Ecmweb 4050 509qa08jpg
Ecmweb 4050 509qa08jpg
Ecmweb 4050 509qa08jpg
Ecmweb 4050 509qa08jpg
Ecmweb 4050 509qa08jpg

Code Q&A

Sept. 8, 2005
Q. I’m working on an electric gate installation. Can I install control wiring in the same raceway with electrical power conductors? A. Maybe. According to 725.26(B)(1), Class 1 circuits can be placed in the same cable, enclosure, or raceway with ...

















Q. I’m working on an electric gate installation. Can I install control wiring in the same raceway with electrical power conductors?

A. Maybe. According to 725.26(B)(1), Class 1 circuits can be placed in the same cable, enclosure, or raceway with power-supply circuits, if the equipment powered is functionally associated with the Class 1 circuit (Figure 725-26B1 UN725-25). However, 725.55(A) states that Class 2 and Class 3 circuit conductors must not be placed in any enclosure, raceway, or cable with conductors of electric light and power. How do you know if you have a Class 1 or Class 2 circuit? Check with the manufacture and find out if the control circuit power supply is intended for Class 2 or Class 3 wiring.

Keep in mind that Exception 2 of 725.52(A) allows you to reclassify a Class 2 or Class 3 circuit into a Class 1 circuit if the Class 2 or Class 3 equipment markings required by 725.42 are eliminated and the entire circuit is installed in a Chapter 3 wiring method [725.55(D)(2)(b)] and 600V conductors are used. Note that Class 2 and Class 3 circuits reclassified and installed as Class 1 circuits are no longer Class 2 or Class 3, regardless of the continued connection to a Class 2 or Class 3 power source.

Got a question for Mike? E-mail him at [email protected].

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.

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