Virtual arc flash labels and NFPA 70E 130.5(H)

PowerStudyIQ hosts your arc flash study results as a live equipment database. A QR code mounted at each piece of equipment opens that equipment's current hazard data on any phone — one central record instead of hundreds of printed stickers that go stale the day the study changes.

Last updated 2026-07-27

What NFPA 70E 130.5(H) requires

NFPA 70E 130.5(H) requires a label on electrical equipment that is likely to be examined, adjusted, serviced, or maintained while energized — switchboards, panelboards, industrial control panels, meter socket enclosures, motor control centers, and similar equipment outside dwelling units.

The label has to carry the nominal system voltage and the arc flash boundary. It also has to carry at least one of three things: the available incident energy together with the working distance it was calculated at, or the arc flash PPE category — but not both of those; the minimum arc rating of clothing; or a site-specific level of PPE.

The 2024 edition added that the label be durable enough for the environment it lives in.

Two requirements sit alongside the label content and are easy to overlook. The method used to calculate the values and the data behind them have to be documented. And the equipment owner — not the engineer who performed the study — is responsible for documenting, installing, and maintaining the label.

What Exception No. 2 permits

Exception No. 2 to 130.5(H) has been in NFPA 70E since the 2018 edition. It applies to supervised industrial installations where the conditions of maintenance and engineering supervision are such that only qualified persons monitor and service the system. Where those conditions hold, the information that would otherwise be marked on the label may instead be documented in a way that is readily available to the people likely to examine, service, maintain, or operate that equipment while it is energized.

That is a narrower opening than it first appears, and it is worth being plain about why.

"Supervised industrial installation," "conditions of maintenance," and "engineering supervision" are terms with specific meanings, and a facility does not get to self-certify against them casually. Practitioners who work with this exception routinely caution that many installations cannot fully satisfy its conditions. Whether yours does is a determination for your organization, and it is worth making deliberately rather than by assumption.

The exception also relieves nothing outside NFPA 70E. It says nothing about the National Electrical Code, which is a separate requirement with a separate enforcement path. That is covered below.

How PowerStudyIQ fits

The product side, stated without the standard's language: every piece of equipment in your facility gets a record in the database — the values from your engineer's arc flash study, the equipment location, and the upstream isolation path. A QR code on the equipment opens that record. When a new study revises the numbers, the database is updated once and every QR code resolves to the new data the same moment. Nothing has to be reprinted, and nothing in the field can lag the study.

Exception No. 2 permits the required information to be documented in a manner readily available to qualified persons. PowerStudyIQ is one way to satisfy that: a permanently mounted QR code on the equipment, resolving to a live record of that equipment's study values, reachable on any phone without an app or a login.

What that arrangement addresses is the availability and currency of the documentation. The record is single-sourced, so a revised study updates every point of access at once, and there is no window during which a field reference disagrees with the study behind it.

What it does not do is make a facility compliant. Several things remain the facility's own responsibility, and no software changes that:

• Determining that the installation actually meets the conditions of Exception No. 2.
• Ensuring that only qualified persons monitor and service the system, and that this remains true over time.
• Commissioning and maintaining the underlying arc flash study, and reviewing its data on the required interval.
• Confirming that the documentation is genuinely readily available under the facility's real conditions — including whether personnel can reach it in the electrical rooms where they actually work.
• Meeting any applicable NEC marking requirement, which is separate from NFPA 70E.

The equipment owner remains responsible for the documentation, installation, and maintenance of the label. PowerStudyIQ is a tool for carrying that responsibility, not a transfer of it.

What this does not cover: the NEC

NFPA 70E and the National Electrical Code are separate instruments with separate enforcement. NFPA 70E is a work-practice standard, referenced by OSHA and enforced after an incident. The NEC is an installation code, adopted into law state by state and enforced by the authority having jurisdiction at inspection. An exception in one does not relieve a requirement in the other.

NEC 110.16 covers arc-flash hazard marking. Under the 2023 edition, the general requirement was a marking that warned qualified persons of the hazard, and a permanent label carrying more detail was required on service and feeder-supplied equipment rated 1,000 amperes or more.

The 2026 edition changed this materially. The section was retitled from "warning" to "marking," the required contents are now stated directly in the Code rather than by reference to industry practice, and the 1,000-ampere threshold was removed — the requirement now reaches all qualifying equipment regardless of rating. A generic hazard sticker no longer satisfies it.

Two practical consequences. First, these requirements are enforceable by an electrical inspector during routine inspection, not only by OSHA after an incident. Second, the NEC is not retroactive, so they attach to new installations and major modifications after the edition is adopted in your jurisdiction.

Which edition applies to you depends on what your jurisdiction has adopted, and adoption lags publication. Check with your AHJ before assuming either edition governs your facility.

The 5-year review cycle

The data behind an arc flash label, and the method used to calculate it, have to be documented and reviewed for accuracy at intervals not exceeding five years. Where that review identifies a change that renders a label inaccurate, the label has to be updated.

The distinction matters more than it looks. The requirement is not to relabel every five years. It is to review at least that often, and to correct whatever the review shows is wrong. Five years is a ceiling on the review interval, not a schedule for reprinting.

The more common trigger is a change to the system rather than the calendar. A transformer replacement, a protective device swap, or a settings change can alter the analysis and invalidate what a label says long before five years have passed. The 2024 edition added an informational note pointing at exactly these examples.

This is the part that printed labels handle badly. A settings change on Tuesday invalidates every downstream label, and the interval between that change and the reprint is a window where the sticker on the equipment disagrees with the study behind it. A single record removes that window: the study is revised once, and every point of access reflects it immediately.

Where the study comes from

PowerStudyIQ does not perform arc flash calculations. It hosts and maintains the results of a study performed by a licensed engineer — yours, or ours: PowerStudyIQ is built by the team behind PowerSafe Engineering, LLC, an electrical engineering firm whose practice centers on power system studies. Read their write-up on virtual labels: Virtual Arc Flash Labels and QR Codes: What NFPA 70E Actually Allows.