PART IV. GROUNDING (BONDING) OF ENCLOSURE, RACEWAY, AND SERVICE CABLE
250.80 Service Enclosures.
Metal raceways and enclosures containing service conductors must be grounded (bonded) to an effective ground-fault current path [250.4(A)(5)].
Exception: Metal elbows having 18 in. or more of earth cover aren't required to be grounded (bonded) to an effective ground-fault current path. Figure 250.122
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