Virtual Arc Flash Labels and QR Codes: What NFPA 70E Actually Allows

Walk through any modern industrial facility and you will see arc flash warning labels affixed to switchboards, panelboards, motor control centers, and meter sockets. These labels carry the specific hazard data a qualified person needs before working on energized equipment: nominal system voltage, arc flash boundary, incident energy, and the corresponding personal protective equipment. The labels exist because NFPA 70E requires them, and because the cost of getting hazard information wrong is measured in burned skin, ruined eyes, and funerals.

But these labels have a problem. They go out of date. The moment a transformer is replaced, a breaker is upsized, or a system change shifts the available fault current, the printed values on a sticker can become inaccurate. Arc flash studies are required to be reviewed at least every five years, and any changes that render the label inaccurate require the label to be updated. In a facility with hundreds of pieces of equipment, that means a constant cycle of reprinting and reapplying physical stickers, often by an outside engineering firm.

There is another way, and it has been hiding in plain sight in the standard since 2018. NFPA 70E 130.5(H) Exception No. 2 permits supervised industrial installations to document arc flash hazard information in a manner that is readily available to qualified persons, in lieu of traditional physical labels. With the advent of QR codes, smartphones, and cloud-based databases, this exception unlocks a fundamentally different way to manage arc flash compliance: the virtual arc flash label.

This post walks through what the standard actually says, what the exception actually allows, and how PowerStudyIQ uses these provisions to help industrial facilities keep arc flash data accurate and accessible.

What NFPA 70E 130.5(H) Actually Says

The labeling requirement in the 2024 edition of NFPA 70E reads as follows. The text below is reproduced verbatim from the standard:

(H) Equipment Labeling. Electrical equipment such as switchboards, panelboards, industrial control panels, meter socket enclosures, and motor control centers that are in other than dwelling units and that are likely to require examination, adjustment, servicing, or maintenance while energized shall be marked with a label containing all the following information:

•         (1) Nominal system voltage

•         (2) Arc flash boundary

•         (3) At least one of the following:

◦          a. Available incident energy and the corresponding working distance, or the arc flash PPE category in Table 130.7(C)(15)(a) or Table 130.7(C)(15)(b) for the equipment, but not both

◦          b. Minimum arc rating of clothing

◦          c. Site-specific level of PPE

These three items, in some combination, define the minimum content of an arc flash equipment label. The standard then defines two exceptions and a set of administrative requirements:

Exception No. 1: Unless changes in electrical distribution system(s) render the label inaccurate, labels applied prior to the effective date of this edition of the standard shall be acceptable if they complied with the requirements for equipment labeling in the standard in effect at the time the labels were applied.

Exception No. 2: In supervised industrial installations where conditions of maintenance and engineering supervision ensure that only qualified persons monitor and service the system, the information required in 130.5(H)(1) through 130.5(H)(3) shall be permitted to be documented in a manner that is readily available to persons likely to perform examination, servicing, maintenance, and operation of the equipment while energized.

The standard then closes with the administrative requirements that apply regardless of whether labels are physical or documented:

The method of calculating and the data to support the information for the label shall be documented. The data shall be reviewed for accuracy at intervals not to exceed 5 years. Where the review of the data identifies a change that renders the label inaccurate, the label shall be updated. The label shall be of sufficient durability to withstand the environment involved. The owner of the electrical equipment shall be responsible for the documentation, installation, and maintenance of the marked label.

What Exception No. 2 Unlocks

Exception No. 2 is the part of the code that most facility managers and electrical engineers have not fully digested. Read carefully, it allows the entire body of arc flash hazard information to be documented digitally rather than printed on a sticker, provided four conditions are met.

First, the installation must be a supervised industrial installation. This is a defined term in the National Electrical Code and NFPA 70E. It refers to industrial facilities where conditions of maintenance and engineering supervision are in place. Most large manufacturing plants, paper mills, packaging facilities, refineries, and similar industrial operations qualify. Office buildings, retail spaces, and dwelling units do not.

Second, only qualified persons must monitor and service the system. NFPA 70E defines a qualified person as one who has demonstrated skills and knowledge related to the construction and operation of electrical equipment and installations and has received safety training to identify the hazards and reduce the associated risk. In practice, this means the maintenance and engineering staff working on the equipment must be trained and credentialed appropriately. This is a facility-level commitment, not a software feature.

Third, the required information must be documented. The same content the standard requires on a physical label, nominal voltage, arc flash boundary, incident energy or its equivalents, must be captured in the digital documentation system. Nothing about the exception waives the content requirements. It only changes how the content is delivered.

