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Code Quiz: Hubs and Service Masts

July 10, 2014
NEC rules for installing a rigid metal conduit that serves as a service mast.

When installing a rigid metal conduit that serves as a service mast, the hub installed as part of this system shall be __________.

A. approved

B. galvanized

C. listed

D. identified for use with service-entrance equipment

Find the Answer

Answer: D

As noted in Sec. 230.28(A) of the 2014 NEC, “The service mast shall be of adequate strength or be supported by braces or guys to withstand safely the strain imposed by the service-drop or overhead service conductors. Hubs intended for use with a conduit that serves as a service mast shall be identified for use with service-entrance equipment.”

Owen is the owner and president of National Code Seminars and the holder of master electrician certifications in 46 states. He can be reached at [email protected].

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Steven Owen

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