Code Quiz of Day

Space Separation Between Resistors and Reactors

Nov. 3, 2014

Article 470 covers the installation of separate resistors and reactors on electrical circuits.

For installations of resistors and reactors, a thermal barrier shall be required if the space between them and any combustible material is less than _____ .

a) 2 in.
b) 3 in.
c) 6 in.
d) 12 in.

See answer and applicable Code reference

The correct answer is: d) 12 in.

Article 470 covers the installation of separate resistors and reactors on electrical circuits. As noted in Sec. 470.3, "A thermal barrier shall be required if the space between the resistors and reactors and any combustible material is less than 12 in."

About the Author

Mike Holt

Mike Holt is the owner of Mike Holt Enterprises (www.MikeHolt.com), one of the largest electrical publishers in the United States. He earned a master's degree in the Business Administration Program (MBA) from the University of Miami. He earned his reputation as a National Electrical Code (NEC) expert by working his way up through the electrical trade. Formally a construction editor for two different trade publications, Mike started his career as an apprentice electrician and eventually became a master electrician, an electrical inspector, a contractor, and an educator. Mike has taught more than 1,000 classes on 30 different electrical-related subjects — ranging from alarm installations to exam preparation and voltage drop calculations. He continues to produce seminars, videos, books, and online training for the trade as well as contribute monthly Code content to EC&M magazine.