Traffic Signal Voltage Selection: 12V, 24V, 110V or 220V?
Match traffic signal voltage to controller output, cable length, solar design, backup power and local supply.
Project review
Map the power path from supply to controller, cable, signal head and backup arrangement. All interfaces must use compatible rated voltage.
Buyer checklist
- Controller output and switching
- Cable length and voltage drop
- Solar batteries and charge controllers
- Terminals, protection and labels
Confirm the approved power configuration before shipment to reduce site rework.
Review the 200mm configuration checklist or the 300mm configuration checklist, then confirm the quoted model's electrical rating and controller interface.
Build an electrical interface schedule
List the power supply, controller output and each connected signal model separately. For every interface, record the rated input, AC or DC designation, terminal labels and the relevant wiring drawing. Do not infer the signal-head rating from the cabinet supply voltage or from another product with the same diameter. The quoted model documentation must identify the required configuration.
Replacing existing signals
Send the existing product label, controller model and approved wiring information with the enquiry. State whether the order is for a complete head or a replacement module. Include countdown or auxiliary devices in the compatibility review because these may have separate power and control connections. Ask the supplier to identify any information that is still missing before confirming the order.
Review the complete power path
Have the project engineer review the cable route, conductor selection, protection arrangements and any battery or solar equipment against the actual design. These decisions cannot be made reliably from the words 12V, 24V, 110V or 220V alone. Keep the accepted wiring diagram and model references with the installation record. Electrical measurements, connection and commissioning should be performed by qualified personnel following the approved documentation, rather than by trial connection to an available supply.