Use a project-specific installation checklist to organise survey, foundation, mounting, wiring, testing and handover. Assign responsibilities, record results and resolve nonconformities before acceptance. Follow the approved design, equipment instructions and safe-work arrangements. A checklist supports consistent execution but does not itself guarantee freedom from failures, revisits or warranty disputes.
Common installation mistakes
| Mistake | How to prevent it |
|---|---|
| Reverse polarity on DC heads | Before energizing, have a qualified technician perform the prescribed inspections and electrical tests using appropriate instruments and safe isolation procedures; a multimeter check alone does not establish commissioning readiness. |
| Undersized cable causing voltage drop | Use the engineering schedule, not the cheapest cable |
| Missing surge protection | Specify the required monitoring functions with the cabinet; assess any retrofit separately |
| Earth resistance too high | Have a qualified electrical professional assess the earthing system and approved design before changing electrode depth or adding electrodes, then verify the completed installation by the required tests. |
| Unlabelled conductors | Label at both ends as you terminate, not at the end |
| Skipped insulation test | Make it a gate: no insulation test, no commissioning |
| Wrong torque on terminals | Use a torque wrench, not a regular spanner |
| Loading the foundation before the approved curing and strength requirements are met | Respect the curing time, even under deadline pressure |
1. Why a checklist matters
A structured installation checklist helps prevent missed tasks, record evidence and organise handover. Include protective bonding, cable identification, configuration checks and the required inspections and tests. Start from a consistent checklist format, then adapt it to the equipment, site, authority requirements and approved safe-work and traffic-management procedures. Assign responsibility for each item and record acceptance and corrective action. A checklist supports competent work; it does not itself guarantee compliance or prevent every safety incident.
2. Pre-arrival: site survey and drawing review
Before anyone goes on site, the office team completes the following: read the project specification and confirm the scope; review the intersection layout, pole positions and signal head schedule; read the wiring diagram and confirm terminal numbers; confirm the foundation drawings match the soil report; confirm the controller output count matches the signal head schedule; check the surge protection and earthing design; order long-lead items first (custom poles, special heads, large orders); pre-stage labelled cable, glands, terminals and consumables; confirm the site permits and traffic management plan; and brief the crew on safety, sequence and contingencies. A pre-arrival review helps identify and address potential site problems in advance.
3. Foundation, anchor bolts and cable duct
Foundation work should follow the approved structural and earthing drawings. Confirm the surveyed pole position, excavation depth, reinforcement, anchor-bolt template and projection, cable-duct route and earthing arrangement before pouring. Use the specified concrete and loading criteria; curing time alone does not establish readiness to load the pole. Photograph and record each foundation before backfilling. Obtain the required structural inspection and approval, and resolve nonconformities through the responsible engineer rather than improvising repairs.
4. Pole, signal arm and signal head mounting
After the foundation has been released for loading, install the pole, arms and signal heads according to the approved lifting plan and mounting drawings. Check alignment, verticality, cable routing, fasteners, visors, backplates and open drainage paths. Use the specified fastening procedure for the actual bolt grade, joint and surface condition; do not apply a generic torque or lubricant rule. Record installation checks and photographs in the handover package.
5. Cabinet placement, surge protection and earthing
The cabinet is the brain. Place it carefully: position the cabinet on the foundation pad or pole base; maintain the required clearance from the kerb, footpath and intersection sight lines; confirm the cabinet door swings clear and the locks work; bond the cabinet to the earth rod with the specified conductor size; install surge protection on the mains input and any external sensor cables; install the controller, conflict monitor, detector rack and power supply; label every conductor at both ends (the cabinet and the field device); and confirm the wiring diagram inside the cabinet door matches the actual wiring. A well-organised cabinet is a long-term cost saver. Spend time here.
