Thermal Imaging Done Right: Detecting Critical Electrical Faults Early. How?

In high-demand commercial and industrial environments, electrical systems rarely fail without warning, they deteriorate over time. The challenge is that these warning signs are often invisible until failure occurs. By then, businesses face costly downtime, safety risks, and potential asset damage. 

This is where electrical thermal imaging, when executed correctly, becomes a powerful diagnostic tool. It not only detects heat anomalies but also uncovers the underlying causes of electrical stress before they escalate into critical failures. 

Understanding What “Done Right” Really Means 

Thermal imaging is often misunderstood as simply identifying “hot spots.” Effective thermographic testing goes far beyond surface-level temperature readings. It requires interpreting thermal data in the context of equipment design, installation practices, and load conditions. 

A recent inspection highlighted this distinction clearly. An older contactor assembly was found operating at approximately 115°C, far exceeding typical operating expectations for such components. 

Why This Temperature Was a Red Flag 

Electrical components like contactors and terminals are generally designed to operate within temperature ranges aligned with insulation classes, often between 75°C and 90°C under load (depending on design and rating). Temperatures exceeding this range indicate abnormal operation and an increased risk of failure. 

At 115°C, the issue was not just a localised hot spot, it was a developing fault condition requiring immediate attention. 

Identifying the Root Causes 

Rather than stopping at the temperature reading, a professional thermographic assessment identified two key contributing factors: 

1. Ageing Equipment

Older contactors are more prone to internal wear and inefficiencies, including: 

• Increased electrical resistance due to worn contacts 

• Degradation of insulation materials 

• Reduced efficiency in current transfer 

2. Poor Installation and Limited Spacing

The contactors were installed with minimal spacing, leading to: 

• Heat stacking between adjacent components 

• Restricted airflow and poor heat dissipation 

• Elevated ambient temperatures within the enclosure 

This combination created a compounding thermal effect, accelerating deterioration. 

The Real Risks of Ignoring Thermal Warnings 

Operating at elevated temperatures introduces serious operational and safety risks: 

• Insulation breakdown leading to faults or short circuits 

• Increased resistance causing further heat escalation (thermal runaway) 

• Potential arcing or fire hazards 
• Unexpected equipment failure and costly downtime 

These are not isolated risks; they can cascade across systems, impacting broader operations. 

The Role of Standards and Compliance 

Proper thermal management aligns with key principles outlined in AS/NZS 3000:2018, including: 

• Preventing dangerous heat build-up within installations 

• Ensuring equipment is not adversely affected by environmental factors 
• Maintaining proper workmanship, including spacing and layout 

Thermal imaging supports compliance by identifying areas where installations may not meet these expectations. 

From Detection to Action

The value of thermal imaging switchboardslies in enabling corrective action before failure occurs. In this scenario, recommended steps included: 

• Replacing ageing contactors with suitable modern components 

• Redesigning the layout to improve spacing and airflow 
• Verifying load conditions and equipment suitability 

By addressing both the symptoms and root causes, businesses can prevent recurrence and improve long-term reliability. 

Why Professional Thermography Matters 

A trained electrical services provider or thermographer brings more than equipment; they bring insight. They understand: 

• Acceptable temperature ranges for different components 

• How installation design affects thermal behaviour 

• When heat indicates immediate risk versus gradual degradation 

• The appropriate corrective strategy 

Without this expertise, critical warning signs can be misinterpreted or overlooked entirely. 

Strengthening Business Continuity Through Early Detection 

For businesses, the benefits of accurate thermal imaging are clear: 

• Reduced risk of unplanned downtime 

• Improved electrical system reliability 

• Enhanced workplace safety 

• Lower maintenance and repair costs 
• Extended lifespan of critical assets 

It transforms maintenance from reactive to predictive, a key advantage in competitive industries. 

FAQs 

Choose Voltec’s Expert Solutions 

Detecting electrical faults early requires more than basic inspection; it demands technical expertise, standards knowledge, and precise interpretation. Voltec’s expert solutions deliver professional thermal imaging services designed to identify, diagnose, and resolve electrical risks before they escalate. 

From detailed reporting to actionable recommendations, Voltec ensures your electrical systems remain safe, efficient, and reliable. 

Choose Voltec’s expert solutions to uncover hidden risks and protect your operations with expert thermal imaging.