A loose connection inside an electrical panel doesn't announce itself until it trips a breaker or starts a fire — long before that, it's running hotter than everything around it. What thermography detects, and why point-and-shoot isn't enough.
A loose connection inside an electrical panel doesn’t
announce itself until it fails, trips a breaker, or starts a fire. Long
before any of that happens, it’s running hotter than everything around
it — and an infrared camera can see that heat from across the room
without anyone opening the panel.
Infrared thermography uses a camera sensitive to infrared radiation
to produce a thermal image showing temperature differences across a
surface, revealing heat patterns invisible to the naked eye. In
manufacturing, it’s used as a predictive maintenance technique
alongside vibration analysis and oil analysis — see our related guide
on oil
analysis and tribology for the second major predictive maintenance
technique it commonly complements.
| Application | What it reveals |
|---|---|
| Electrical | Loose connections, overloaded circuits, and failing components that run hotter than normal |
| Mechanical | Bearing overheating and friction heat from misalignment |
| Building envelope | Insulation gaps and moisture intrusion in roofs and walls |
NFPA 70B, the standard for electrical equipment maintenance,
recommends periodic infrared scanning of electrical panels and
connections as part of a preventive maintenance program, since thermal
anomalies are one of the earliest reliable warning signs of a
developing electrical failure — often visible weeks or months before
the connection actually fails.
An infrared image is only as accurate as the settings behind it.
Getting a reliable temperature reading requires accounting for the
target surface’s emissivity (how efficiently it radiates heat),
reflected ambient temperature, and distance from the camera — factors
that, if ignored, can produce a thermal image that looks dramatic but
reports a temperature that’s meaningfully wrong. Certified
thermographers, trained through programs with Level I, II, and III
designations similar in structure to NDT certification, learn to
account for these variables rather than treating the camera as a
point-and-shoot tool.
Infrared thermography fits inside the predictive maintenance work
covered in SCMEP’s Predictive
Maintenance Strategies training. As a
NIST Manufacturing Extension Partnership affiliate
serving South Carolina manufacturers since 1989, our focus is
helping teams add thermography to an existing maintenance program in a
way that’s actually acted on, not just an annual scan filed away.
If your team is building out a predictive maintenance program or
adding thermal scanning to electrical inspections, you can
browse the Maintenance and
Reliability training catalog or email the training team.
Infrared thermography uses a thermal camera to detect heat patterns invisible to the naked eye, commonly used as a predictive maintenance technique to catch loose electrical connections, overheating bearings, and misalignment before they fail.
NFPA 70B recommends periodic infrared scanning of electrical panels and connections as part of a preventive maintenance program, since thermal anomalies are often visible weeks or months before an electrical connection actually fails.
Accurate readings require accounting for the target surface’s emissivity, reflected ambient temperature, and distance from the camera. Ignoring these factors can produce a thermal image that looks dramatic but reports a meaningfully wrong temperature.
Thermography, vibration analysis, and oil analysis are the three major predictive maintenance techniques, each detecting different failure signatures — heat, vibration signature changes, and lubricant contamination — and are often used together.
