What type of fire extinguisher is required in the power unit of a placarded vehicle?

The correct choice, which stipulates that a fire extinguisher with a U.L. rating of 10 B/C or above is required in the power unit of a placarded vehicle, aligns with the regulations set forth for hazardous materials transport. The B/C ratings indicate that the extinguisher is suitable for tackling fires caused by flammable liquids (B classification) and electrical fires (C classification), which are critical considerations for vehicles transporting hazardous materials.

This rating ensures that the extinguisher can effectively handle the types of fires that may arise from the hazardous cargo being transported, thereby enhancing safety measures for the operator and the surrounding environment. The requirement for a rating of 10 or higher reflects not only the size and capacity of the extinguisher but also the potential severity of risks associated with placarded vehicles.

In contrast, lower ratings such as 5 B/C would not meet the minimum safety standards needed for high-risk transport scenarios, and a rating of 15 ABC is above what is specifically required for this context, though it would provide a broader range of fire-fighting capabilities. Thus, a U.L. rating of 10 B/C serves as an adequate compromise between safety and practicality for managing fire risks during the operation of a plac