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- Certified Irrigation Technician Electrical Systems and Wiring Flashcards

6 cards from real CIT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. An irrigation technician measures 28 VAC at the controller's zone terminal but only 18 VAC at the solenoid in the field. What is the most likely cause?

    Answer: Excessive voltage drop due to long wire runs or undersized wire

    A 10 VAC drop between the controller and the field solenoid indicates excessive voltage drop in the field wiring. This is typically caused by wire runs that are too long for the gauge of wire used, poor splice connections, or corroded wire.

  2. What is the standard operating voltage for residential and commercial irrigation solenoid valves in North America?

    Answer: 24 VAC

    Standard irrigation solenoid valves operate on 24 VAC (volts alternating current), supplied by a transformer in the controller that steps down 120 VAC household power to 24 VAC. This low voltage is safe for direct burial wiring.

  3. When using a multimeter to test an irrigation solenoid, a reading of OL (overload/infinity) on the ohms scale indicates:

    Answer: An open circuit — the solenoid coil is broken

    An OL or infinity reading on the resistance (ohms) scale means there is no electrical path through the solenoid coil — it has an open circuit. The coil wire inside the solenoid has broken, and the solenoid must be replaced.

  4. The common wire (often white) in an irrigation system serves what purpose?

    Answer: It provides the return path for electrical current from all solenoids back to the controller

    The common wire provides the return electrical path from all solenoid valves back to the controller. It is shared by all zones, while each zone has its own individual wire from the controller to its solenoid.

  5. What type of wire splice connection is recommended for direct burial irrigation applications?

    Answer: Waterproof grease-filled wire connectors (gel-filled)

    Waterproof grease-filled (gel-filled) wire connectors are the standard for direct burial irrigation splices. The dielectric grease seals out moisture and prevents corrosion, ensuring reliable long-term connections in wet soil conditions.

  6. A technician is wiring a new controller and notices the transformer has two primary voltage taps: 120V and 240V. The building has 240V service only at the controller location. What should the technician do?

    Answer: Connect the primary wires to the 240V tap to match the building's supply voltage

    Multi-tap transformers are designed to accept different input voltages while producing the same 24 VAC output. The technician should connect the building's 240V supply to the 240V primary tap, which will produce the correct 24 VAC secondary output for the solenoids.