grounding bushing
Grounding Accessories and the NEC: Bushings, Pigtails, Bonding Jumpers, and Rebar Clamps
Insulated grounding bushings, pigtails and grounding screws, water heater bonding kits, braided jumpers, and rebar clamps — what each one does and the NEC section (250.97, 250.146, 250.148, 250.8, 250.104, 250.98, 250.52) that requires it.
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