Is Gas Pipe Grounding Legal? You must not use an underground metal gas piping system as a grounding electrode. So, what's the confusion all about? The controversy behind bonding and grounding metal gas piping systems arose when many electrical professionals questioned the rules and regulations of the National Fuel Gas Code (NFPA) 54. For example, Sec. 3.14(a) in NFPA 54 requires each aboveground portion
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