Infrared Survey · Electrical Thermography
Infrared Electrical Inspections: What a Defensible Record Should Show
- Infrared electrical survey
- IR thermography inspection
- Infrared inspection report
Infrared inspection can identify thermal anomalies associated with electrical conditions such as loose connections, resistance problems, load imbalance, and overloaded conductors.
These conditions may produce abnormal heat before protective devices operate or equipment fails.
Two factors help determine whether the survey produces useful maintenance evidence.
The equipment needs to be operating under a representative load.
Infrared inspection is most useful when equipment is energized and carrying enough load for relevant heating patterns to appear. A scan taken under low-load conditions may not reveal a condition that becomes visible as current increases.
The operating condition at the time of the survey should be part of the inspection record so a reviewer can understand the context behind the thermal image and temperature data.
The inspection needs a meaningful reference.
Comparative thermography provides context that an isolated temperature reading may not provide. NFPA 70B addresses comparison between similar components under similar loading and comparison with appropriate reference conditions.
An absolute temperature can provide useful information, but temperature difference adds context. A reading becomes more useful when the record shows what it was compared against and the operating conditions present at the time.
That is why the report matters as much as the scan.
What a Strong Infrared Inspection Record Should Capture
A strong infrared inspection record should provide enough context for a qualified reviewer to understand what was inspected, what condition was observed, and what happened next. Depending on the maintenance program and applicable requirements, that record may include:
- Equipment and component identification
- Location
- Operating load or relevant operating condition
- Thermal image
- Measured temperature information
- Reference point or comparison
- Observed temperature difference
- Condition or severity assessment
- Date of inspection
- Person who performed the inspection
- Recommended action
- Follow-up status
A thermal image is evidence, but an image without equipment identification, operating context, reference comparison, and follow-up provides a weaker maintenance record. The value comes from connecting the image to the equipment, condition, location, operating state, and maintenance response.
How Often Should Infrared Surveys Be Performed?
Inspection frequency should follow the applicable maintenance program, equipment condition, manufacturer instructions, maintenance history, and governing requirements.
NFPA 70B, 2026 uses equipment condition as part of its maintenance framework. The applicable thermography method and maintenance frequency should be determined through the current published standard and the facility's electrical maintenance program.
FM Data Sheet 5-20 provides another example of insurer engineering guidance that addresses infrared surveys of electrical equipment within its scope.
NFPA 70B and FM guidance are not interchangeable. Each serves a different purpose, and site requirements may also be influenced by insurers, contracts, equipment manufacturers, authorities having jurisdiction, and internal maintenance procedures.
Why Consistent Records Matter
The value of infrared inspection increases when equipment can be compared across inspection cycles. A current report has more value when a reviewer can compare it with prior conditions, temperature differences, previous findings, and completed corrective work.
The evidence is only as good as the consistency of the capture that produced it.
FacilityOps AI helps standardize that record by connecting checkpoints, equipment identification, evidence, findings, timestamps, exceptions, and follow-up in one operating history.
The goal is not to replace infrared inspection or the qualified person performing it. The goal is to preserve the evidence in a form that supports maintenance review and future comparison.
Have a prior infrared inspection report available? See what a stronger inspection record can capture.
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Disclaimer / Source Note
This article describes NFPA 70B in paraphrase and does not reproduce the standard's text, tables, figures, threshold values, or maintenance interval values. It is not a substitute for NFPA 70B. Consult the current published edition and confirm the requirements that apply to your equipment, site, maintenance program, contracts, insurer requirements, and jurisdiction. FM Data Sheet 5-20 is referenced as an example of insurer engineering guidance. This article provides operational guidance only and is not legal advice.