How to Find Electrical Hot Spots with a Thermal Camera: Noyafa NF-522 Malaysia
How to Find Electrical Hot Spots with a Thermal Camera: Noyafa NF-522 Malaysia
Electrical hot spots can develop around connections, circuit breakers, terminals, cables and other components when operating conditions cause abnormal heating.
Finding these areas early can help maintenance teams decide where further electrical inspection is required.
A thermal imaging camera is particularly useful because it allows technicians to scan multiple components at once rather than measuring every point individually.
The Noyafa NF-522 Thermal Imaging Camera, featuring 200 × 150 infrared resolution, 65mK thermal sensitivity and a -40°C to 330°C temperature measurement range, provides a practical tool for locating unusual thermal patterns during electrical inspections.
What Is an Electrical Hot Spot?
An electrical hot spot is a localized area that operates at a higher temperature than expected or compared with similar components under comparable conditions.
Possible contributing factors can include:
High-resistance connections
Loose connections
Corrosion
Excessive electrical load
Poor contact
Uneven phase loading
Deteriorating components
Thermal imaging can show the temperature difference.
It cannot automatically determine which of these conditions is responsible.
Where Are Electrical Hot Spots Commonly Found?
During electrical maintenance, technicians may inspect areas such as:
Distribution boards
Circuit breakers
Cable terminals
Busbar connections
Contactors
Relays
Fuses
Switchgear
Motor control centres
Electrical cabinets
Motor terminal boxes
The exact inspection procedure depends on the equipment and applicable safety requirements.
Step 1: Follow Electrical Safety Procedures
Thermal imaging is non-contact, but electrical inspection can still involve serious hazards.
Before inspection, follow appropriate requirements for:
Qualified personnel
PPE
Safe working distances
Energized equipment
Panel access
Site procedures
Equipment manufacturer instructions
Never compromise electrical safety to obtain a closer thermal image.
Step 2: Understand the Operating Load
Electrical temperature depends heavily on load.
A heavily loaded circuit may naturally operate warmer than a lightly loaded circuit.
Therefore, before comparing components, consider:
Current load
Equipment operating condition
Duration of operation
Ambient temperature
Thermal comparisons are most meaningful when operating conditions are understood.
Step 3: Scan the Overall Panel
Start with a broader thermal scan.
Instead of immediately focusing on one terminal, look at the complete accessible area.
The NF-522's 200 × 150 thermal detector provides approximately 30,000 thermal pixels, allowing the user to visualize temperature distribution across multiple components.
Look for obvious differences.
Step 4: Compare Similar Components
Comparison is one of the most effective thermal-inspection techniques.
For example, compare:
Breaker 1 vs Breaker 2 vs Breaker 3
or:
Phase L1 vs Phase L2 vs Phase L3
If comparable components operate under similar conditions but one is significantly hotter, that component deserves further investigation.
Step 5: Check Actual Temperature Values
Do not rely only on thermal-image colours.
A red component is not automatically dangerous.
Thermal colours depend on the displayed temperature scale and palette.
Instead, evaluate:
Actual temperature
Temperature difference
Load
Component type
Surface material
Ambient conditions
The temperature relationship is often more useful than colour alone.
Step 6: Consider Emissivity
Different surfaces emit infrared radiation differently.
The NF-522 provides adjustable emissivity from:
0.1 to 1.0
This is important because electrical equipment can contain:
Plastic
Painted surfaces
Copper
Aluminium
Cable insulation
Bare metal
Incorrect emissivity assumptions can affect temperature readings.
Step 7: Watch for Reflections
Shiny metallic components can reflect infrared energy from surrounding objects.
A thermal image may therefore show reflected heat rather than the true surface temperature.
Potential reflections can come from:
The technician
Nearby equipment
Hot machinery
Walls
Lighting
Other heat sources
Changing the viewing angle can sometimes help identify a reflection.
Step 8: Identify the Thermal Anomaly
Suppose a three-phase connection shows:
L1: 44°C
L2: 46°C
L3: 73°C
L3 clearly differs from the other phases.
The correct conclusion is:
“L3 shows an abnormal thermal condition requiring further investigation.”
Do not immediately conclude:
“L3 is definitely loose.”
Further testing is needed.
Step 9: Measure Electrical Current
A thermal camera measures temperature patterns, not electrical current.
If abnormal heating is discovered, a clamp meter may be used where appropriate to measure load.
For example:
NF-522 → Detect Hot Cable
Clamp Meter → Check Current
This helps determine whether the heating may be related to loading or whether another condition requires investigation.
Step 10: Perform Additional Electrical Testing
Depending on the situation, technicians may need other electrical measurements.
The exact tests depend on the suspected problem and equipment.
A useful principle is:
Thermal Imaging Finds the Symptom
Electrical Testing Helps Find the Cause
This is why thermal imaging works best as part of a broader electrical maintenance toolkit.
Step 11: Take Corrective Action
Once the cause has been properly identified, qualified personnel can perform the appropriate corrective action.
