Both the National Fire Protection Association (NFPA) and IEEE recommend a ground resistance value of 5. It is a test done to measure the resistance between a grounding electrode and earth. Specialized earth testers, like the Fluke 1630-2 FC Earth Ground Clamp and the Fluke 1625-2 GEO Earth Ground Tester, are the troubleshooting tools built to make earth ground tests a lot easier. 1 This Engineering Recommendation forms part of Annex 1 to the Electricity Distribution Code and titled Engineering Recommendation No. Each DISTRIBUTION BOX and controller must be grounded. 26 mm 2 (10 AWG) ground wire must be used, and in all other markets a 6 mm 2 must be used. Grounding of the units: Attach a ground wire from one of. The simplest and somewhat misleading idea of a good ground for an electrical system is a section of iron pipe driven into the earth with a wire conductor connected from the pipe to the electrical circuit (Figure 1).
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