NFPA 70E PPE Categories 0-4, Decoded
Five categories, one incident-energy number deciding which one applies, and a hard ceiling above 40 cal/cm² where the tables simply stop answering the question.
Read more →Four Boundaries, One Panel: Making Sense of NFPA 70E's Approach Distances
Limited, Restricted, Arc Flash Protection, and the equipment itself - four zones around every energized panel, each with a different rule for who can be there and what they need to be wearing.
Read more →What Actually Happens Inside an Arc Flash
An arc flash isn't a fire and it isn't a shock. It's a plasma explosion that can hit four times the surface temperature of the sun in microseconds - and the number that decides how bad it is has nothing to do with voltage alone.
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