Equipment labeling is required to be field marked for electrical equipment, such as switchboards, switchgear, panelboards, industrial control panels, meter socket enclosures, and motor control centers, that are in other than dwelling units, and are likely to require examination, adjustment, servicing, or maintenance while energized. Equipment labeling is required to be field marked with a label containing all of the following information:
Watch the accompanying video for more in-depth explanation pertaining to the requirements of an arc flash hazard warning in accordance with 110.16 in the National Electrical Code.
(1) At least one of the following:
- Available incident energy and the corresponding working distance
- Minimum arc rating of clothing
- Required level of PPE
- Highest Hazard/Risk Category (HRC) for the equipment
(2) Nominal system voltage
(3) Arc flash boundary
Exception: Labels applied prior to September 30, 2011, are acceptable if they contain the available incident energy or required level of PPE.
The method of calculating and data to support the information for the label is required to be documented. Watch the accompanying video for more in-depth explanation pertaining to the requirements of an equipment labeling in accordance with NFPA 70E – 130.5(C).