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Tuesday, October 20, 2020

Question:

Hello CQD,

Are the 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.

Hugh Jones

A

Answer:

Hi Hugh, and thanks for the question. Fairly straight forward, and it seems you have answered your 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 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 use when no other method of bonding is installed. Since bonding bushings are installed, the use of standard locknuts is acceptable. See NEC Sections 250.92(A), 250.92(B)
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