What is the minimum arc rating (in cal/cm2) required for arc flash PPE Category 2 clothing?

What is the minimum arc rating (in cal/cm2) required for arc flash PPE Category 2 clothing?

• A. 4 cal/cm2
• B. 6 cal/cm2
• C. 8 cal/cm2
• D. 12 cal/cm2

Answer: (C)

Arc flash PPE is rated by the energy level the fabric can withstand before igniting. Category 2 clothing is intended for incident energies roughly between 4 and 10 cal/cm2. The minimum arc rating for clothing in this category is 8 cal/cm2, which provides protection for the mid-to-upper part of that range. A rating of 4 cal/cm2 would only meet Category 1 requirements, not Category 2. A 6 cal/cm2 rating isn’t established as the minimum for Category 2, and while 12 cal/cm2 would offer more protection, it’s beyond the minimum needed. In practice, you choose arc-rated clothing with at least the energy level expected (and often add extra margin), along with appropriate eye/face and hand protection.

Arc flash PPE is rated by the energy level the fabric can withstand before igniting. Category 2 clothing is intended for incident energies roughly between 4 and 10 cal/cm2. The minimum arc rating for clothing in this category is 8 cal/cm2, which provides protection for the mid-to-upper part of that range. A rating of 4 cal/cm2 would only meet Category 1 requirements, not Category 2. A 6 cal/cm2 rating isn’t established as the minimum for Category 2, and while 12 cal/cm2 would offer more protection, it’s beyond the minimum needed. In practice, you choose arc-rated clothing with at least the energy level expected (and often add extra margin), along with appropriate eye/face and hand protection.