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European and American standards for arc thermal protection

European and American standards for arc thermal protection

Aug 25, 2018



     Arc flash fire is the most likely cause of electrical workers' electric shock accidents, because the temperature of the severe arc is about 35,000 degrees Fahrenheit is 4 times the surface temperature of the sun, and the surrounding material is vaporized or burned at high temperature. If the worker's clothes are ignited, it will cause a large burn of the body.


      At present, the testing standards for arc protective clothing mainly include European standards and American standards.


EN61482

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      The European standard for arc protective clothing fabric testing standards is based on the exposure of four fabrics under the arc reaction to detect the corresponding data results of the fabric. The test conditions are test voltage 400V, arc flash time 500ms, upper electrode made of aluminum, lower electrode made of copper, electrode space 30mm, test sample and electrode space distance 300mm.

 

     The European standard requires that the design of the garment does not cause any movement obstacles to the user during use and work; the garment must be designed with long sleeves to protect the entire upper torso; the button or zipper fitting of the garment reacts in the arc flashover It can still operate normally; the sewing thread, accessories, buttons or zipper accessories of the garment will not cause further human injury after the arc flash reaction; the metal fittings, buttons or zippers must be covered by the fabric, non-metallic fittings, buttons or zippers can be used. Exposure to the surface.


NFPA 70E

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      The American standard for arc protective clothing is mainly determined from the aspects of flame retardancy, fabric weight, tensile strength, tear strength, color fastness to washing, water shrinkage and arc protection. Its arc protection is worthy of measurement for 21 fabrics exposed to an arc reaction.

 

     US standard requirements for clothing: clothing sewing threads, accessories, buttons or zipper accessories will not cause further human injury after the arc flash reaction; the flame retardant sewing thread should be used on the clothing and face the 191A flame retardant test 260 °C does not melt at the test temperature; if any clothing accessories, zipper or button may cause heat transfer or melting in the arc flash reaction, it must be covered with fabric to avoid direct contact with the skin.


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