What should a permanent arc-flash label indicate when applied to service equipment rated 1000 amps or more?

When applied to service equipment rated 1000 amps or more, a permanent arc-flash label should indicate potential electric arc-flash hazards. This is crucial because arc-flash events can be extremely dangerous and may result in serious injury or even death to personnel working on or near energized electrical equipment.

The label serves to inform workers about the hazards associated with the equipment, including the risk of an arc-flash incident, the energy levels involved, and necessary precautions that should be taken to ensure safety. This aligns with safety protocols established in the NEC, which prioritize the protection of personnel working with or near high-capacity electrical systems.

Other options, such as environmental hazards, energy efficiency ratings, and installation instructions do not directly address the need for safety information essential for preventing injuries from arc-flash incidents. While these elements are also important in the broader context of electrical safety and equipment operation, they do not provide the targeted information about arc-flash risks that a proper permanent label requires.