Which type of buses are required to have spare electrical fuses?

Answer: B — Buses without circuit breakers

Buses that do not have circuit breakers are required to have spare electrical fuses. This is because fuses serve as protection devices that interrupt electrical circuits in case of overload or short circuits. When a fuse blows, the circuit is interrupted, and the bus loses electrical power until the fuse is replaced. Since buses without circuit breakers do not have an automatic reset function, it is essential to have spare fuses available on board to ensure the bus can be operational again without significant delays. This practice helps maintain safety and ensures that drivers can quickly address electrical issues that may arise during their route. Having spare fuses readily available becomes a critical component of the bus's maintenance and operational readiness.