Traffic Signal Loop Splice and Megger Test Inspection

Field inspection template for documenting inductive traffic signal loop splice locations, home-run terminations, loop resistance, and insulation resistance to ground during installation and acceptance testing.

Inspection Details

• Project / site identifier
  Enter the project number, intersection name, or site identifier.
• Inspection date and time
  Document when the inspection and testing were performed.
• Inspector name and company
  Record the qualified inspector or competent person performing the test.
• Loop location / approach / lane designation
  Identify the specific lane, approach, or detector loop location being tested.
• Work order / permit / plan reference
  Reference the applicable work order, permit, plan sheet, or as-built drawing.
• Inspection type
  Select the inspection context for this record.

Safety and Test Preconditions

• Traffic control and work zone protection in place
  Confirm the work zone is protected per the approved traffic control plan.
• LOTO / circuit isolation confirmed before testing
  Verify the detector circuit is isolated and safe to test before using the megohmmeter.
• Test equipment calibrated and suitable for loop megger testing
  Confirm the megohmmeter or insulation resistance tester is in calibration and appropriate for the circuit.
• Circuit de-energized and disconnected from controller input
  Verify the loop circuit is disconnected from the controller or detector input before insulation testing.
• PPE appropriate for electrical and roadway work
  Confirm required PPE is being used, including eye protection and any arc-flash or roadway PPE required by the site conditions.
• Ambient conditions suitable for testing
  Confirm weather and site conditions allow safe and reliable testing.

Loop Wiring and Splice Verification

• Loop wire continuity from saw cut to home-run verified
  Verify the loop conductor path is continuous from the loop to the home-run termination.
• Splice locations recorded and accessible for review
  Confirm all splice locations are documented and can be identified on the record or as-built sketch.
• Number of splices in loop circuit
  Enter the total number of splices associated with this loop circuit.
• Home-run termination identified and labeled
  Verify the home-run termination point is identified, labeled, and traceable to the detector lead-in.
• Splice method and enclosure condition acceptable
  Select the splice method used and confirm the enclosure or seal condition.
• As-built sketch or photo set attached
  Attach photos or a marked-up sketch showing loop routing, splice points, and home-run path.

Electrical Test Results

• Loop resistance measured
  Record the measured loop resistance.
• Insulation resistance to ground measured
  Record the megohmmeter reading from the loop conductor to ground.
• Megger test voltage used
  Enter the test voltage applied during the insulation resistance test.
• Test duration / stabilization time
  Record the time allowed for the reading to stabilize before recording the result.
• Reading taken from loop to ground with other conductors isolated
  Confirm the measurement was taken with the correct conductor isolated and the other lead on ground.
• Pre-installation or baseline reading available
  Indicate whether a baseline reading was taken before installation or prior to repair.

Acceptance, Deficiencies, and Closeout

• Deficiencies or non-conformances observed
  Select any observed issues requiring correction.
• Corrective action required and assigned
  Indicate whether corrective action is needed to resolve any deficiency.
• Final acceptance status
  Select the final disposition of the loop circuit after inspection.
• Inspector signature
  Sign to certify the accuracy of the inspection record.