Field-by-field guide to NFPA 70E §130.5(H) arc flash label requirements — the required and optional fields, when labels are mandatory, how often they must be updated, ANSI Z535.4 signal-word selection, and how the requirement interacts with NEC 110.16.
Switchboards, panelboards, industrial control panels, meter socket enclosures, and motor control centers operating at 50 V or more that are likely to be examined, adjusted, serviced, or maintained while energized.
Nominal system voltage, arc flash boundary, and either incident energy with working distance OR PPE category from Table 130.7(C)(15).
Labels must be reviewed and updated at least every five years and any time a modification affects the arc flash hazard.
WARNING orange for ≤ 40 cal/cm² and ≤ 600 V. DANGER red above either threshold.
NEC 110.16 requires a generic field-applied arc flash warning marking. NFPA 70E §130.5(H) requires the detailed hazard label with study data.