Arc Flash Hazard Levels – The Four Primary Categories

- Arc Flash Hazard Levels – The Four Primary Categories

Hi everyone, Jon Travis here from Leaf Electrical Safety, and in this video, I want to teach you all about arc flash hazard levels.

I have been teaching people about the dangers of arc flash for over 10 years, and I have literally helped train thousands of electricians so they can go home safe to their families.

There are 4 primary arc flash hazard levels and they are referred to as the arc flash categories.

Arc flash levels are distinguished by the amount of heat energy that’s produced during a particular arc flash.

This heat energy is called incident energy and is measured in calories per centimeter squared.

Basically, the number will tell how much heat energy you could expect to receive on every square centimeter of your body if you were in an arc flash.

Now, the 4 arc flash hazard levels are listed as 1, 2 ,3 and 4 and they correlate with incident energy levels of 4, 8, 25 and 40 calories per centimeter squared.
Now, no matter how hot the arc flash gets in order to be fully protected you need to wear PPE that covers your entire body and is rated higher than the arc flash level you experience.

So, if you wear in a category 1 arc flash, you’ll need to be covered head to toe in at least 4 calories per centimeter squared PPE.

If you were in a category 4 arc flash you’ll still need full body protection but the rating will have to be greater than 40.

If you are interested in learning more about arc flash hazard levels head over to Leaf Electrical Safety where we go deeper into how all this works.

Thanks for watching!!!

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