Garments also carry a more precise measure of protection, labeled in calories (CAL)Calories are the units of measure used to describe the force of an arc flashSo a CAL rating of , for instance, means that the garment in question will prevent injury when subjected to an arc flash of calories or less.

ASTM Standard Definitions ATPV (Arc Thermal Performance Value) is the incident energy on a material that results in a probability that sufficient heat transfer through the specimen is predicted to cause the onset of second degree burn injury based on the S Curve, cal cm²Energy Breakopen Threshold (EBT) The incident energy on a material that results in []

Always perform a careful hazard assessmentDetermine the minimum PPE cal cm rating based on the severity of the arc hazardOEL CAL PPE Kits NFPA E Hazard Risk Category (HRC) cal cm Cal Coverall PPE K it contains A rc F lash C overall