The fourth part of getting to know flame resistant clothing : ELECTRICAL HAZARD TERMS
ELECTRICAL HAZARD TERMS
Arc Rating – Value describing a fabric’s performance under exposure to an electrical arc discharge based on testing that determines when the amount of exposure results in a 50-percent probability of causing the onset of second-degree skin burns; expressed in cal/cm² as either an ATPV or an EBT
ATPV – Arc Thermal Performance Value of a fabric shown in cal/cm²
EBT – Energy of Breakopen Threshold; the cal/cm² at which the fabric breaks open before it reaches its ATPV
HRC – Hazard Risk Category; a term used specifically in NFPA 70E; each specific task listed in the 70E table establishes one of five HRC category requirements for the protective clothing and PPE to be worn while performing that task, and each category outlines the minimum arc rating (cal/cm²) for the FR clothing and other PPE required
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