Testing for earth ground resistance is essential for two important reasons: safety and equipment uptime.  Without an effective grounding system, fault currents have no safe path to ground, and those current will find unintended paths that could include people.  Poor grounding is also a cause of poor power quality.

This document from Fluke explains why and how to perform earth grounding resistance tests, and shows how regular earth ground testing can improve both safety and uptime.

 

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