What to Know About Arc Flash Safety PPE While Working with ARC Flash Hazards Gloves All electrical gloves must be re-certified six months after date of use per OSHA 29 CFR 1910.137(c)(2)(viii). Unopened re-certified gloves have a one-year shelf life from last certification. A leather protective glove should always be used with rubber insulated gloves as a protective barrier. • Class 00 – 500 volts maximum • Class 0 – 1,000 volts maximum • Class 1 – 7,500 volts maximum • Class 2 – 17,000 volts maximum • Class 3 – 26,500 volts maximum • Class 4 – 36,000 volts maximum Clothing Clothing levels are determined by an HRC (Hazard Risk Category) level and are measured in the amount of calories per square centimeter (ATPV or cal/cm2). The higher the ATPV, the higher the HRC level attained, the greater the protection. Hazard Risk Category Common FR Clothing at This Level Minimum ATPV (Cal/cm^2) HRC 1 FR shirt and FR pants; or FR coveralls; Single base layer of FR protection 4 HRC 2 FR under garments (undershirt, underwear), FR shirt, and FR pants; 8 FR under garments, FR coveralls; 2 or more layers of FR protection HRC 3 FR under garments (undershirt, underwear), FR shirt, FR jacket, 25 FR pants, and FR coveralls; 2-3 or more layers of FR protection; HRC 4 FR under garments (undershirt, underwear), FR shirt, FR jacket/coat, 40 FR pants, and FR coveralls; FR under garments (undershirt, underwear), FR shirt, FR pants, multilayer flash suit; 3-4 or more layers of FR protection NOTE: Layering generally gives more protection than the sum total of the ATPV values of the individual garments being layered. However, this needs to be tested for each specific garment being layered and thus is never explicitly included in layered calculations, but rest assured, layering FR clothing grants you at least some extra protection. SAFETY FOR TECHNICAL SUPPORT CONTACT: SAFETYQUESTIONS@FASTENAL.COM OR 1-833-FNL-SAFE
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