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Why FR Clothing Is Not One-Size-Fits-All Flame resistant (FR) clothing is required wherever workers face exposure to flash fire, arc flash, or electric arc hazards. But beyond that broad mandate, the specific garments, arc ratings, and fabric weights your crew needs depend almost entirely on your industry, your job tasks, and the hazards unique to your work environment. A utility lineman working on energized transmission lines faces different thermal hazards than a pipeline welder or a highway c …