Thermal imaging records surface-temperature patterns that can help identify electrical components needing investigation. It is useful for maintenance planning, particularly when a board is operating under representative load. A thermal image is evidence to interpret—not a complete diagnosis or a guarantee that the installation has no faults.
For documented findings and prioritised maintenance recommendations, explore GMB’s commercial switchboard thermal imaging service.
What temperature patterns can tell you
An unusually hot connection or component may be associated with a poor connection, load issue or deteriorating equipment. Comparing similar components under comparable conditions can help identify anomalies that would not be apparent from an ordinary external view.
Temperature alone does not establish the exact cause. The electrician considers the equipment, load, surroundings and other observations before recommending further checks or repair. A finding may need electrical measurements or an isolated inspection to confirm what is happening.
Why timing and access influence the scan
A lightly loaded installation may not reveal a problem that becomes apparent during normal production. Explain your operating cycles so the scan can be planned for useful conditions. A warehouse scanned while major plant is off may provide a limited picture of its normal electrical behaviour.
Safe access must be assessed by the contractor. Energised electrical equipment presents risks, and opening covers is not a customer preparation task. Some equipment may not be safely accessible in the proposed window, and that limitation needs to be recorded.
What a scan cannot establish
An infrared camera cannot see through every enclosure or verify the condition of every concealed connection. Thermal imaging does not measure RCD trip time, prove insulation integrity or establish the condition of every plug-in appliance. Those require different assessments.
A report without significant anomalies means no such anomalies were identified within the scan’s scope and conditions. It is not a certificate of permanent electrical safety. Conditions can change with load, deterioration or subsequent work.
Turn the report into a maintenance plan
Useful reports identify locations, include thermal and reference images where appropriate, describe relevant conditions and prioritise recommended actions. Ask how urgent findings will be communicated rather than waiting for a routine report if a serious hazard is identified.
Agree who approves remedial work, what shutdowns may be required and whether follow-up checks are recommended. Where repeat scans are useful, comparable operating conditions improve their value. The scan and any repair should remain separately traceable so a recommendation is not mistaken for completed rectification.
- Share load cycles, board locations and access constraints.
- Record limitations where equipment cannot be assessed.
- Assign responsibility for acting on each finding.
- Keep evidence of rectification with the original report.