Ecmweb 8749 Nec Whats Wrong Here Jan 2017 Pr
Ecmweb 8749 Nec Whats Wrong Here Jan 2017 Pr
Ecmweb 8749 Nec Whats Wrong Here Jan 2017 Pr
Ecmweb 8749 Nec Whats Wrong Here Jan 2017 Pr
Ecmweb 8749 Nec Whats Wrong Here Jan 2017 Pr

What's Wrong Here? Hint: Help support our cause.

Jan. 19, 2017
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. Can you identify the specific Code violation(s) in this photo? Note: Submitted comments must include specific references from the 2017 NEC.

Hint: Help support our cause.

October Winners

Several readers were able to correctly identify the problems with this 480V installation. Our three winners this month were: Gary Johnson, a reader from Tempe, Ariz.; Bryan Schroder, an electrical instructor at Northcentral Technical College in Wausau, Wis.; and Ed Geleski, a project engineer with Dooley Electric Co., Inc. in Brooklyn, N.Y.
According to Sec. 250.97, for circuits exceeding 250V to ground, bonding of the raceways to this enclosure must be in accordance with the requirements for service raceways found in Sec. 250.92(B), except for (B)(1). Section 250.92(B) states that bonding jumpers must be used around oversized concentric or eccentric knockouts and standard locknuts must not be the only bonding means. The raceway entry on the left would be required to have a bonding jumper installed from the raceway to the enclosure in order to bond around the remaining rings. For the top raceway entry, standard locknuts would be permitted since the exception in Sec. 250.97 allows four options if oversized, concentric, or eccentric knockouts are not encountered. The bonding options include:

1) Using threadless connectors for metal-sheathed cables.
2) For RMC or IMC installing one locknut inside and one locknut outside.
3) EMT fittings, FMC fittings, or cable connectors with shoulders that seat firmly against the box, with one locknut inside the cabinet.
4) Other listed fittings.

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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