Cable Insulation Resistance Megger Test Record

Inspection template for recording cable insulation resistance (IR) megger test results per cable, including test voltage, one-minute and ten-minute readings, polarization index, pass/fail status, and corrective actions.

Inspection Details

• Inspection date and time recorded
• Inspector name and qualification documented
  Record the technician or competent person performing the test and any relevant qualification or certification.
• Asset or work order reference recorded
  Enter the cable ID, circuit reference, panel designation, or work order number.
• Test location documented
  Record the site, building, area, or equipment lineup where the cable is installed.
• Cable identification and endpoints documented
  Identify the cable by tag number, size, type, and source-to-destination endpoints.
• Cable service status selected

Safety and Test Preconditions

• Lockout-tagout applied and verified
  Verify the circuit is isolated, de-energized, and controlled per OSHA 1910.147 before testing.
• Absence of voltage verified before megger test
  Confirm the cable is de-energized using an approved meter before applying insulation resistance test voltage.
• Required PPE worn
  Select all PPE used based on the hazard assessment and site requirements.
• Test area controlled and barricaded
  Confirm unauthorized personnel are excluded and the test area is marked as needed.
• Cable disconnected from sensitive equipment
  Ensure surge protection devices, electronic loads, drives, meters, PLCs, and other sensitive equipment are isolated before applying test voltage.

Test Equipment and Environmental Conditions

• Megger or insulation resistance tester identification recorded
  Record manufacturer, model, and asset or calibration ID.
• Test instrument calibration in date
  Verify the instrument calibration label or certificate is current.
• Test leads and accessories inspected
  Check leads, clips, and probes for damage, contamination, or exposed conductors.
• Ambient temperature recorded
  Record the ambient temperature at the test location.
• Relative humidity recorded
  Record the relative humidity at the test location.

Insulation Resistance Test Results

• Test voltage recorded
  Record the applied DC test voltage used for the insulation resistance test.
• One-minute insulation resistance reading recorded
  Record the 1-minute insulation resistance reading in megohms.
• Ten-minute insulation resistance reading recorded
  Record the 10-minute insulation resistance reading in megohms when polarization index is measured.
• Polarization index calculated and recorded
  Record PI as the ratio of 10-minute IR to 1-minute IR when applicable.
• Test method and measurement points documented
  Describe the test configuration, such as conductor-to-conductor, conductor-to-ground, or phase-to-phase.
• Readings stabilized and repeatable
  Confirm the readings were stable enough to support the recorded result.

Acceptance, Deficiencies, and Closeout

• Pass/fail status selected
  Select the final result based on the applicable acceptance criteria or project specification.
• Acceptance criteria referenced
  Document the project specification, OEM requirement, or standard used to determine acceptance.
• Deficiencies or non-conformances documented
  Record any abnormal readings, damaged insulation, moisture intrusion, contamination, or other defects.
• Corrective action assigned
  Describe the corrective action, retest requirement, or escalation path if the cable failed.
• Inspector signature captured
  Signature of the person completing the inspection record.