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What’s Wrong Here? Hint: Look Out Below!

Oct. 5, 2017
Think you know how this installation violates the NEC?

Hint: Look out below!

Scroll Down to See the Answer

These unsuspecting pedestrians have no idea they’re walking over some temporary feeder cables installed to provide power for the street fair.  For the most part, these cables are protected by the mats that have been placed over them, which helps minimize tripping hazards and provide some degree of separation from unqualified people. Unfortunately, the installers did not stagger the matt connectors. The result is the exposure of unguarded cables. This is a violation of Sec. 525.20(E). Laying these single conductor cables on the ground may seem like a violation of Sec. 590.4(J), which prohibits temporary feeder cables or cords from being installed in this manner. However, because this wiring is for a fair, Sec. 525.3(A) clarifies that where the Code rules for other Articles differ from the rules in Art. 525, the requirements found in Art. 525 shall apply to portable wiring. For the most part, these accessible cables comply with Sec. 525.20(G) since the protective matting does not constitute a greater tripping hazard than the cables themselves. The exposed connectors do need to be addressed though.

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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