On a school bus, a fire extinguisher shall not have an aggregated rating of less than ____________.

A school bus must be equipped with a fire extinguisher that has an aggregated rating of no less than 8 B.C. This rating indicates the fire extinguisher's effectiveness against specific types of fires, particularly those involving flammable liquids and electrical equipment, which are relevant risks in a school bus setting.

Having a minimum rating of 8 B.C. ensures that the extinguishing agent can adequately suppress small fires that may occur on or near the bus, providing an essential safety mechanism for the driver and students. This requirement is established to enhance safety protocols in school transportation, ensuring that drivers can respond effectively in the event of a fire emergency. Consequently, ensuring that the fire extinguisher meets or exceeds this rating is a crucial part of the safety equipment mandated for school buses.