Equipotential Grounding Test Failing

[Shujinko]

I have a project in a hospital in a CT Scan Room where the equipotential grounding test is failing. It is only failing at the arm of the a multi joint arm mounted injector. The arm is mounted to a uni-strut structure above the ceiling. This uni-strut structure is grounded. However, the arm itself does not have it's own bonding conductor. Would the solution be just running a bonding conductor directly to the arm? Or could the actual mounting arm be an issue? Has anyone run into this? If so, how was it resolved? Thanks.

 

[roger]

We run into this type of situation pretty frequently. The way I handle it is I simply make a note on the report that the field installed wiring to the equipment has met the <.1 ohm requirement but the manufacturers equipment is --- ohms, then let them take it up with the AHJ. It is not a good idea to do any field modifications to any piece of medical equipment, the liability is way to great.

Roger