Introduction
A 4-aspect signal head can combine circular, arrow or other approved indications in several configurations. The required output channels and conductors depend on the actual modules and electrical design, not only the number of physical sections. Use the approved model-specific diagram to identify each indication, supply and permitted common connection. Do not assume six switched conductors for every 4-aspect head.
Conductor schedule
For a four-section signal with red, yellow and green circular indications plus a green arrow, determine the wiring from the approved circuit and selected equipment diagrams. Confirm separate outputs, common-conductor arrangements and protection before specifying conductor counts.
| Circuit function | Required verification |
|---|---|
| Red, yellow and green signal outputs | Identify each output conductor by its terminal assignment and the approved wiring drawing; do not assume a regional insulation-colour convention. |
| Common or return conductor | Confirm the circuit topology, supply type and designated common terminal before connecting. A common conductor is not automatically a protective-earth conductor. |
| Protective earthing | Identify and connect protective earthing according to the applicable electrical rules and approved equipment drawings. Do not substitute it for a signal output. |
| Verification before energising | A qualified person should verify terminal labels, continuity and protective measures with the circuit safely isolated, using the approved test procedure. |
Cable Gauge and Length
Select conductor size using the actual voltage, load current, route length, installation method, temperature and applicable electrical requirements. Check both current-carrying capacity and the permitted voltage drop at the equipment. Do not assign an AWG size solely from a generic distance range; have the project’s qualified electrical designer confirm the cable specification and protection.
Terminal Layout in the Head
Check the terminal arrangement, conductor functions and cable-entry position against the wiring diagram for the selected signal head. Use the specified cable gland and routing, and leave only the service allowance permitted by the installation instructions without obstructing components, sealing or drainage.
Frequently Asked Questions
Select cable construction, conductor count, cross-section and identification from the approved wiring design and installation rules. Confirm the available cable options with GAOQIAO. Do not assume that every signal head requires seven conductors or that one cable arrangement is suitable for all routes and switching configurations.
Use durable conductor identification at both ends that matches the approved terminal schedule. Confirm the marker type and any factory-labelled cable supply with GAOQIAO before ordering.
Conclusion
Determine conductor count and sizing from the actual four-section signal configuration, its approved wiring diagram, electrical loads and cable route. Confirm whether a common conductor is required and its function; do not infer the wiring from the number of sections alone. Provide the project wiring requirements for review.
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Relevant GAOQIAO products
These public GAOQIAO catalogue pages are related to the guide. Open them for the representative description, then confirm the latest drawing and configuration before ordering.
- Traffic signal controllersWired and solar controllers with 6, 22, 44 and 56 output options.
- LED traffic signal heads200mm, 300mm and 400mm signal heads; confirm the selected model and applicable project requirements.
- Signal polesVertical, signal arm and double-arm poles; confirm suitability for the approved site design.
- Spare parts and accessoriesSpare LED modules, lenses, visors, surge arrestors and anchor bolts.
Related buyer resources
- Traffic Signal Controller Cabinet Guide
- Traffic Light Wiring Diagram Guide
- Traffic Light IP Ratings Guide
- Traffic Signal Head Specification Guide
- Solar Traffic Signal Site Survey
- Contact GAOQIAO
Submit the four-section signal configuration and wiring requirements
Related guides: controllers and wiring
Continue with these related resources for your traffic signal project.