Hidden Switchboard Hotspot: A Sydney Thermal Imaging Case Study
This is a case study from a Sydney site. To book thermal imaging Sydney for switchboards and plant, see our main service page.
A routine look at a distribution board rarely tells the full story. To the eye, everything can look tidy, labelled, and “fine”. Under thermal imaging in Sydney, that same board can tell a very different story — one measured in degrees, not guesses.
On a recent inspection for a Sydney client, AGE Electrical Testing Services used electrical thermography on a Mechanical Services Distribution Board. What we found was invisible without infrared: a severe localised hotspot on a Hager EHN011 24-hour time switch, rated Priority 1.
What the eye can’t see — and the camera can
Thermal imaging (infrared electrical inspection) maps heat on live equipment while systems stay in service. Abnormal heat often points to loose terminations, high-resistance connections, overloaded circuits, or failing components — issues that visual checks alone can miss.
In this case, the thermogram highlighted a clear anomaly at the upper section of the time switch (marked Bx1 on the scan). Neighbouring components remained comparatively cool. The contrast is exactly why thermal imaging for electrical boards in Sydney is such a practical part of workplace electrical safety: it turns a silent fault into documented evidence.
The Priority 1 finding: numbers that matter
| Reading | Temperature |
|---|---|
| Fault temp (max) | 113.2°C |
| Reference temp (normal) | 37.9°C |
| Temperature difference | 75.3°C |
A 75.3°C differential is not a minor drift. It was classified as a Priority 1 thermal fault — immediate action required.
Localised overheating at the upper section of the Hager EHN011 time switch indicated a probable high-resistance connection, internal contact failure, or timer failure. Left unchecked, elevated temperature of this kind presents a real risk of equipment damage and fire.
Why this switchboard hotspot is an electrical fire prevention issue
Electrical fires and unexpected equipment failure rarely start with drama. They often start with heat building quietly at a connection or inside a component that still “looks normal” from the outside.
Electrical thermography helps facility and safety teams:
- Detect switchboard hotspots before failure
- Prioritise repairs with clear severity ratings
- Document risk for maintenance, insurance, and WHS due diligence
- Plan isolation and remediation without waiting for an outage or smoke
For Sydney workplaces that rely on mechanical services boards, control cabinets, and continuous plant, that early warning is the difference between a scheduled repair and an emergency shutdown.
What Priority 1 meant for remediation
The inspection report did not stop at a colourful image. It set out clear repair notes for urgent follow-up by a qualified electrician:
- Isolate the circuit where practical
- Arrange urgent inspection
- Verify load current and wiring configuration
- Inspect and re-terminate all associated connections
- Replace the time switch if there is evidence of overheating, loose terminations, or internal damage
That sequence is the point of professional thermography: find the fault, grade the risk, and give the site a practical path to make it safe.
What this Sydney case means for your site
If your switchboards only get a visual once-over, you may be missing the faults that matter most. A Priority 1 hotspot at 113.2°C on a small timing device is a reminder that “small” components can carry outsized risk when heat builds at a connection.
AGE Electrical Testing Services provides non-intrusive thermal imaging across Sydney and Australia-wide — scanning live switchboards and distribution equipment, capturing annotated thermal evidence, and delivering prioritised findings your electricians can act on. Many sites also combine thermography with test and tag in Sydney and RCD testing for broader electrical safety coverage in one visit.
Frequently asked questions
What is a Priority 1 thermal fault?
A Priority 1 rating means immediate action is required. In this Sydney example, a 75.3°C temperature rise above the reference reading on a time switch indicated a severe localised hotspot with risk of equipment damage and fire.
Can thermal imaging find faults without shutting power off?
Yes. Electrical thermography is typically performed on energised equipment under normal load, so operations can continue while infrared scanning identifies abnormal heat patterns.
Why wasn’t this hotspot visible without a camera?
Many connection and internal component faults generate heat without obvious external signs until late in the failure cycle. Infrared inspection makes that heat visible and measurable.
How often should Sydney workplaces schedule switchboard thermal imaging?
Frequency depends on load, environment, criticality of plant, and your maintenance strategy. High-use mechanical services boards and critical distribution equipment often benefit from regular thermographic inspection as part of preventative maintenance — ask us for a schedule suited to your site.
What do you receive after a thermal imaging inspection?
Clients receive a clear digital report with annotated thermal images, temperature readings, risk prioritisation, and recommended corrective actions — the same style of evidence shown in this case study.
Book thermal imaging in Sydney
Don’t wait for heat to become smoke. If you manage commercial, industrial, or multi-site facilities in Sydney and want switchboards checked with professional electrical thermography, contact AGE Electrical Testing Services on 1300 06 06 17 or hello@agetesting.au to arrange an inspection.
