Which item is NOT required on an arc flash label?

• A. The incident energy or PPE category required.
• B. The date.
• C. The equipment’s serial number.
• D. The location and scope of hazard.

Answer: (C)

Arc flash labels are meant to clearly communicate the hazard so workers know what PPE to wear and how close they can approach. The essential information on the label includes the incident energy value (or PPE category) and the specific location or scope of the hazard, along with the date to show when the label was issued or updated. The equipment’s serial number doesn’t affect the hazard level or the PPE requirements, so it isn’t needed on the label. Serial numbers are mainly for asset tracking and maintenance records, not for guiding safe work practices around arc flash. Therefore, the item not required on an arc flash label is the equipment’s serial number.