Code Quiz: Conductor Requirements

April 18, 2024

Test your knowledge of the NEC with this challenging question.

Based on the 2023 NEC.

Question: Conductors installed under or encased in not less than _____ of concrete are considered to be outside of a building.

See answer below.

Answer: 2 in.

Explanation: Section 230.6 gives the conditions where conductors shall be considered outside of a building or other structure. Section 230.6(1) lists "Where installed under not less than 2 in. of concrete beneath a building or other structure" and Sec. 230.6(2) lists "Where installed within a building or other structure in a raceway that is encased in concrete or brick not less than 2 in. thick" as conditions.

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.