Electrical Thermography
Electrical thermography is a non-intrusive, non-destructive diagnostic technique using infrared thermal imaging cameras to detect abnormal temperature patterns and hot spots in energized electrical distribution systems. It identifies deteriorating, overloaded, or high-resistance components before catastrophic failure, enabling predictive maintenance and reducing fire risks.
In shop floor maintenance, electrical thermography is applied to energized equipment under normal load to scan panels, busbars, transformers, and connections. Technicians locate hot spots, determine problem severity, and establish repair timelines without interrupting operations. Both thermal and visual images are captured for trend analysis and baseline comparison. As of 2026, it is a mandatory requirement under updated NFPA 70B for Electrical Maintenance Programs, with inspections required at least once every 12 months. Often performed with covers removed (where risk-assessed) to expose terminations and busbars, improving diagnostic accuracy.
What emissivity settings are critical for accurate electrical thermography?
Correct emissivity settings (typically 0.9–0.95 for painted/oxidized metals) must be recorded alongside reflected temperature and load conditions to avoid false temperature readings.
Can thermography replace Electrical Installation Condition Reports (EICRs)?
No; it complements but does not replace traditional testing methods like EICRs, as it only detects thermal anomalies and cannot verify electrical continuity or insulation resistance values.
What load condition is required for valid surveys?
Surveys must be conducted under normal load conditions (typically >40% load) to ensure meaningful thermal signatures; low-load inspections may miss latent faults.