(A) For the purpose of this section, the following definition shall apply unless the context clearly indicates or requires a different meaning.
MAIN BONDING JUMPER. As defined by the National Electric Code, is the connection between the grounded circuit conductor and the equipment grounding conductor at service.
(B) All service equipment must be properly bonded. The purpose of installing bonding bushings and bonding jumpers on service-entrance equipment is to assure a low impedance path to ground should a fault occur on any of the service entrance conductors.
(C) The following National Electric Code regulations are applicable.
(1) NEC § 250-79(a), (b). The main and equipment bonding jumper shall be copper or some other corrosion-resistant metal and attached as per NEC 250-113 and 250-115.
(2) NEC § 250-79(c). The equipment bonding jumper on the supply side of the service and main bonding jumper shall be sized as per Table 250-94, but not less than 12-1/2% of the largest phase conductor.
(Prior Code, § 152.23)