What does the station wire connect in an irrigation system?

In an irrigation system, the station wire plays a crucial role by connecting the controller to a specific valve. When a controller is programmed to operate a particular zone, the station wire sends electrical signals to the valve that controls the flow of water to that zone, enabling or disabling the water supply as instructed by the controller. This connection is essential for the automation of irrigation, ensuring that plants receive the correct amount of water at designated times.

The other functions mentioned in the options, while important in their respective roles in an irrigation system, do not pertain to the specific purpose of the station wire. For example, linking multiple controllers together would typically involve a different type of wiring or communication protocol, and sensors connect to controllers using separate wiring systems designed for data transfer rather than direct control over valves. The provision of power to a transformer also involves different wiring, specifically for power supply purposes and not for operational control of valves.