6. Cable pulling, termination and labelling
Plan each cable run using the approved design. Select the required cable type and size for the route and environment, respect its minimum bend radius, and provide the service allowance specified by the design. Use compatible ferrules or lugs and the terminal manufacturer’s tightening torque. Label each conductor and verify its connection. Qualified personnel should perform continuity and insulation tests under the approved procedure, using the specified test voltage and acceptance criteria and isolating connected electronics where required by their instructions. Correct failed tests before energising.
7. Testing sequence
Before handover, qualified personnel should follow the approved inspection and commissioning plan. Record conductor termination and identification, continuity, insulation and protective bonding using the specified test methods and acceptance criteria. Verify the conflict monitor, detector inputs, each signal indication and the programmed sequence in the approved test environment. Where installed, test backup power, communication and clock synchronization. Isolate and investigate any failed check before authorization for operation; do not improvise live tests on an incomplete public-road system.
8. Handover, documentation and as-built drawings
Prepare a handover package appropriate to the installed equipment and contract: as-built wiring diagrams with recorded changes; applicable continuity, insulation, earthing and operating-sequence test results; the approved controller timing plan and configuration backup; equipment and serial-number lists; warranty documents and certificates; spare-parts lists and reorder contacts; and the agreed maintenance schedule. Include lamp, battery or camera tasks only where those items are installed. Agree the operations-team training scope and duration, and provide supplier, installer and authority contacts. Check the contract’s acceptance and warranty conditions rather than assuming the documents alone guarantee coverage.
Frequently asked questions
What is the most common installation mistake?
Unlabelled conductors and missing earth bonds. Both are easy to prevent but expensive to fix later. Label every conductor at both ends as you terminate it, and verify earth continuity before commissioning.
How long does a typical traffic light installation take?
The installation schedule depends on permits, site access, excavation, foundation design, concrete strength development, equipment availability and commissioning requirements. Do not mount a pole simply because a fixed number of days has passed; obtain the required foundation-strength and installation approval. Coordinate cabinet preparation and cable work with the approved construction programme.
Do I need a licensed electrician for traffic light installation?
Yes. Use personnel qualified for the actual electrical and traffic-control work, with any licences required by local rules. Confirm the supply voltage, isolation procedure and approved wiring design; a traffic-signal system may contain mains-voltage and low-voltage circuits. Cabinet termination, any conflict-monitor configuration and final commissioning require the relevant specialist competence and authority-approved procedures.
What tests must pass before commissioning?
Separate pre-energisation checks from controlled commissioning tests. Qualified personnel should complete the specified visual, wiring, protective-earth and electrical checks before applying power. Then perform the approved conflict-monitor, detector, lamp, sequence, backup-power and communication tests under controlled conditions. Resolve failures before releasing the system for operation.
Who owns the as-built drawings?
The contractor typically prepares the as-built drawings and hands them to the authority at project close-out. The authority stores them as the legal record of the installation. GAOQIAO recommends keeping a digital copy with the supplier as well.
How do I handle a project that has changed in the field?
Mark the change on the working drawing immediately (red pen), then transfer to a clean digital copy as soon as the change is verified. Do not energise until the as-built drawing reflects the change. The authority and the supplier both need the final as-built for warranty and maintenance.
What spare parts should I keep on site?
Prepare a spare-parts list for the installed models and maintenance response plan. Consider compatible LED modules, correctly rated controller fuses, surge protection modules, door seals, lenses and visors. Set quantities from equipment population, criticality, replenishment lead times and storage life rather than scaling a fixed allowance mechanically.
Relevant GAOQIAO products
These public GAOQIAO catalogue pages are related to the guide. Open them for the representative description, then confirm the latest installation procedure before ordering.
- Traffic signal controllersWired and solar controllers with cabinet and installation accessories.
- 300 mm (12 inch) LED traffic lightsFor urban-intersection signal heads, confirm the complete installation-hardware list in the order.
- Vertical signal polesVertical poles: confirm height and suitability for pedestrian or side-road installations
- Signal arm polesSignal-arm poles for vehicle approaches, subject to the approved structural design