Electrical Nonmetallic Tubing

What’s Wrong Here? Hint: Exterior ENT Fail

May 11, 2023
Think you know how this installation violates the NEC?

Hint: Exterior ENT fail

Electrical Nonmetallic Tubing (ENT) cannot be installed in locations exposed to the direct rays of the sun. Section 362.12(7) prohibits this type of exterior installation unless the ENT is identified as being sunlight resistant. The lack of any securing and supporting for this ENT is a violation of Sec. 362.30. ENT must be securely fastened at intervals not exceeding 3 ft, and within 3 ft of each box, cabinet, fitting, or other raceway termination in accordance with Sec. 362.30(A). This raceway is simply flopping all over the side of this building with absolutely zero supports or securement. Using ENT with PVC conduit fittings may not be a violation if the correct fittings and solvent glue are used. Section 362.48 permits these joints between raceway and fittings to made be in an approved manner. 

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.

Voice your opinion!

To join the conversation, and become an exclusive member of EC&M, create an account today!

Sponsored Recommendations

Chapter 9 of the NEC — Part 5

Calculating voltage drop with help from Table 8.

How to Calculate Labor Costs

Most important to accurately estimating labor costs is knowing the approximate hours required for project completion. Learn how to calculate electrical labor cost.

8 Types of Electrical Conduit and Their Uses

Electrical conduit is a tube or raceway used to house and protect electrical wires within a building or structure. From data centers to underground subways to ports and bridges...

Champion Strut Catalog

Champion Fiberglass is the most advanced manufacturing facility of fiberglass conduit, fiberglass bridge drain and fiberglass strut systems in the world. Its well-trained and ...