Q. Does the Code have any special requirements for grounding and bonding of roof-top air conditioning and refrigeration equipment?
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A. Yes. Based on a new rule in the 2017 NEC, where equipment is installed using a metal raceway run exposed on a roof for air-conditioning and refrigeration equipment, an equipment grounding conductor of the wire type must be installed within the outdoor portions of metal raceways that use non-threaded fittings [see Sec. 440.9].