What is the minimum fire extinguisher rating required for Class A fires on a construction site covering 6,000 square feet?
Correct Answer
C) 2-A rating extinguisher every 75 feet
OSHA requires 2-A rated fire extinguishers for Class A fires, with maximum travel distance of 75 feet to reach an extinguisher on construction sites.
Why This Is the Correct Answer
OSHA 29 CFR 1926.150 requires a minimum 2-A rated fire extinguisher for Class A fires on construction sites, with a maximum travel distance of 75 feet to any extinguisher. For a 6,000 square foot site, a 2-A extinguisher placed so that no worker is more than 75 feet away satisfies the OSHA requirement. This combination of minimum rating (2-A) and maximum travel distance (75 feet) is the specific OSHA-mandated standard for construction sites.
Why the Other Options Are Wrong
Option A: 4-A rating extinguisher every 75 feet
A 4-A rating exceeds the minimum required rating. While a higher-rated extinguisher provides more extinguishing capacity, OSHA specifies 2-A as the minimum. More critically, the travel distance specified — 75 feet — is actually correct. This option has the wrong rating (4-A is too high to be the minimum) paired with the correct distance.
Option B: 2-A rating extinguisher every 100 feet
While a 2-A rating is correct, the 100-foot travel distance violates OSHA requirements. OSHA limits maximum travel distance to 75 feet for Class A extinguishers on construction sites. Increasing the spacing to 100 feet would leave portions of the site outside the required coverage zone.
Option D: 10-A rating extinguisher every 150 feet
A 10-A rating far exceeds the minimum OSHA requirement of 2-A, and a 150-foot travel distance more than doubles the OSHA-mandated 75-foot maximum. Both values in this option are incorrect. Higher ratings and longer spacing do not represent OSHA's minimum compliance standard.
Memory Technique
Class A construction fires: 2-A rating, 75 feet. Remember '2 and 75' — two-A extinguisher, seventy-five foot reach. OSHA won't accept anything less.
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