Approach Boundaries
The risk from exposed live parts depends on your distance from the parts.
The risk from exposed live parts depends on your distance from the parts.
Three "boundaries" are key to protecting yourself from electric shock and one to protect you from arc flashes or blasts. These boundaries are set by the National Fire Protection Association (NFPA 70E-2015).
- The Restricted Approach Boundary: This is the closest boundary to exposed live parts. Only a Qualified Person wearing appropriate PPE, as determined by the Shock Risk Assessment, may enter. The Qualified Person must also have an Energized Electrical Work Permit (EEWP). When you're this close, if you move the wrong way, you and your tools could touch live parts.
- The Limited Approach Boundary: An Unqualified Person may enter this area, but only if continuously supervised and escorted by a Qualified Person, and advised of potential hazards. Both persons must wear appropriate PPE as determined by the Shock Risk Assessment. A qualified person is someone who has demonstrated the skills and knowledge on the hazards and on the construction and operation of equipment involved in a task.
- The Arc Flash Boundary: Only Persons wearing appropriate PPE for the Arc Flash Boundary, as determined by an Arc Flash Risk Assessment, may enter.
Knowledge Check Choose the best answer for the question.
2-3. Only an electrical Qualified Person wearing appropriate PPE, as determined by the Shock Risk Assessment, may enter _____.
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