Arc-rated clothing must be tested for exposure to what?

Arc-rated clothing must be tested specifically for exposure to electric arcs. This testing determines the fabric's ability to withstand the intense temperatures and electrical energy produced when an arc occurs. An electric arc can generate extreme heat, which can cause severe burns to any skin that is unprotected. Therefore, arc-rated clothing is designed to prevent or reduce the severity of such injuries by providing a protective barrier.

The materials used in arc-rated clothing undergo rigorous testing processes to ascertain their arc protection performance, indicated by an Arc Thermal Performance Value (ATPV). This value signifies the amount of thermal energy in calories per square centimeter that the material can withstand before failing. This focus on electric arcs distinguishes arc-rated clothing from other types of personal protective equipment, which may be tested for different hazards like flame resistance or general heat sources but do not provide the specific protection needed against electrical arcs.