What is the purpose of a common wire in an irrigation system?

The role of a common wire in an irrigation system is essential for the proper functioning of the system. This wire is used to complete the electrical circuit for all solenoid valves within the irrigation system. When the irrigation controller sends a signal to open a specific solenoid valve, the current flows through the common wire back to the controller, completing the circuit. This allows the valve to actuate and water to flow through the designated zone.

Without the common wire, the circuit wouldn't be complete, and the valves would not operate as intended. This aspect is crucial for a reliable irrigation setup, helping ensure that each section of the system can be independently controlled while still sharing a common return path for electrical flow.