Free Arc Flash Label Template: 3 Standard Sizes, ANSI Z535.4 Layout

An arc flash label template is the fixed layout your panel data drops into: the signal-word header, the hazard symbol, and the data fields NEC 2026 §110.16 and NFPA 70E §130.5(H) require. This page shows the layout, the sizes that actually get specified, and the free way to fill one in — our calculator doubles as a browser label maker, so you are not downloading a blank form and typing numbers into it by hand.

Last reviewed: July 18, 2026.

The three standard label sizes

Public project specifications are consistent about physical sizes:

A fourth size, 6×8 in, appears for large switchgear lineups where the label must be readable from a distance. If you are buying blank die stock for a thermal-transfer printer, 4×6 and 4×4 cover nearly everything.

The ANSI Z535.4 layout

A compliant template follows ANSI Z535.4, the product-safety-label standard:

1. Signal-word header. Use the equipment owner’s documented ANSI Z535-style hazard-communication policy. IEEE 1584 does not establish an automatic WARNING/DANGER threshold; this tool uses WARNING by default.
2. Hazard symbol. The arc-flash pictogram, so the label reads before the text does.
3. Message panel. The data fields, printed large enough to read at arm's length:
   • Nominal system voltage
   • Arc-flash boundary
   • Incident energy at the working distance, the PPE level, or both
   • The date the assessment was completed (new in NEC 2026 — not the print date)
   • A study/label ID with issue date for traceability
   • Available fault current and the date it was obtained (NEC 110.24 practice)

The field-by-field requirements, with the NEC 2026 §110.16 vs NFPA 70E §130.5(H) comparison, live on the arc flash label requirements page.

What the template is printed on

Layout is half the job; the other half is material and print method. The repeated spec language across public project manuals:

• UL 969 adhesive stock — polyester or vinyl, UV-resistant.
• Thermal-transfer, machine printed — "no field markings." Hand-written values fail spec'd jobs.
• Direct-thermal desktop printers fade and are not UV-stable. Indoor-only, at your own risk.

The free interactive template: how the maker works

A blank template still makes you do the math and the typing. The maker on this site works the other way around — the template fills itself from the calculation:

1. Enter your panel specs in the free arc flash calculator: voltage, available fault current, protective-device clearing time, electrode configuration. Missing the fault-current number? What is available fault current shows three ways to find it.
2. The engine computes the label values with the IEEE 1584-2018 method — incident energy, arc-flash boundary, and minimum arc-rating basis — and shows every intermediate value so you can review the calculation. Category-method fallbacks are labeled separately and do not invent an incident-energy value.
3. Preview the label in your browser. The preview renders the exact ANSI Z535.4 layout above, sized for standard die stock, with a print-ready PDF.

The calculator and the preview are free. The free PDF carries a watermark; a label pack — 10 credits for $19, credits never expire — removes it, and one credit covers one panel's clean label PDF plus its energized-work permit PDF, re-downloadable free later. No subscription required for occasional panels.

Using the template responsibly

Two rules before you print:

• The template does not make the numbers right. It formats them. The incident-energy value is only as good as the fault-current and clearing-time inputs — the calculator shows the intermediate values precisely so you can verify them.
• Match the label to the assessment date. When the system changes — a service upgrade, a transformer swap — re-run the calculation and reprint. NFPA 70E caps the review interval at five years even when nothing changes.

When you are pricing whether a full engineering study makes more sense than per-panel labels, the honest numbers are on the arc flash study cost page.