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Tuesday, April 5, 2022
Question:
Greetings CQD,
Are standard rigid locknuts suitable for bonding when used with a conduit nipple installed between a meter socket and the service disconnecting means enclosure? There are bonding bushings installed on both ends of the nipple with a bonding jumper connected to each enclosure.
A
Answer:
Hi Martin,
Thanks for participating. This is fairly straightforward, and it seems you have answered your own question. First, standard locknuts as a general rule are not a suitable method of bonding in the line side of the service disconnect. Second, based on the information provided in the question, it sounds like bonding bushings are installed on each end of the conduit between enclosures which would negate the need for bonding locknuts. Bonding locknuts are one method for bonding on the supply side of the service and they must be used, when no other method of bonding is installed. Since bonding bushings are installed, the use of standard locknuts is acceptable. See Sections 250.92(A) and 250.92(B).