What equipment might be found in secondary levels located under the machine room?

In secondary levels located under the machine room, you would typically find essential components related to the safety and operation of the elevator system, such as circuit breakers, governors, and deflector sheaves.

Circuit breakers are crucial for protecting the electrical circuits in the elevator system from overloads and short circuits. They ensure the safe operation of the system by automatically interrupting the flow of electricity when anomalies are detected.

Governors play a vital role in regulating the speed of the elevator and ensuring it does not exceed certain limits. This is especially important for safety, as they can initiate a system shutdown if the elevator moves too quickly, preventing potential accidents.

Deflector sheaves help redirect cables in the elevator system, allowing for smooth operation and minimizing wear and tear on the components. They are key to maintaining alignment and function in the hoisting system.

While other options contain important components used in the elevator system, they are not typically located specifically in the secondary levels beneath the machine room. Thus, identifying circuit breakers, governors, and deflector sheaves highlights the primary safety and operational functions vital to the elevator system in those secondary levels.