Examples may include maintenance, repair or component replacement according to applicable procedures.
The thermal camera itself does not determine what repair should be performed.
Step 12: Recheck After Maintenance
After corrective work and once the equipment is safely returned to suitable operating conditions, perform another thermal scan.
Compare:
Before Repair → After Repair
If the abnormal thermal pattern has disappeared or changed as expected, this provides useful verification information.
Example: Circuit Breaker Inspection
Imagine six similar breakers operating under comparable conditions.
Five breakers show temperatures around:
40–45°C
One breaker shows:
68°C
The 68°C breaker deserves attention.
Possible next steps include:
Check load.
Compare current.
Inspect connections.
Examine component condition.
Perform additional electrical tests if required.
The thermal camera helps prioritize the inspection.
Example: Cable Terminal Inspection
Suppose one cable terminal appears significantly hotter than nearby terminals.
Potential reasons may include:
Higher load
Increased connection resistance
Surface differences
Environmental effects
Instead of guessing, use the thermal image as the starting point for further diagnosis.
Example: Motor Control Panel
A motor control panel may contain:
Breakers
Contactors
Relays
Terminals
Cables
The NF-522 allows the technician to scan multiple components quickly.
A hot contactor or terminal can then be investigated using appropriate electrical measurements.
Why Thermal Imaging Is Faster Than Spot Measurement
Without thermal imaging, a technician may need to measure many individual points.
For example:
Point 1 → Measure
Point 2 → Measure
Point 3 → Measure
Point 4 → Measure
With thermal imaging:
Scan Entire Area → Find Anomaly → Focus Measurement
This makes thermal cameras particularly useful for large electrical panels.
Thermal Camera vs Infrared Thermometer
An infrared thermometer works well when the technician already knows which point needs measurement.
A thermal camera is better suited to finding an unknown hot spot.
The difference can be summarized simply:
IR Thermometer: “How hot is this point?”
Thermal Camera: “Where is the hot point?”
For troubleshooting, that distinction is important.
Why 200 × 150 Resolution Helps
The NF-522 provides:
200 × 150 = approximately 30,000 thermal pixels
This allows technicians to distinguish temperature patterns across multiple electrical components.
For DB boards, switchboards and control panels, this provides considerably more visual information than a single spot measurement.
Why 65mK Thermal Sensitivity Matters
The NF-522 is specified with 65mK thermal sensitivity.
This helps distinguish relatively small temperature differences within the thermal scene.
Developing electrical conditions may not always produce dramatic heat immediately, so the ability to visualize smaller thermal differences can be useful during preventive maintenance.
Create an Electrical Thermal Inspection Route
Factories and facilities can incorporate thermal imaging into scheduled maintenance.
A typical route might include:
Main switchboard
Sub-distribution boards
Motor control centres
Production-machine panels
HVAC electrical panels
Critical power connections
Repeated inspection makes it easier to recognize changes over time.
Record Thermal Trends
A thermal inspection history can be valuable.
For example:
January: 43°C
March: 47°C
May: 55°C
July: 66°C
A developing trend can provide additional evidence that a component requires investigation.
The goal is not merely to take thermal pictures.
The goal is to use temperature information to support maintenance decisions.
Noyafa NF-522 Key Specifications
Important specifications include:
Infrared resolution: 200 × 150
Thermal pixels: Approximately 30,000
Temperature range: -40°C to 330°C
Thermal sensitivity: 65mK
Frame rate: 9Hz
Adjustable emissivity: 0.1–1.0
Display: 2.8-inch TFT
Battery: 5000mAh
Drop resistance: Up to 2 metres
Who Should Use the NF-522 for Electrical Inspection?
Potential users include:
Electricians
Electrical contractors
Factory maintenance teams
Facility managers
M&E contractors
Manufacturing plants
Hotel engineering teams
Commercial building maintenance teams
Preventive maintenance providers
Engineering service companies
A Better Electrical Troubleshooting Workflow
The NF-522 fits into a simple professional workflow:
SCAN → COMPARE → VERIFY → DIAGNOSE → CORRECT → RECHECK
This is much better than treating every red thermal area as a confirmed fault.
Thermal imaging helps locate abnormal heat.
Electrical testing and professional judgment determine what that heat actually means.
Looking for an Electrical Thermal Camera in Malaysia?
MTM Precision supplies thermal imaging and electrical testing instruments for factories, contractors, facility management companies and industrial maintenance teams in Malaysia.
For electrical troubleshooting, the NF-522 can be combined with clamp meters, multimeters and other electrical instruments to create a more complete diagnostic solution.
Contact MTM Precision for the Noyafa NF-522 Thermal Imaging Camera, availability, quotation and application advice.
Contact MTM Precision
MTM Precision Sdn Bhd
No. 29-1 & 29-2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia.
Website: www.mtmpre.com.my
WhatsApp: +6016-660 7346
Email: mtmpre@yahoo.com
25 Aug 2026
