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The only time a bonding bushing/jumper is required for a metal raceway containing feeder/branch circuits is when the raceway contains 277V, 480V, or 480Y/277V circuits AND the raceway encounters oversized, concentric, or eccentric knockouts at an enclosure. See NEC 250.97 #mikeholt #electricaltraining #electrician #electricaleducation #electricaltrade #necrequirements | Mike Holt Enterprises
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