Switchgear Thermal Inspection and Hotspot Detection for Data Centres Malaysia
Switchgear distributes and protects the electrical power required by servers, network systems, cooling equipment and other critical data-centre infrastructure.
Loose connections, overloaded circuits and deteriorating electrical components may create abnormal heat inside the switchgear before a circuit trips or visible damage appears.
Regular switchgear thermal inspection helps Malaysian data-centre maintenance teams locate developing hotspots and plan corrective work before an unexpected electrical failure occurs.
Why Does Switchgear Develop Hotspots?
Electrical current produces heat during normal operation. However, excessive or uneven heating may indicate an abnormal condition.
Common causes include:
Loose electrical connections
High contact resistance
Overloaded circuits
Unbalanced phase loads
Corroded terminals
Damaged circuit breakers
Deteriorated contacts
Incorrect cable termination
Loose busbar joints
Damaged insulation
Poor ventilation
Dust accumulation
Ageing components
A component may continue operating despite abnormal heating. This makes thermal inspection valuable for preventive maintenance.
Why Is Switchgear Inspection Critical in a Data Centre?
A switchgear problem can interrupt power to:
Server racks
Network equipment
UPS systems
Cooling systems
Security systems
Fire-protection systems
Monitoring equipment
Lighting and support facilities
Even when a UPS is available, an electrical fault at the wrong location may still affect data-centre operations.
Early hotspot detection allows maintenance teams to schedule investigation or repair under controlled conditions.
Where Should Technicians Inspect?
Circuit Breakers
Inspect:
Line-side connections
Load-side connections
Breaker body
Cable terminations
Adjacent breakers
Comparable phases
One breaker operating significantly hotter than similar breakers may indicate a loading, connection or internal-component problem.
Busbar Connections
Check accessible:
Busbar joints
Bolted connections
Phase connections
Neutral bars
Earth bars
Distribution points
Loose or deteriorated busbar joints may create high resistance and localised heat.
Cable Terminations
Inspect:
Cable lugs
Terminal blocks
Crimped connections
Insulation near the termination
Entry points
Comparable conductors
Look for thermal differences between phases and similar circuits.
Contactors and Relays
Repeated operation and contact wear may gradually increase resistance.
Check for:
Uneven temperature
Localised heating
Abnormal buzzing
Discolouration
Signs of arcing
Damaged surrounding insulation
Fuses and Fuse Holders
A loose fuse connection or deteriorated fuse holder may produce excessive heat.
Compare the temperature of similar fuse positions operating under comparable loads.
Neutral Connections
Neutral connections should not be overlooked.
Abnormal neutral heating may be related to:
Loose connections
High neutral current
Load imbalance
Harmonic currents
Damaged conductors
Further electrical investigation may be required to determine the cause.
Tools for Switchgear Inspection
Thermal Imaging Camera
A thermal imaging camera allows technicians to scan multiple electrical components and identify abnormal temperature patterns.
The Noyafa NF-522 Thermal Camera can support:
Data-centre switchgear inspection
Circuit-breaker hotspot detection
Distribution-board inspection
UPS terminal inspection
Transformer-connection checks
Cooling-system electrical inspection
Unlike a single-point infrared thermometer, a thermal camera displays the temperature distribution across a wider area.
Clamp Meter
A clamp meter helps qualified technicians check the current carried by each conductor.
Current measurement is important because a heavily loaded phase may naturally operate at a higher temperature.
Comparing thermal readings without considering electrical load can lead to incorrect conclusions.
Digital Multimeter
Depending on the maintenance procedure, a digital multimeter may be used to check:
Voltage
Resistance
Continuity
Frequency
Other electrical parameters supported by the instrument
The meter must have an appropriate measurement category and voltage rating for the electrical environment.
Insulation Resistance Tester
An insulation resistance tester helps assess the condition of cables and electrical insulation when the circuit is properly isolated.
Insulation testing must follow the manufacturer’s instructions and approved shutdown procedure. Sensitive electronic equipment should be disconnected where required.
Sound Level Meter
Unusual buzzing, humming or arcing sounds may indicate an electrical or mechanical concern.
A sound level meter provides a recorded noise value for comparison, although it does not identify the fault by itself.
How to Perform a Switchgear Thermal Inspection
Step 1: Follow Electrical Safety Procedures
Before beginning, confirm:
Technician authorisation
Equipment identification
Applicable risk assessment
Required personal protective equipment
Safe working distance
Panel-access restrictions
Emergency procedures
A thermal camera reduces the need for physical contact, but it does not remove electrical hazards.
