So what is arc flash working distance? The working distance is in reference to the arc flash incident energy and it is actually the distance that you are assumed to be standing at while working. If the engineer followed the recommendations in CSAZ462 workplace electrical safety then each label should have listed the following: The CZA Z462 :21 Table 1A is a great resource for both a restricted approach boundary table and a limited approach boundary table. PPE Category 4 currently represents the highest level of compliance, with arc ratings going above 40 cal/cm2.Most industrial facilities have gotten around to completing an arc flash incident energy analysis and posted labels (or stickers) on all of the electrical equipment. PPE Category 4: Minimum Arc Rating 40 cal/cm 2
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