Which of the following is NOT a major component of an electric elevator system?

In an electric elevator system, the key components typically include the hoistway, counterweight, and control system. The hoistway is the vertical shaft that houses the elevator car and its mechanisms, allowing it to move up and down. The counterweight is an essential part of the system that balances the weight of the elevator car, reducing the amount of energy required to move it and improving overall efficiency. The control system manages the operations of the elevator, including the user interface, safety mechanisms, and the sequencing of stops.

On the other hand, a light switch is generally not considered a major component of the elevator system itself. While lighting within the elevator and in the hoistway is important for safety and visibility, the light switch's role is auxiliary and not fundamental to the core operations of the elevator mechanism. Therefore, identifying the light switch as not being a major component aligns with the understanding of the essential elements that make up an electric elevator system.