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Ecmweb Com Sites Ecmweb com Files Uploads 2013 01 010313 Ww Hweb
Ecmweb Com Sites Ecmweb com Files Uploads 2013 01 010313 Ww Hweb

What’s Wrong Here? Hint: A Bundle of Joy

Jan. 3, 2013
Can you identify the Code violation(s) in this photo?

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: A bundle of joy

Find the Answer

While this bundle itself is not a violation, the NM cable used to support the whole bundle is most certainly a Code violation. Section 300.11(C) prohibits cable wiring methods from being used "as a means of support for other cables, raceways, or nonelectrical equipment."

In this installation, there are only a couple of NM cables stapled to the side of the joist, and all of the other NM cables are bundled and secured to those original cables. This could cause damage to the stapled cables, since it adds significant weight onto the cable jacket, insulation, and conductors of the original cables. This can be a common problem where installers simply run out of room to staple any more cables onto the beam. Instead of installing running boards or using a different joist, installers will mistakenly tie-wrap cable after cable onto those that were originally stapled to the beam.

Although bundling of NM cables is not a violation of the Code, installers must also be aware of the requirements to adjust the ampacity of the conductors in accordance with 310.15(B)(3). Where single or multi-conductor cables are installed similar to this installation, "longer than 24 in. without maintaining spacing," the allowable ampacity of each conductor shall be reduced in accordance with table 310.15(B)(3)(a).

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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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