Code Quiz: Essential Electrical Systems

Test your knowledge of the NEC with this challenging question.

April 20, 2022

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Based on the 2020 NEC.

Question: What is the minimum number of transfer switches required in a hospital for a Type 1 Essential Electrical System with a 200kVA load?

See answer below.

Answer: One

Explanation: Section 517.31(B) of the 2020 NEC requires at least one transfer switch for each branch of the Essential Electrical System (Equipment, Life Safety, and Critical Branch).

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.