In NFPA 704, what does a rating of 4 indicate?

In NFPA 704, what does a rating of 4 indicate?

• A. The greatest hazard level for that category.
• B. No hazard at all for that category.
• C. A low hazard level for that category.
• D. Moderate hazard level for that category.

Answer: (A)

NFPA 704 uses a numeric scale for Health, Flammability, and Instability, where higher numbers mean greater danger in that category. A rating at the top end signals the most severe hazard possible in that category, meaning extreme risk and the need for maximum protective measures and precautions. That’s why this rating is interpreted as the greatest hazard level for that category. The other end of the scale indicates little to no hazard, and intermediate numbers indicate moderate levels, but none of those fit the highest level.

NFPA 704 uses a numeric scale for Health, Flammability, and Instability, where higher numbers mean greater danger in that category. A rating at the top end signals the most severe hazard possible in that category, meaning extreme risk and the need for maximum protective measures and precautions. That’s why this rating is interpreted as the greatest hazard level for that category. The other end of the scale indicates little to no hazard, and intermediate numbers indicate moderate levels, but none of those fit the highest level.