What's Wrong Here?

What’s Wrong Here? Hint: This Cable Needs Some Sunblock

Nov. 1, 2017

Think you know how this installation violates the NEC?

Hint: This cable needs some sunblock

Scroll Down to See the Answer

I spotted this NEC violation while vacationing in Arizona. That’s a nonmetallic cable coming out of the wall and running up the side of the building.

Using NM cable outdoors in this wet location is a violation of Sec. 334.12(B)(4). In addition, NM cable isn’t sunlight resistant as required in Sec. 300.6(C)(1). Section 334.116(A) tells us that the outer covering is flame retardant and moisture resistant, but says nothing about it being sunlight resistant. The hot Arizona sun will eventually cause the jacket to become brittle and dried out, destroying it in the process.

The NM cable connector sticking out the side of the building is a violation of Sec. 110.3(B) since it is made for use in dry locations only. The support requirements of Sec. 334.30 state the NM cable must be secured within 12 in. of every cable entry into cabinets, boxes or fittings. This cable is stapled about 3 ft away from the connector. Spacing the staples too far apart can allow the cable to be more easily damaged due to drooping or sagging in the cable.

While there are many problems with this installation, at least the installer was thoughtful enough to install a “drip loop” on the NM where it enters the building.

About the Author

Russ LeBlanc | Owner

Russ started in the electrical trade as an apprentice in 1985. He worked his way up to become a Journeyman Electrician and then eventually became a Master Electrician and Licensed Construction Supervisor. In 1999 Russ become an Electrical Instructor for The Peterson School of Engineering in Massachusetts where he developed his passion for teaching, and quickly became Department Head of Electrical Instruction. Russ has taught thousands of apprentices, electricians, engineers, inspectors, and other electrical professionals during his career as an instructor. He continues to provide electrical professionals with Electrical Code seminars, Arc-Flash Awareness training seminars and educational material through his LeBlanc Consulting Services in North Reading, MA whose specialty is educating electricians. He has been an active member of the NFPA Electrical Section and has authored hundreds of National Electrical Code proposals and comments which have become Code rules to improve the safety for the electrical industry. Russ is also an IAEI certified Electrical Inspector.

Please visit www.russleblanc.net for more information.