PPE

Why can’t daily work clothes meet the needs of arc protection

1n the electric power industry, the daily clothing, such as cotton and swimming cotton blends, can not protect ordinary people from the threat of electric arc. On the contrary, they increase the damage

protective clothing made of blended fabric of common materials will melt and / or burn when exposed to the heat generated by arc explosion. These fabrics may still burn even after the arc accident, which is more serious than the damage caused by the arc itself. The greater the weight and thickness of the fabric, the more fuel it provides. The arc accident may end in an instant, but the general clothing may continue to burn, and it only takes a few seconds to cause third degree burns. Clothing made from these fabrics will melt and adhere to the skin, which must be erased or surgically removed. Wearing combustible clothing and exposure to arc explosion may increase the degree of burn. Survival from burns depends on many factors, including the age of the survivor and the total burn area. 1n all age groups, the larger the total burn area, the lower the survival chance

in addition, everyday clothes are not designed for bursting. The explosive power of the arc is enough to tear daily clothes, such as cotton and polyester cotton blended clothes, so that the employees’ bodies are directly exposed to the arc

the degree of burn caused by arc accident varies with the duration, current and arc length. At the same time, the degree of burn also varies with the distance between the worker and the arc, the type and weight of clothing fabric and the number of layers of clothing< According to OSHA 29 CFR 1910.269, employers must ensure that the clothing provided to employees exposed to fire or arc hazards meet the requirements of power generation, transmission and distribution regulations NFPA 70E is a standard of National Fire Protection Association of America, which basically covers all aspects of electrical safety in all industries and workshops. NFPA 70E recommends the use of personal protective devices for arc and flame protection in accordance with ASTM f1506, ASTM f1891 and ASTM f2178 ASTM f1506 specifies the performance specifications for flame retardant fabric materials used by electrical operators exposed to transient arc and related thermal hazards. ASTM f1506 standard specifies specific indexes related to protection, including vertical combustion performance test and arc protection grade test. There are no regulations on explosion pressure, molten metal flyover and / or gas emissions NFPA has developed many side test methods and performance standards to test and assess the materials of flame retardant protective clothing and personal protective equipment. These devices are used to reduce the risk of burns to people who may be exposed to arc hazards. Test methods and standards include ASTM f1959, ASTM f1506 and NFPA 70E in Appendix 2 of the regulations on the management of all tools and instruments of the State Grid Corporation of China (SGCC) on trial implementation in 2005, arc protective clothing has been clearly listed as general protective safety tools and instruments, and the requirements for the general protective safety tools and instruments of substations and teams are put forward in Appendix 7 and 8 respectively this article is reprinted by 1nternet media, which only represents the author’s point of view and has nothing to do with China labor insurance network. 1f the information column articles and comments violate your legal rights, please call to let us know and we will deal with them in time

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