NFPA 70E Article 100 Definitions.

The arc rating is expressed in cal/cm2.
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The arc rating is expressed in cal/cm2.

The following definitions can be found in Article 100 of NFPA 70E:

Below is a sample of NFPA 70E. For the complete section, see the actual NFPA 70E text at NFPA.ORG. Once there, click on the free access link to NFPA 70E.

Arc Flash Hazard. A source of possible injury or damage to health associated with the release of energy caused by an electric arc.

Arc Flash Suit. A complete arc-rated clothing and equipment system that covers the entire body, except for the hands and feet.

Arc Rating. The value attributed to materials that describes their performance to exposure to an electrical arc discharge. The arc rating is expressed in cal/cm2 and is derived from the determined value of the arc thermal performance value (ATPV) or energy of breakopen threshold (EBT) (should a material system exhibit a breakopen response below the ATPV value). Arc rating is reported as either ATPV or EBT, whichever is the lower value.

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NFPA 70E Article 100 Definitions.

Below is a Real Question from our Electrical Continuing Education Courses for Electrical License Renewal:

Refer to the definitions and the image.

Which of the following is true?

A: The clothing in the image is an arc flash suit.
B: The clothing in the image is an arc flash hazard.
C: The arc rating of the clothing is 40 cal/cm2.
D: The rating on the clothing is for 40kA of available fault current.
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