A wire-type equipment grounding conductor is now required for some air-conditioning installations. 440.9 Grounding and Bonding. Where metal raceway is 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 using non-threaded fittings (Fig. 15). Analysis: Electrical metallic tubing (EMT) is permitted to be used as an equipment grounding conductor (EGC) ...

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