electrical equipment, when the three-phase unbalance greater the more serious.
Elsewhere ground to the system ground together, here pile import. This case disconnect the system master switch, the geodesic current shows.
5, ground 10A current basic is not terrible, as long as there is no voltage on the ends of the earth pile that is safe, it is normal, because sometimes interfere with the current.