What configuration is used when three elevators share the same hall call button riser?

In elevator control systems, a triplex configuration is used when three elevators share the same hall call button riser. This setup allows for efficient coordination among the elevators, enabling them to respond to hall calls and serve multiple floors effectively.

In a triplex system, the elevators can communicate with each other, optimizing their movements in response to passenger demand, which helps in reducing wait times and improving overall efficiency. This configuration is particularly useful in buildings where space is limited, and a centralized control over multiple elevators is required.

The zoning configuration refers to the division of elevator service into specific areas, which is not applicable here since all three elevators are sharing the same riser rather than being designated for different zones. A walking beam is a mechanical mechanism used in some older elevator systems to distribute the load, and AC relays are components for controlling the electrical aspects of the system. These concepts do not specifically describe the arrangement of hall call buttons shared by three elevators.