Electrical equipment in locations other than dwelling units that may require examination, adjustment, servicing, or maintenance while energized must be labeled with both the available incident energy and the minimum arc rating of clothing.

Electrical equipment in locations other than dwelling units that may require examination, adjustment, servicing, or maintenance while energized must be labeled with both the available incident energy and the minimum arc rating of clothing.

• A. True
• B. False
• C. Only incident energy
• D. Only arc rating

Answer: (B)

The key idea is arc flash labeling for equipment that might be worked on while energized. In locations other than dwelling units, if work could occur with the power on, the equipment must be labeled with the available incident energy and the corresponding PPE category (or the PPE requirements that go with that energy). The PPE category tells you what arc-rated clothing is needed, but you don’t label the equipment with a separate “minimum arc rating of clothing.” The label communicates the energy level and the required PPE category, and the wearer’s clothing rating is determined from that information. So stating that both the incident energy and the minimum arc rating of clothing must be labeled is not how the requirement is written.

The key idea is arc flash labeling for equipment that might be worked on while energized. In locations other than dwelling units, if work could occur with the power on, the equipment must be labeled with the available incident energy and the corresponding PPE category (or the PPE requirements that go with that energy). The PPE category tells you what arc-rated clothing is needed, but you don’t label the equipment with a separate “minimum arc rating of clothing.” The label communicates the energy level and the required PPE category, and the wearer’s clothing rating is determined from that information. So stating that both the incident energy and the minimum arc rating of clothing must be labeled is not how the requirement is written.