Code Quiz of Day

Edison-base Fuseholder Requirements

Oct. 30, 2014

Part V of Article 240 focuses on the requirements for plug fuses, fuseholders and adapters.

Edison-base fuseholders shall be used only if they are made to accept _____ fuses by the use of adapters.

a) Edison-base
b) medium-base
c) heavy-duty base
d) Type S

See answer and applicable Code reference

The correct answer is: d) Type S

Article 240 provides the general requirements for overcurrent protection and overcurrent protective devices operating at 600V or less. Part V of this Article focuses on plug fuses, fuseholders and adapters. As specifically noted in Sec. 240.52, "Fuseholders of the Edison-base type shall be installed only where they are made to accept Type S fuses by the use of adapters."

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.