Ecmweb 4842 412ecm15pic1
Ecmweb 4842 412ecm15pic1
Ecmweb 4842 412ecm15pic1
Ecmweb 4842 412ecm15pic1
Ecmweb 4842 412ecm15pic1

What's Wrong Here?

Dec. 1, 2004
Hint: This 0.625-inch diameter, 8-foot ground rod electrode is connected to a water pipe clamp.

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

Tony Scaffidi, technical support engineer, Pieper Electric, Milwaukee, submitted this response to the photo in the December issue. “All ground clamps and fittings shall be approved for general use without protection or be protected from physical damage [250.10(1) and (2)]. Where practicable, rods, pipe, or plate electrodes shall be embedded below permanent moisture levels and free of nonconductive coatings [250.53(A)]. The rod shall be driven so that 8 feet is in contact with the earth. Since there's only a couple of inches showing over the concrete, it doesn't look like they had any trouble driving the rod in [250.53(A) and (G)]. It's hard to tell from the picture what type of conductor is used, but 250.64(A) and (B) tells us that a grounding electrode conductor shall be securely fastened to the surface on which it is carried. A 4 AWG conductor, or larger, is required to be protected from physical damage if exposed.”

In addition to citing the same violations as Scaffidi, Marc Blaine, electrician, Colgate Palmolive Co., Morristown, N. J., noted: “Grounding conductors and bonding jumpers shall be connected by listed clamps or other listed means. The clamp used in this instance is a water pipe clamp, not a recognized ground rod clamp [250.8].” He added, “250.70 covers pretty much the same subject indicated in 250.8, but also notes ‘Ground clamps …, where used on pipe, rod, or other buried electrodes, shall also be listed for direct soil burial or concrete encasement.’ The plated steel screws used to make the conductor connection and maintain the grip of the two clamp halves on the electrode often rust through over time, creating a poor (high resistance) connection. A ground rod clamp (acorn) is made of non-corroding material, which is why it gets the UL Listing for this application and the water pipe clamp doesn't.”

Bob O'Brien, project manager, Riggs Distler & Co., Inc., Sharon Hill, Pa., also identified a combination of violations noted by the two other December winners.

About the Author

Joe Tedesco

Tedesco served the industry in many roles during his career. He was a director, senior electrical code instructor for National Technology Transfer, Inc. and American Trainco, Inc.. He was also a codes, standards and seminar specialist for the International Association of Electrical Inspectors and an electrical field service specialist for the National Fire Protection Association in Quincy, Mass. He ran his own business as an NEC consultant and is a Massachusetts licensed master electrician and journeyman electrician and certified electrical inspector (one and two family 2A; General 2B, and Plan Review, 2C). Tedesco also wrote articles for CEE News and EC&M (Code Violations Illustrated and What's Wrong Here?) for more than 15 years and helped launched the Moving Violations video series.

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