Protective Grounding-Set Tester (Hubbell)

This 8-minute video shows how to test grounding sets — grounding clamps and their interconnecting cables. To perform the test, grounding sets are clamped on posts on the tester, and the tester measures the resistance through the entire assembly. The resistance measured should be only a few milliohms. Troubleshooting techniques are demonstrated, in case the resistance is higher than a preset minimum.(Courtesy Hubbell)