If you have multiple valves on a station an increase in wire size may be required because of _______.

• A. An increase in Pressure
• B. A decrease in pressure
• C. An increase in volts
• D. An increase in amps

Answer: (D)

When multiple valves are on one station, the electrical load goes up because each valve coil draws current when energized. To deliver enough current without causing the wire to overheat or the voltage to drop too much along the run, you use a larger wire size. Bigger conductors have higher ampacity and lower resistance, which helps maintain voltage at the valves and protects the wiring from overheating.

Pressure changes don’t directly drive wire sizing here—pressure is a hydraulic parameter, not an electrical one. A change in volts isn’t the typical reason either in this scenario; irrigation systems usually operate at a fixed low voltage, and the practical concern is the amount of current drawn. Therefore, the need for larger wire arises from an increase in amps.