Arc Flash Safety: Identify, Label, and Protect

What Is Arc Flash?

Arc flash is a dangerous electrical event that occurs when electrical current leaves its intended path and travels through the air between conductors or energized equipment. These events can release intense heat, blinding light, loud blasts, and dangerous debris within seconds.

These incidents can cause severe burns, permanent injuries, equipment damage, and fatalities. In 2024, the U.S. Bureau of Labor Statistics (BLS) reported 130 deaths from electrical exposure. Understanding what causes arc flash events is one of the first steps toward reducing electrical hazards and improving workplace safety.

Causes of Arc Flash

An arc flash incident can be triggered by numerous factors, including: 

• Equipment failure 
• Accidental contact with electrical conductors  
• Improper maintenance 
• Dust or corrosion on electrical components 
• Improper installation of parts 

When these conditions occur, electrical insulation and protective barriers can fail—leading to an arc flash event. 

The Importance of Arc Flash Safety

An arc flash hazard poses serious risks to both people and property. Arc flash heat can cause severe burns, while the blast pressure may result in serious injuries or fatalities. The high temperatures and pressure created by an arc flash incident can damage equipment. This can result in costly downtime and equipment repairs. Effective arc flash safety practices protect workers and reduce workplace electrical risks.

Reducing arc flash risks requires proper training, established safety procedures, and compliance with recognized electrical safety standards. 

Understanding the Role of NFPA in Arc Flash Safety

The National Fire Protection Association (NFPA) plays a crucial role in establishing standards and regulations aimed at improving workplace safety in various industries, including electrical work. NFPA 70E outlines safety practices for protecting workers from electrical hazards, including arc flash exposure.

This standard outlines:  

• Safety procedures 
• Training requirements 
• Protective measures 

NFPA 70E is designed to reduce arc flash risks and workplace electrical injuries. Compliance with NFPA 70E is essential for employers and employees working with or near electrical equipment. Following these standards helps organizations reduce electrical risks and workplace injuries. 

NFPA 70E is often referenced by regulatory agencies such as the Occupational Safety and Health Administration (OSHA) in developing safety regulations. Understanding NFPA standards supports regulatory compliance and safer electrical work practices. Facilities must apply these standards consistently to reduce electrical hazards and improve workplace safety. 

• Evacuation routes
• Emergency shutdown protocol
• Medical response procedure

Conduct regular drills so employees can respond quickly during an arc flash emergency.

Give regular training and education: Provide ongoing training and education on NFPA 70E arc flash standards, arc flash risks, and safety procedures to all employees involved in electrical work. Promote ongoing safety participation and accountability across the facility.

Organizations can significantly enhance arc flash safety in the workplace, protect employees from harm, and promote a culture of electrical safety awareness and compliance by carrying out these strategies and complying with NFPA 70E arc flash standards. 

Labeling the Arc Flash with the NFPA 70E Standard

Arc flash labels play a critical role in workplace electrical safety. Facilities should understand arc flash labeling requirements, safety signs, why clear labels matter, and labeling standards.  

The NFPA sets rules for arc flash labels with the NFPA 70E standard. These requirements keep labels consistent and easy to understand across facilities. The standard defines required label content, formatting, and placement. Following these standards supports safer visual communication throughout the facility.

Arc Flash Sign and Label Requirements

The arc flash risk assessment determines the information required on arc flash labels, including the arc flash boundary and the protection information needed before energized work begins.

Each arc flash label must include: 

• Nominal system voltage—Identifies the equipment’s operating voltage.
• Arc flash boundary—Identifies the distance where a worker could be exposed to a second-degree burn hazard during an arc flash event.
• Available incident energy or minimum required arc-rated PPE—Provides the information needed to select proper protection.
• Date of arc flash risk assessment—Shows when the hazard analysis was last updated.

Labels should not include both calculated incident energy and arc flash PPE category, because these values come from different arc flash evaluation methods. Including both may create confusion or conflicting safety recommendations.

