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What's Wrong Here?

What's Wrong Here?

A pavement contractor installed this Schedule 40 RNMC beneath a city street. It was joined together with a larger size sleeve of the same material.


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. Joe Tedesco, who has a knack for finding shoddy electrical work, did the dirty work and found this mess. Now it's your turn to identify the violation.

Find the Answer

The following individuals correctly identified the Code violations shown in the October column: Cindy Stellmack, facilities electrical engineer, Lockheed Martin, Owego, N.Y.; Paul Bazil, P.E., electrical engineer, U.S. Coast Guard, Civil Engineering Unit, Cleveland; and Michael Doberdruk, P.E., senior electrical engineer, Richard L. Bowen & Associates, Architects & Engineers, Cleveland.

Each winner noted the following violations. The cover used in this street installation is inadequate. For conductors energized to 600V, NEC Table 300.5 requires a minimum cover of 24 in. Those energized at more than 600V require a cover of 30 in. (300.50). In addition, the backfill in the trench is unsuitable for this installation [300.5(F)]. RNMC and associated fittings must be listed and installed in accordance with 352.48 and 352.6.

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