What are the three protection boundaries?

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Multiple Choice

What are the three protection boundaries?

Explanation:
The concept being tested is the safety zones used around exposed live electrical parts to protect workers from arc flash and shock hazards. The three protection boundaries are arc flash boundary, limited approach boundary, and restricted approach boundary. Arc flash boundary is the outermost limit—the distance from live parts where the incident energy of an arc flash reaches a level (1.2 cal/cm^2) that can cause a second‑degree burn. This boundary helps determine the PPE and procedures needed for work near the equipment. Inside that, the limited approach boundary defines a closer zone that only qualified persons with the proper PPE and work procedures can enter. It marks where the shock hazard becomes more significant and requires tighter controls. Even closer is the restricted approach boundary, the innermost zone. Only qualified personnel using approved methods and protection may approach these live parts. Other options don’t describe these defined zones: grounding and bonding relate to fault paths, and the other terms are not the standard terms used for these safety boundaries.

The concept being tested is the safety zones used around exposed live electrical parts to protect workers from arc flash and shock hazards. The three protection boundaries are arc flash boundary, limited approach boundary, and restricted approach boundary.

Arc flash boundary is the outermost limit—the distance from live parts where the incident energy of an arc flash reaches a level (1.2 cal/cm^2) that can cause a second‑degree burn. This boundary helps determine the PPE and procedures needed for work near the equipment.

Inside that, the limited approach boundary defines a closer zone that only qualified persons with the proper PPE and work procedures can enter. It marks where the shock hazard becomes more significant and requires tighter controls.

Even closer is the restricted approach boundary, the innermost zone. Only qualified personnel using approved methods and protection may approach these live parts.

Other options don’t describe these defined zones: grounding and bonding relate to fault paths, and the other terms are not the standard terms used for these safety boundaries.

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