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Incident Prevention Magazine

Jim Vaughn, CUSP

Notes From the Underground

In the May/June 2005 issue of Incident Prevention the cover article, "Why Single-Point Grounding Works," generated a lot of inquires about single-point worksite grounding in underground installations. The most frequently asked question was, "How do we create an equipotential zone for underground worksites?" I received inquiries from California to Maine, North Dakota to Florida. There were so many that IP asked if I could immediately address underground protective grounding for employees in this issue.

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Scott Margolin

The Burning Question

Is 100 percent cotton protective in an electric arc flash? While lab tests say so, real life experiences say no!

It is widely understood that clothing made from non-flame resistant synthetic fabrics, such as polyester, nylon and polyester/cotton blends, are not appropriate when working on or near electrically energized parts and equipment. If these garments are exposed to an electric arc flash, they can ignite, melt and drip, which can lead to severe contact burns to the skin. In fact, the OSHA 1910.269 and NFPA 70E standards prohibit this type of clothing.

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