Arc flash hazards are consistently one of the biggest dangers facing electrical workers. Unlike typical shock events, they can release massive amounts of thermal energy, pressure, sound and molten metal in milliseconds. Temperatures at the source can often exceed 35,000°F. That’s hotter than the surface of the sun. Workers caught within arc flash boundaries can suffer severe burns, hearing damage, blindness or fatal injuries. Electrical safety measures are seeking to minimize the number of occurrences and the severity of events.  

While electrical safety has improved significantly through advancements in personal protective equipment (PPE), training and hazard assessment practices, arc flash incidents continue to happen. As a result, the 2026 edition of the National Electrical Code includes revisions aimed at improving hazard communication prior to performing tasks involving energized electrical equipment.

As a quick refresher, an arc flash occurs when electrical current leaves its intended path and travels through the air between conductors or from a conductor to ground. They are often caused by equipment failure, loose connections, dropped tools, insulation breakdown, contamination, improper maintenance or human error. Arc flashes can generate intense pressure waves capable of throwing workers across rooms, damaging internal organs and causing traumatic injuries. Molten metal and shrapnel may also be discharged from electrical equipment.

According to the Occupational Safety and Health Administration and NFPA guidance, “Arc flash hazards must be evaluated whenever workers are exposed to energized conductors or circuit parts that could become energized. OSHA’s electrical safety requirements reference the need for arc flash protection and hazard assessment, while NFPA 70E provides the primary framework for evaluating incident energy, establishing boundaries, and selecting PPE.”

For years, the industry has focused on reducing arc flash risk through engineering controls, proper maintenance, lockout/tagout (LOTO) procedures and arc-rated PPE. However, one recurring challenge has been ensuring workers always have accurate hazard information available.

Equipment labeling

Proper equipment labeling is an effective tool for communicating electrical hazards. Historically, NEC Section 110.16 required arc flash warning labels on certain service equipment and feeder-supplied equipment, particularly larger systems. Unfortunately, the requirements leave too much room for interpretation and provide little practical information to workers.

The 2026 NEC attempts to address this by transforming arc flash labels from simple warnings into actionable safety tools. The revised language under Section 110.16 expands labeling requirements. It removes previous limitations for large service equipment and includes equipment likely to require examination, adjustment, servicing or maintenance while energized. 

Additionally, systems that previously carried minimal labeling may now require more comprehensive communication about the hazards. The 2026 NEC specifies several pieces of information that must appear on markings, including nominal system voltage, arc flash boundary, available incident energy or required PPE level, and date of the arc flash assessment.

NFPA 70E plays a role too

While the NEC governs installation requirements, NFPA 70E addresses safe work practices. NFPA 70E requires employers to perform arc flash risk assessments and review them periodically. It also requires the use of arc-rated PPE when workers are exposed to arc flash hazards. 

The new NEC labeling provisions help bridge the gap between installation requirements and workplace safety practices by ensuring hazard information is available directly on the equipment. This synchronization is helpful because even tasks associated with creating an electrically safe work condition often involve some degree of energized exposure. 

Although adoption of the 2026 NEC will occur on a state-by-state basis, employers should begin preparing now. To start, they should review their existing arc flash programs to determine whether equipment currently labeled under earlier code requirements will comply with the new ones. Secondly, employers should ensure workers understand the information presented on arc flash labels. Labels are only effective if workers know how to interpret them.

Additionally, employers should coordinate closely with engineers, facility owners and safety professionals when designing new systems. The expanded labeling requirements may affect project scope, commissioning procedures and long-term maintenance planning. 

Employers should understand that labels are not a substitute for safe work practices. LOTO, proper maintenance, risk assessments and training are critical elements of effective electrical safety programs.

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