Describe how limited approach, restricted approach, and arc-flash boundaries reduce exposure.
Trace the boundary logic from farthest control to closest exposure. Electrical Boundary Stack Outside barricade Normal travel path No exposure expected Arc-flash boundary Thermal injury zone Arc-rated PPE or stay out Limited approach Shock control for unqualified people Qualified escort or barrier Restricted approach Close shock exposure Qualified worker controls Exposed energized part The source De-energize when feasible Arc-flash boundary is about heat energy.
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