Arc flash labels may also include additional information, such as equipment identification, shock protection boundaries, limited approach boundaries, or restricted approach boundaries. In addition to the information provided on the label, effective arc flash labels often adhere to a standardized format outlined in the ANSI Z535 standard. This approach uses colored headers and signal words to improve hazard recognition and readability.

Properly labeling equipment and areas where an arc flash incident may occur can make a sizable difference in reducing the amount of electrical hazard injuries and fatalities. In addition to proper labeling, facilities must follow OSHA electrical safety requirements to reduce workplace exposure risks.

OSHA Arc Flash Compliance: Key Safety Requirements

Compliance with OSHA regulations is essential for maintaining a safe work environment and protecting employees from an arc flash accident. OSHA provides specific guidelines and regulations for electrical safety, including measures to prevent arc flash. 

General duty clause: OSHA's General Duty Clause, Section 5(a)(1) of the Occupational and Health Act, requires employers to provide a workplace free from dangers—such as arc flash hazards—that are likely to cause death or serious physical harm. This requires employers to identify and mitigate potential electrical hazards.

Signage and labeling electrical safety standards: OSHA's electrical safety standards for signage and labeling, outlined in 29 CFR 1910.303, states that electrical equipment must be marked with warning signs, labels, or other means to warn employees of potential electrical hazards. According to OSHA 29 CFR 1910.335, workers must also be warned if they are working near electrical hazards. 

NFPA 70E incorporation: OSHA frequently references NFPA 70E as an industry-recognized electrical safety standard. While NFPA 70E itself is not an OSHA regulation, OSHA uses it to determine if employers are following electrical safety guidelines.

Training requirements: OSHA mandates that employers provide training to employees who may be exposed to electrical hazards.  

Training should cover topics such as:  

• Electrical safety procedures 
• Hazard recognition  
• Use of arc flash PPE 
• Emergency response protocols 

Employers must provide workers with training on electrical hazards and safe work practices.

Recordkeeping and documentation: OSHA requires employers to maintain records of electrical safety training, hazard assessments, and incident investigations related to arc flash hazards. Employers must document hazard corrections and OSHA compliance efforts.

OSHA compliance efforts should include regular audits, electrical safety training, hazard assessments, and updated arc flash labeling practices. Beyond compliance, facilities should implement proactive controls that reduce the likelihood of arc flash incidents occurring in the first place.  

How to Prevent an Arc Flash

Labels and procedures alone cannot eliminate electrical risks. Facilities can reduce arc flash risks through several preventive measures, including:

• Engineering controls  
• Lockout tagout procedures 
• Administrative controls  
• Personal protective equipment requirements 

Making Equipment Safer from Arc Flashes

Engineering controls are ways to make equipment safer and reduce the chances of an arc flash incident. This includes using specialized equipment that can handle arc flashes safely or regularly checking equipment to catch problems early.  

Some special equipment that can safely handle arc flashes includes: 

• Arc-resistant switchgear 
• Circuit breakers with arc fault protection 
• Arc-resistant motor control centers 

This equipment helps contain and redirect arc energy during an electrical event which reduces the likelihood of injury or damage should an arc flash incident arise.

Companies can lower the risk of arc flashes by providing the right equipment for workers who may be at risk from exposure to electricity. 

Lockout Tagout Procedures 

LOTO procedures are in place for stopping electrical equipment from turning on accidentally during maintenance. Before starting any work on electrical equipment, workers must follow LOTO steps to ensure arc flash safety:

1. Inform all impacted employees that the equipment will be locked out 
2. Identify all sources of electrical power to the equipment 
3. Shut down the equipment 
4. Disconnect the equipment from its energy sources 
5. Relieve any stored energy by grounding, attempting to start the equipment, or other methods 
6. Attach lockout/tagout devices to energy-isolating points 
7. Use a testing tool to confirm the equipment is de-energized 
8. When needed, install a grounding device to remove the risk of induced or stored voltage 

Following the LOTO process helps prevent arc flashes caused by equipment turning on unexpectedly.

