What is the minimum rated single extinguisher for extra hazards?

The minimum rated single extinguisher for extra hazards is 40-B. This rating is indicative of the extinguisher's capacity to effectively combat fires that pose a higher risk due to the type of materials involved or the potential severity of the fire.

In contexts where extra hazards are present, such as industries or environments that involve flammable liquids or energized electrical equipment, it is essential to have extinguishers that can handle these risks. The 40-B rating refers to the performance level of the extinguisher, specifying that it can apply extinguishing agents over a defined area for a certain duration, which is crucial in effectively suppressing larger or more aggressive fires.

Understanding the distinction between the categories and ratings of fire extinguishers is vital for ensuring proper fire safety measures are in place. Ratings like A and B correspond to different types of fires, with A focusing on ordinary combustibles and B on flammable liquids. However, when dealing with extra hazards, the higher rating (in this case, 40-B) is necessary to meet safety standards and ensure adequate fire protection.