Code Quiz of Day

Voltage Limitation Between Grouped Receptacles

April 1, 2015

Article 406 covers the rating, type, and installation of receptacles, cord connectors, and attachment plugs (cord caps).

Mike Holt

Receptacles shall not be grouped or ganged in enclosures unless the voltage between adjacent devices does not exceed _____.

a) 100V
b) 200V
c) 300V
d) 400V

See answer and applicable Code reference

The correct answer is: c) 300V

Article 406 covers the rating, type, and installation of receptacles, cord connectors, and attachment plugs (cord caps). Receptacle mounting requirements are outlined in Sec. 406.5. As per 406.5(H), "A receptacle shall not be grouped or ganged in enclosures with other receptacles, snap switches, or similar devices, unless they are arranged so that the voltage between adjacent devices does not exceed 300V, or unless they are installed in enclosures equipped with identified, securely installed barriers between adjacent devices."

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.