Field guide
Generic vs Detailed Arc Flash Labels: What NEC 2026 Kills
There are two kinds of arc-flash markings in the field. The generic warning sticker says, in effect, "Warning: arc flash hazard, wear PPE." The detailed label tells you the actual hazard for that equipment: nominal voltage, incident energy or PPE level, arc-flash boundary, and — new in NEC 2026 — the date the assessment behind it was completed. NEC 2026 §110.16 ends the first kind as a compliance answer for non-dwelling service and feeder equipment. Last reviewed: July 18, 2026.
Side by side
| Generic warning sticker | Detailed label | |
|---|---|---|
| Message | A hazard exists somewhere | The assessed hazard of this equipment |
| Voltage | Not stated | Nominal system voltage |
| Incident energy / PPE level | Not stated | cal/cm² at working distance, category, or both |
| Arc-flash boundary | Not stated | Distance in inches/mm |
| Assessment date | Not stated | Required under NEC 2026 §110.16 |
| What a worker can do with it | Feel vaguely warned | Choose PPE, set the boundary, decide whether to work |
| NEC 2026 compliance | No | Yes, when fields are present and current |
Why the sticker persisted — and why it is finished
The sticker survived because it was cheap and because the earlier code text left room: before NEC 2026, the detailed-label requirement reached only equipment at 1,000 A and above, so a generic warning was the path of least resistance below it. Two changes closed that room. The 1,000 A threshold was removed, bringing essentially all non-dwelling service and feeder equipment into scope. And the assessment-date requirement made the label a dated record — a sticker has nothing to date.
The deeper problem with the sticker is that it transfers the work. "Wear PPE" with no values asks the electrician to invent the risk assessment at the door, under time pressure, with no inputs. That is not a warning; it is a liability transfer. The detailed label moves the analysis to before the work order, where it belongs.
What "detailed" has to include
Pulling NEC 2026 §110.16 and NFPA 70E §130.5(H) together:
- Nominal system voltage — checked against the equipment in front of the worker.
- Arc-flash boundary — the distance line for unqualified people.
- Incident energy, PPE level, or both — the number the clothing decision is made from.
- Assessment completion date — the NEC 2026 addition; the field that makes a stale label visible.
- Traceability — a study or label ID; standard practice on spec'd work.
The full field-by-field tables, including print and material requirements, are on the label requirements page. If your facility still carries stickers, the conversion path is short: calculate per panel (the free calculator does the IEEE 1584-2018 math), print on proper stock (the label template page covers sizes and materials), and date the assessment. NEC 2026 arc flash labels covers the adoption picture.
Direct answers
Frequently asked questions
What is a generic arc flash label?
A warning sticker that says a hazard exists but carries no equipment-specific values — no voltage, no incident energy, no boundary, no assessment date. NEC 2026 §110.16 no longer accepts it for non-dwelling service and feeder equipment.
What makes an arc flash label "detailed"?
Equipment-specific assessed values: nominal voltage, arc-flash boundary, incident energy or PPE level, and the assessment completion date, plus traceability via a study or label ID.
Are my old generic stickers illegal now?
They fail NEC 2026 wherever that edition is adopted, and they never satisfied NFPA 70E §130.5(H)'s detailed-label requirement after a risk assessment. Replace them with calculated, dated labels.
Source trail
Sources
Standards references identify the applicable document or section where possible. Standards text may require licensed access. Report a factual issue through the process on our corrections page.