According to NFPA 70E, what criteria should be included in developing arc-flash labels?

The correct answer emphasizes the importance of providing essential safety information on arc-flash labels. According to NFPA 70E, such labels should include the nominal system voltage and incident energy levels, as these details directly impact the safety of workers who may be exposed to potential arc-flash hazards.

The nominal system voltage informs personnel about the electrical potential they are dealing with, while the incident energy levels indicate the amount of thermal energy generated during an arc flash, measured in calories per square centimeter. This information helps in determining the appropriate personal protective equipment (PPE) and safe working practices required when working near live electrical equipment.

In contrast, including energy efficiency ratings, manufacturer warranty information, or the cost of equipment is not relevant for ensuring safety in the context of arc-flash hazards. These aspects do not provide the critical data necessary for assessing the risk associated with electrical work and do not aid in protecting workers from potential injuries due to arc flashes.