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What’s Wrong Here? Hint: Squeeze Play

May 18, 2017
Think you know how this installation violates the NEC?

How well do you know the Code? Think you can spot violations the original installer either ignored or couldn't identify? Here's your chance to moonlight as an electrical inspector and second-guess someone else's work from the safety of your living room or office. It's your turn to identify the violation.

Hint: Squeeze play

Find the Answer

At one point in time, this UF cable was buried. Unfortunately, a seed landed at the concrete base of this light pole and over time it grew into a tree, which eventually swallowed the cable and pulled it right out of the ground. Since that time, this cable has gotten stepped on and damaged to the point where it shorted out and tripped the breaker. Thankfully, the breaker did its job. Otherwise this damaged cable would have continued to present a real shock hazard.

Column 1 of Table 300.5 in the 2017 NEC requires UF cable to be buried with at least 24 in. of cover for this location. Sec. 340.12(10) prohibits this UF cable from being used in areas where subject to physical damage. It’s obvious from the photo that this cable has suffered some severe physical damage. I was able to cut the cable away from this tree base and use some listed underground splice kits — in accordance with Sec. 110.14(B) — to extend and re-route this cable away from this pole to a safe and properly buried location.

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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