![]() The onset of second-degree burns may occur at 1.2 calories per centimeter squared per second. See ATPV.Ĭalorie: A calorie is the energy required to raise one gram of water one degree Celsius at one atmosphere. Once this value is known, the ATPV rating of the flash clothing required for work at that distance from the potential flash hazard is also known. The calories per square centimeter rating of most arc flash protection suits, coveralls, and coats is commonly sewn into the fabric in large letters on the outside of the garment.Ĭalories per Centimeter Squared (cal/cm2): This is a number identifying the amount of energy that can be delivered to a point at a particular distance from an arc flash. ![]() This rating also applies to fabrics, however, a garment made from more than one layer of arc flash rated fabric will have a calorie per square centimeter rating greater than the sum of the ATPV ratings of the original fabrics. An arcing fault can release tremendous amounts of concentrated radiant energy at the point of the arcing in a small fraction of a second resulting in extremely high temperatures, a tremendous pressure blast, and shrapnel hurling at high velocity.ĪSTM: American Society for Testing and MaterialsĪrc Thermal Performance Value (ATPV): This value is presented in calories per square centimeter and represents the maximum capability for arc flash protection of a particular garment. Arc Flash: An arcing fault is the flow of current through the air between phase conductors or phase conductors and neutral or ground.
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