In arc flash safety planning, what terms describe energy exposure boundaries?

• A. Ground boundaries
• B. Insulation boundaries
• C. Approach boundaries: Limited, Restricted, Restricted Energized
• D. Voltage boundaries

Answer: (C)

In arc flash safety planning, how close a person can get to live electrical parts is controlled by energy exposure boundaries known as approach boundaries. These define progressively closer distances to energized parts and map to different PPE and procedures. The three approach boundaries are the Limited Approach Boundary, the Restricted Approach Boundary, and the Restricted Energized Boundary. The outer boundary sets where the hazard exists and where only qualified personnel with appropriate PPE should go. The next, closer boundary requires more stringent PPE and procedures. The innermost boundary applies when parts remain energized and only highly trained, authorized people with specific protections may work there, or the work must be performed with the equipment de-energized. Understanding these boundaries helps determine PPE requirements and whether a task can be performed energized or must be de-energized.