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I read the Code Question of the Day each morning and seems like I always pick up some good NEC insights. Thanks for what you do. The question is about bonding between a meter enclosure and the service disconnecting means. There is a 3-inch nipple installed and the question is about use of a bonding bushing. Is this required?
Have a great day.
Thanks for the kind words and appreciate you following the Code Question of the Day. Bonding requirements on the supply side of the service disconnect are found in Section 250.92 which includes a few methods to accomplish the bonding between enclosures. Section 250.92 indicates (in part) that electrical continuity at service equipment, service raceways, and service conductor enclosures shall be ensured by one of the following methods: (1) Bonding equipment to the grounded service conductor in a manner provided in 250.8, (2) Connections utilizing threaded couplings or listed threaded hubs on enclosures if made up wrench tight (3) Threadless couplings and connectors if made up tight for metal raceways and metal-clad cables (4) Other listed devices, such as bonding-type locknuts, bushings, or bushings with bonding jumpers. So as you can see, there are a few methods recognized in the NEC as acceptable for meeting this bonding requirement.
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