What is an Arc Rating?

What is an arc rating?

This is the second post in a six-part “Fundamentals of Arc Flash” series. Check back regularly to read new posts offering valuable information on topics such as arc flash causes and characteristics, ratings, and analysis.

Flame resistant (FR) clothing is critical in the presence of an arc flash hazard because it will not ignite and continue to burn. This can save your life! Arc-rated FR clothing also performs a second function, insulating you against the hazard so that you’re not burned through the fabric. So what’s an arc rating? Simply stated, an arc rating is a direct measure of that fabric’s ability to insulate the wearer from second-degree burn through the fabric. The higher the arc rating, the more protective the garment.

Watch as Scott Margolin, Vice President of Technical, explains:

As Scott makes clear, the key is to wear clothing with an arc rating greater than the incident energy the equipment you’re working on is capable of generating, or the hazard analysis for the task at hand. As long as you do that, you can be sure you won’t be burned.

ASTM F1959, Standard Test Method for Determining Arc Thermal Performance (Value) of Textile Materials for Clothing by Electric Arc and Related Thermal Hazards, is the test method used to calculate a given fabric’s arc rating—that is, to measure the thermal protection the fabric provides in an arc flash.

By the way, did you know there are two types of arc ratings? Look out for our upcoming blog post (coming soon!) to learn more about the difference between ATPV and EBT arc ratings.

Need some new arc-rated clothing to stay safe on the job? Shop with us today at www.TyndaleUSA.com or give us a call at 800-356-3433.

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