Clothing
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Shall be constructed of arc-rated flame-resistant materials (ASTM F 1506), have electrically non-conductive properties, and have long sleeves and long pant legs.
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Meltable fibers such as acetate, nylon, polyester, polypropylene, and spandex shall not be permitted in fabric underlayers next to the skin (exception: An incidental amount of elastic used on non-melting fabric underwear or socks shall be permitted)