Code Quiz of Day

Sealing and Drainage Requirements for Type MI Cable

Dec. 1, 2014

Part II of Article 501 outlines the requirements for wiring systems installed in Class I, Division 1 and 2 locations.

Sealing compound shall be used in Type MI cable termination fittings to _____.

a) prevent the passage of gas or vapor
b) exclude moisture and other fluids from the cable insulation
c) limit a possible explosion
d) prevent the escape of powder

See answer and applicable Code reference

The correct answer is: b) exclude moisture and other fluids from the cable insulation

Article 501 covers the requirements for electrical and electronic equipment and wiring for all voltages in Class I, Division 1 and 2 locations. Part II of this Article outlines the requirements for wiring. As specifically noted in Sec. 501.15, "Seals in conduit and cable systems shall comply with 501.15(A) through (F). Sealing compound shall be used in Type MI cable termination fittings to exclude moisture and other fluids from the cable insulation."

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.