A garment's arc rating is its maximum incident energy resistance demonstrated prior to material breakdown, or at the onset of a second-degree skin burn. What term describes this property?

A garment's arc rating is its maximum incident energy resistance demonstrated prior to material breakdown, or at the onset of a second-degree skin burn. What term describes this property?

• A. Arc rating
• B. Thermal rating
• C. Dielectric strength
• D. Insulation value

Answer: (A)

Arc rating is the measure of how much arc energy a garment can withstand before it breaks down or before a second-degree burn would begin on bare skin. This rating, usually expressed in cal/cm^2, reflects the incident energy the fabric has been shown to tolerate without exposing the wearer to significant injury. In practice, you use this rating to match PPE to the expected arc flash hazard; a higher arc rating means the garment provides protection against higher-energy arcs. Thermal rating isn’t the standard label for this kind of protective performance; it’s a more general term for heat resistance and doesn’t specifically describe arc-induced injuries. Dielectric strength refers to voltage-based insulating performance of a material and isn’t about protecting skin from arc energy. Insulation value relates to thermal insulation of clothing, not the fabric’s resistance to arc-induced burns.

Arc rating is the measure of how much arc energy a garment can withstand before it breaks down or before a second-degree burn would begin on bare skin. This rating, usually expressed in cal/cm^2, reflects the incident energy the fabric has been shown to tolerate without exposing the wearer to significant injury. In practice, you use this rating to match PPE to the expected arc flash hazard; a higher arc rating means the garment provides protection against higher-energy arcs.

Thermal rating isn’t the standard label for this kind of protective performance; it’s a more general term for heat resistance and doesn’t specifically describe arc-induced injuries. Dielectric strength refers to voltage-based insulating performance of a material and isn’t about protecting skin from arc energy. Insulation value relates to thermal insulation of clothing, not the fabric’s resistance to arc-induced burns.