Administrative Controls for Arc Flash Safety 

Administrative controls include rules, procedures, and training to protect workers from an arc flash accident. This includes: 

• Teaching workers how to do their jobs safely 
• Holding regular safety meetings 
• Planning for emergencies 

Clear procedures and electrical safety training help reduce workplace incidents.

Personal Protective Equipment Requirements

Employers must make sure workers know how to choose and use arc flash PPE correctly and provide enough gear for everyone who needs it. By wearing the right PPE, workers can reduce their chances of getting hurt in an arc flash hazard. 

Companies can prevent arc flashes and make workplaces safer for everyone by using engineering controls, following LOTO procedures, implementing administrative controls, and providing arc flash PPE. 

Training and Education to Keep Workers Safe 

Training and education are essential components of arc flash prevention. Workers need to understand the risks associated with arc flashes and know how to work safely around electrical equipment. Training programs should cover topics, such as: 

• Hazard recognition 
• Safe work practices  
• Emergency response procedures 
• Proper use of protective equipment  

Effective training helps workers recognize hazards and follow safe electrical work practices. With impactful training, workers become better prepared to identify and avoid electrical hazards.

Know the Arc Flashes

Arc flash events vary in severity and behavior depending on working conditions. There are four types of arc flashes that can occur in any facility: 

• Open-air arc flash 
• Arc-in-a-box  
• Ejected arc 
• Tracking arc 

Types of Arc Flash Incidents

Open-Air

Open-air arc flashes occur when electricity travels through the air between exposed conductors or energized equipment. Equipment failures, inadequate maintenance, and human error commonly contribute to these events in industrial environments.

Arc-in-a-box 

Arc-in-a-box testing evaluates how enclosed equipment responds during an arc flash event. This testing helps improve electrical safety standards, protective equipment performance, and arc-resistant equipment design.

Ejected Arc 

An ejected arc occurs when hot plasma and arc energy are forcefully expelled toward a worker during an arc flash event. These incidents are especially dangerous in high-voltage environments where arc energy levels are significantly greater.

Tracking Arc 

Tracking arcs occur when electrical current or plasma travels along a worker’s skin, clothing, or another conductive surface. These events reinforce the importance of proper arc flash PPE and established electrical safety procedures during energized work.

All arc flash events present serious safety risks and can cause serious injuries and damage. Be cautious when working with or around an electrical environment. Arc flash incidents can occur in a wide range of industrial and commercial environments.

Commercial Buildings 

Commercial buildings, including offices, retail facilities, and healthcare environments, still contain energized electrical equipment that may present arc flash risks. Panelboards, transformers, switchgear, overloaded circuits, and poor maintenance practices can contribute to electrical hazards in these settings.

Facilities can reduce the risk of accidents and create safer environments for workers and the public once they understand where arc flashes happen and implement appropriate safety measures. 

DuraLabel Solutions to Reduce Arc Flash

Arc flash hazards can cause severe injuries, equipment damage, and operational downtime if proper electrical safety controls are not in place. Reducing these risks requires proper labeling, worker training, arc flash risk assessments, and compliant safety procedures.

Facilities can ensure the safety of their workers with proper arc flash labels and signs. The DuraLabel^® Kodiak^® Max Industrial Sign and Label System helps facilities create durable arc flash labels, OSHA signage, and electrical safety markings for compliant workplaces.

Get help building a safer electrical safety system for your facility. Call 1-888-789-7964 and one of our experts will guide you through the process.  

Conduct an arc flash risk assessment and create custom labels with guidance from DuraLabel’s free Arc Flash Labeling Quick Start Guide. This resource helps facilities evaluate electrical safety conditions and keep arc flash labels current and compliant. 

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