What is Arc Flash?
An arc flash is a dangerous electrical explosion that can happen when there's a fault in an electrical system. Choosing the right personal protective equipment (PPE) for arc flashes is crucial but can be complicated. Unlike regular electrical gear that's chosen based on voltage, arc flash PPE depends on complex calculations to determine the level of protection needed. These calculations are usually done by electrical engineers and can be costly and time-consuming.
Here are some key terms to understand:
Flame Resistant (Flame Retardant): This means the material can resist catching fire or burning.
Arc Rating (Arc Rated): This indicates the level of protection a material provides against the intense heat and energy of an arc flash. It's measured in cal/cm² (calories per square centimeter).
Difference Between Flame Resistant and Arc Rated: All arc-rated garments are flame resistant, but not all flame-resistant garments are arc rated. Flame resistance generally means protection against heat and fire, while arc rating specifically tests protection against electrical arc flashes.
Inherent Flame Resistance vs. Treatments: Inherently flame-resistant materials have built-in protection that won't wash out, whereas treated materials have been treated with chemicals to achieve flame resistance, which may diminish over time with washing.
Choosing the right arc flash PPE involves understanding these terms and ensuring the gear meets the specific arc rating required for the job's electrical hazards.