Grounding 03
Grounding 03 : Article 250-75 of the 1990 National Electric Code requires bonding of metallic parts metal raceways, cable trays, cable armor, cable sheath, enclosures, frames, fittings, and other metal non-current-carrying parts that serve as a grounding conductor even if a separate grounding conductor is used. The methods and equipment used must be able to maintain high integrity low impedance ground when used with a circuit using shunt Zener diode barriers as interface between the hazardous and non-hazardous area
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