Arc-Rated Clothing: The Foundation of Arc Flash Protection

In the world of electrical safety, there’s no compromise—especially when it comes to arc flash. For electricians, maintenance teams, and utility workers, arc-rated clothing is the most critical layer of protection against sudden electrical energy releases.

Arc-rated garments don’t just resist fire—they’re engineered to absorb and block intense thermal energy in milliseconds. Without them, even a brief arc flash can cause life-altering burns or worse.

What Makes Clothing Arc-Rated?

Arc-rated clothing is a special type of flame-resistant (FR) garment tested to withstand the thermal energy generated by an arc flash. It’s designed not only to self-extinguish when exposed to flame, but more importantly, to prevent burn injuries from high-heat electrical blasts.

What makes it arc-rated:

• Fabrics are tested to ASTM F1959 for resistance to arc energy
• They receive a measured Arc Thermal Performance Value (ATPV) or Energy Breakopen Threshold (EBT)
• Garments are labeled with arc rating in calories/cm², so users can match PPE to incident energy levels

Arc-rated clothing must be part of a complete PPE system and is typically worn as the base layer in arc flash zones.

Differences Between FR Clothing and Arc Flash Clothing

Many people confuse “FR” clothing with “Arc-Rated” clothing, but there’s a key difference.

✅ Bottom line: All arc-rated clothing is FR, but not all FR clothing is arc-rated. Make sure what you’re buying is explicitly arc-rated with a labeled ATPV/EBT rating.

ATPV Ratings and Fabric Layers Explained

ATPV (Arc Thermal Performance Value) measures the amount of arc energy (in cal/cm²) a fabric can absorb before the wearer would suffer second-degree burns.

For example:

• ATPV 4 cal/cm² = minimum for Category 1 tasks
• ATPV 8 cal/cm² = suitable for Category 2
• Higher ratings (25+ cal/cm²) = for Category 3 or 4

Layering matters:
Wearing arc-rated garments in multiple layers can significantly increase overall protection. For example, a base layer shirt + coverall system may provide 12–20 cal/cm² protection depending on fabric and configuration.

Tips:

• Never layer non-FR garments under arc gear (they can melt to the skin)
• Garments must cover all exposed skin for full-body protection
• Always check combined ATPV values for layered systems

Shirt, Pants, and Coveralls: What to Choose Based on Task

Arc-rated clothing is available in various configurations depending on work needs, comfort, and protection level.

Choose based on task and environment:

Fit and comfort also matter:

• Garments should be loose-fitting enough to allow an air barrier (adds thermal insulation)
• Moisture-wicking and breathable materials are ideal for long shifts
• Look for gusseted shoulders, reinforced seams, and double-layer collars for durability

Key Standards: ASTM F1506 and NFPA 70E

Two key standards define arc-rated clothing requirements in North America:

🔹 ASTM F1506

This standard outlines performance requirements for textiles used in arc-rated clothing, including:

• Fabric’s ability to self-extinguish
• No melting or dripping
• Labeling with ATPV or EBT value

🔹 NFPA 70E

The NFPA 70E standard defines:

• Electrical safety work practices
• Arc flash boundaries and PPE categories (CAT 1–4)
• Minimum PPE for tasks based on hazard level
• Risk assessment and documentation requirements

For buyers and safety managers, verifying that garments meet both ASTM and NFPA 70E is non-negotiable. Reputable manufacturers will provide test reports and compliance documentation upon request.

Maintenance and Laundering Tips for Arc Clothing

Proper care extends the life and performance of arc-rated garments. Poor maintenance can degrade the fabric’s protective properties.

Washing Guidelines:

• Use mild detergent; avoid bleach, softeners, and starch
• Wash separately from other garments
• Use warm or cold water—not hot
• Tumble dry on low heat or hang dry

Inspection Checklist:

• Look for frayed edges, holes, and worn areas
• Check for faded labels (you must be able to read ATPV rating)
• Inspect closures, seams, and stitching
• Replace if contaminated with oils or flammable chemicals

⚠️ Important: Never wear damaged or contaminated arc-rated gear—it won’t protect you in an arc flash.

Conclusion

Arc-rated clothing is the first and most critical defense for any worker exposed to arc flash hazards. It protects against severe burns, enables safe evacuation, and ensures compliance with regulatory standards.

When sourcing arc flash clothing, make sure you’re choosing gear that is:

• Properly rated and labeled
• Tested to ASTM and NFPA standards
• Comfortable enough for real-world daily wear
• Supported by reliable documentation from your supplier

Need help choosing the right gear for your facility or team? I can help you match garments to hazard levels, tasks, and certification needs—so your crew stays safe, comfortable, and compliant.

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