Fourth, and this is the loaded phrase, the documentation must be readily available to persons likely to perform examination, servicing, maintenance, and operation of the equipment while energized. This is where QR codes earn their place. A QR code permanently affixed to the equipment, scanned with a phone, that resolves to the live arc flash data for that specific piece of equipment, is one of the most defensible interpretations of readily available the industry has produced. The qualified person, standing in front of the equipment, gets the current hazard data in seconds, without leaving the work location.

The exception does not, by itself, eliminate the need for a marking on the equipment. Something must be permanently affixed so the qualified person knows where to look. A QR code on a durable industrial label fits this role naturally. What the exception eliminates is the requirement that the printed text on that label carry the hazard data itself. The data lives in the documentation system, the QR code is the access point.

Why This Matters in Practice

The administrative section of 130.5(H) requires that label data be reviewed for accuracy at intervals not to exceed five years, and that any change rendering the label inaccurate must trigger an update to the label. In a facility of any meaningful size, this becomes the dominant cost of arc flash compliance. Every system change, every equipment swap, every utility-side fault current update can invalidate dozens of physical labels. The traditional response has been to commission a fresh study and send the engineer back out to print and apply new stickers.

Under Exception No. 2, the same change requires updating the documentation system, and the next person to scan the QR code sees the current data. No reprinting. No reapplication. No window of time during which a qualified person standing in front of the panel is reading values that no longer reflect reality.

There is a second-order benefit that is harder to quantify but worth naming. Physical labels degrade. They peel, they fade, they get covered with grease, they are torn off during maintenance and never reapplied. A label whose ink is illegible is, in the eyes of the standard, no better than no label at all. A QR code printed on industrial-grade material with appropriate error correction is more robust and, when paired with a digital backend, is also self-healing in a way physical labels are not. The data behind the code stays current automatically. The code itself can be reprinted and reapplied at low cost when the substrate degrades.

How PowerStudyIQ Implements This

PowerStudyIQ is built specifically around Exception No. 2 and the workflow it enables. The platform serves as the digital documentation system the exception requires, with several design choices that reflect the standard directly.

Each piece of electrical equipment in the facility is registered in the platform with a unique digital arc flash label. The label captures nominal system voltage, arc flash boundary, available incident energy, and working distance, satisfying the content requirements of 130.5(H)(1) through (3). The data is sourced from the facility's arc flash study, performed by a qualified person, and entered or imported into the platform as the source of truth.

Each piece of equipment also has a unique QR code. The QR code is printed on a durable label affixed to the equipment, suitable for the industrial environment. When a qualified person scans the code with any modern phone, they are taken directly to the live arc flash data for that specific piece of equipment, regardless of whether they are logged into PowerStudyIQ on that device. The hazard data appears in seconds, on the equipment, in the field, with no app installation required.

When the underlying study changes, the data is updated in PowerStudyIQ once. The next scan reflects the new values. The five-year review requirement of 130.5(H) is supported by the platform tracking the date of each study and surfacing equipment whose data is approaching the review window.

Beyond the label content itself, PowerStudyIQ also captures the upstream isolation path for each piece of equipment, helping qualified persons identify the lockout points required to de-energize the equipment safely. Emergency contact information, equipment identification, and other operational details are accessible from the same scan, in the same workflow, on the same screen.

The owner of the electrical equipment remains responsible for the documentation, installation, and maintenance of the marked label, as the standard makes clear. PowerStudyIQ is the tool that makes this responsibility tractable for facilities managing hundreds or thousands of pieces of equipment, and it is built specifically to honor the letter and the intent of NFPA 70E 130.5(H) Exception No. 2.

Closing

Exception No. 2 has been in NFPA 70E since the 2018 edition, and the language has been refined in each revision since. It exists because the standard's authors understood that printed labels are not the only way, or even the best way, to communicate hazard data to qualified persons in a supervised industrial setting. QR codes and cloud-based documentation systems were not the technology in mind when the exception was drafted, but they are the technology that makes the exception practical at scale.

Facilities that have not yet revisited their arc flash labeling program in light of Exception No. 2 are leaving real money on the table, in study reprint fees, in maintenance time spent reapplying degraded labels, and in the operational risk of outdated information sitting on equipment that has changed since the last study. The path forward is documented in the standard. The tools to make it practical are now available.

If you would like to talk through whether your facility qualifies for Exception No. 2, or how PowerStudyIQ might fit into your existing arc flash compliance program, contact PowerSafe Engineering.