Step 2: Review Previous Records
Check:
Previous thermal images
Past hotspot locations
Equipment loading
Recent repairs
Breaker-replacement history
Reported electrical problems
Alarm records
Changes to connected equipment
Historical information helps the technician focus on areas with repeated problems.
Step 3: Inspect Under Representative Load
Thermal inspection is more informative when the switchgear is carrying a normal or representative load.
Record the approximate load at the time of inspection whenever possible.
A lightly loaded circuit may not reveal the abnormal heat that appears during normal operation.
Step 4: Scan the Complete Panel
Start with a broad thermal scan before checking individual components.
Inspect systematically from:
Incoming supply
Main breaker
Busbars
Distribution breakers
Cable terminations
Neutral and earth connections
Outgoing circuits
A consistent inspection sequence reduces the chance of missing an important component.
Step 5: Compare Similar Components
Compare:
Phase to phase
Breaker to breaker
Fuse to fuse
Terminal to terminal
Similar circuits
Current image to previous image
The temperature difference between comparable components is often more useful than the temperature of one component viewed in isolation.
Step 6: Record Thermal and Visual Images
Each abnormal finding should include:
A clear thermal image
A corresponding visual image
Equipment identification
Hotspot location
Maximum observed temperature
Comparable-component temperature
Ambient condition
Operating load
Inspection date
Clear evidence makes repair planning and reinspection easier.
Step 7: Confirm the Possible Cause
Thermal imaging shows the location and pattern of heat, but additional checks may be needed.
These may include:
Current measurement
Voltage comparison
Load-balance assessment
Connection inspection during shutdown
Torque verification
Insulation testing
Component replacement
Review of ventilation conditions
Only trained and authorised personnel should perform these checks.
Thermal Camera Versus Infrared Thermometer
Switchgear inspection taskThermal cameraInfrared thermometerScan an entire panelSuitableSlowFind an unknown hotspotEasierDifficultCompare multiple phasesClear visual comparisonSeparate readings requiredSave a thermal patternYesUsually noCheck one known locationYesYesPrepare visual maintenance evidenceStrong advantageLimited
An infrared thermometer can support basic point measurement, but a thermal camera is generally more effective for comprehensive hotspot detection.
Common Switchgear Thermal-Inspection Mistakes
Inspecting Without Recording Load
Electrical temperature depends strongly on current. A thermal reading without load information may be difficult to interpret.
Treating Every Warm Component as Faulty
Some components normally operate warmer than others. Compare similar equipment before deciding that a fault exists.
Ignoring Small Connections
Small terminals, neutral connections and control components may also develop hotspots.
Misreading Reflected Heat
Shiny surfaces can reflect heat from nearby equipment or the technician. Adjust the viewing position to confirm whether the pattern is genuine.
Inspecting from Excessive Distance
A small hotspot may be difficult to measure accurately when the camera is too far from the target.
Failing to Repeat the Inspection
After corrective work, perform another thermal inspection under a comparable load to confirm that the abnormal condition has been resolved.
What Should Be Included in the Inspection Report?
A professional switchgear thermal report should record:
Data-centre location
Switchgear or panel identification
Inspection date and time
Technician’s name
Ambient temperature
Electrical load
Thermal image
Visual image
Hotspot temperature
Reference temperature
Temperature difference
Possible cause
Recommended action
Repair priority
Reinspection date
How Often Should Switchgear Be Thermally Inspected?
Inspection frequency depends on:
Equipment criticality
Electrical load
Installation age
Previous hotspot findings
Manufacturer guidance
Site maintenance policy
Environmental conditions
History of electrical faults
High-load equipment and connections with previous abnormal readings may require more frequent inspection.
Detect Switchgear Problems Before They Interrupt Operations
Switchgear thermal inspection gives maintenance teams a practical way to detect abnormal heat while data-centre electrical systems remain in operation.
By combining a thermal imaging camera with load measurement, visual inspection and consistent reporting, technicians can identify developing problems in circuit breakers, busbars, cable terminations and electrical connections before they result in equipment damage or downtime.
Contact MTM Precision
MTM Precision Sdn. Bhd.
Showroom & Service Centre
No. 29-1 & 29-2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia
🌐 Website: www.mtmpre.com.my
📧 Email: mtmpre@yahoo.com
📱 WhatsApp: +6016-660 7346
01 Sep 2026
