11-29-2007, 05:58 AM
The resistance only gives an indication of how good an electrical conductor lies between the two ohmmeter probes. If the resistance is zero, then there is a good conductor between the probes. If it is infinity, then no electrical current can flow between the two probes. All the resistance meter did was verify that your "ground" wire was electrically attached to the rack. However, it doesn't sound to me like your device is grounded at all. If the rack is on rubber wheels and there is no metal conductor (i.e. wire) going from an unpainted part of the frame to the grounding pin of a grounded outlet (which will be grounded to earth if installed properly, then your gizmo is not grounded. That may be why you are getting zapped. You are the path of least resistance to ground. In any case, a ground is generally a safety feature that doesn't get used unless there is a fault in the device being grounded. Sounds to me like you have some issues. This could be serious if you are playing with line voltage.