What's Wrong Here Oct 4 2018

What’s Wrong Here? Hint: Poor Choice for Pole Wiring

Oct. 4, 2018
Think you know how this installation violates the NEC?

Hint: Poor choice for pole wiring

Scroll down for the answer

The cables on this pole are Type NM cables. I was able to get right up close to the cables to confirm it. They are not UF cables.

Per Sec. 334.12(B)(4), NM cables are not permitted to be installed in any wet or damp locations such as on this outdoor pole. In addition, Sec. 300.6(C)(1) requires nonmetallic raceways, cables, boxes, cabinets and other nonmetallic equipment to be made of material listed as being sunlight resistant or identified as being sunlight resistant. The jacket on these NM cables is neither listed nor identified as being sunlight resistant. With prolonged exposure to sun, rain, snow, and extreme temperatures, the jacket on these cables will fail. It will become brittle and cracked and will soon let moisture and water in, causing the insulation on the conductors to fail too. This will become a very serious problem when that happens.

Section 340.10(3) points out that UF cables would be allowed to be used in this wet location. Section 340.12(9) allows UF cables that are identified as being sunlight resistant to be used in this location exposed to direct sunlight. For some reason, this installer chose to use NM cables rather than a more appropriate wiring method such as UF or SE cables, which are also suitable for outdoor use.

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.

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