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PS: There are changes to the definition of arc flash boundary in the upcoming NFPA 70E Standard for Electrical Safety in the Workplace. Specifically, the revised definition of arc flash boundary no longer uses the term "second degree burn" but instead "at which incident energy equals 1.2 cal/cm2.", and the revised informational note references the Stoll skin burn injury model.

Hazard Risk Category will now be referred to as PPE Category. Hazard Risk Category 0 was deleted because the new PPE Table only specifies PPE for work within the arc flash boundary. If there is no arc flash hazard, then no arc flash PPE is required an it is therefore not necessary on a table devoted to PPE."

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(1) Nominal system voltage (2) Arc flash boundary (3) At least one of the following: • Available incident energy and the corresponding working distance, or the arc flash PPE category in Table 130.7(C)(15)(A)(b) or Table 130.7(C)(15)(B) for the equipment, but not both • Minimum arc rating of clothing • Site-specific level of PPE