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Code Quiz: Service Entrance Conductor Requirements

Sept. 15, 2022

Test your knowledge of the NEC with this challenging question.

Based on the 2020 NEC.

Question: True or False? Service entrance conductors entering a building are limited to 10 ft in length before connecting to the service disconnect.

See answer below.

Answer: False

Explanation: Section 230.70(A)(1) of the 2020 NEC requires the service disconnect to be located "nearest the point of entrance of the service conductors." No maximum length is specified. Since nearest the point of entry can be subject to the interpretation of the AHJ some jurisdictions will specify the length of conductor permitted and 10 ft is a common interpretation for many AHJs.

Lupacchino is a senior design engineer with Gaylor Electric, Inc. in Noblesville, Ind. and serves as an alternate on NEC Code-Making Panel No. 3. He is currently licensed in more than 80 jurisdictions. He can be reached at [email protected].

About the Author

John Lupacchino | Senior Design Engineer

John began his career in electrical construction as an apprentice and worked his way through the trade. He is currently licensed in more than 80 jurisdictions. With more than 35 years of experience, he now plays a vital role in Gaylor Electric’s Engineering Department, where he serves as a senior design engineer. With a focus on design engineering, quality assurance, and code compliance, he has earned the highest level of respect from industry professionals alike. John currently serves as an alternate on NFPA 70 Code Making Panel No. 3. In addition, he enjoys sharing his electrical knowledge through education. As an Associated Builders and Contractors instructor, he continues to help grow a new generation of high-performing construction leaders.