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NFPA 70E Standard meaning of "working distance"

Question asked by dljohnson on Jul 6, 2016

In the NFPA 70E Standard book, Table 130.7(C)(15)(A)(b) Arc-Flash Hazard PPE Categories for Alternating Current refers to "working distance".  What is meant by "working distance"?  The Table recommends 18 inches of working distance for Arc Flash PPE Category 1 and the other categories recommend up to 36 inches of working distance.  What does "working distance" mean?