When you’re responsible for a live data centre, “a bit warm” isn’t a minor issue — it’s often the first visible symptom of resistance, overload, imbalance, or power quality stress that can snowball into trips, equipment damage, or downtime.
That’s why electrical thermography (infrared inspections) has become a core part of preventative maintenance for critical power environments — not just for finding hotspots, but for proving what was found, where it was found, how severe it is, and what action is recommended. And that’s exactly where SnapCor earns its place: turning thermal findings into clear, standardised, client-ready reports without the usual reporting bottleneck.
Quick summary: The “big 6” causes of overheating in data centres
These are the most common underlying reasons hotspots show up during data centre thermal imaging surveys:
- Loose / high-resistance connections (lugs, terminations, busbar joints)
- Overload & phase imbalance (new loads, uneven distribution, undersized components)
- Harmonics & neutral overheating (non-linear loads, UPS/IT power electronics)
- Degraded protective devices / switching gear (breakers, ATS/STS contacts, isolators)
- Environmental factors (dust, corrosion, moisture ingress, airflow effects)
- Installation / workmanship issues (torque errors, poor terminations, mismatched parts)
In the sections below, we’ll break down what each one looks like in the real world — and how to capture and document it properly using SnapCor’s instant on-site reporting workflow.
Why overheating happens (and why data centres are especially exposed)
Electrical heat is usually a sign of one (or more) of these conditions:
- Higher current than intended (overload)
- Higher resistance than intended (loose/oxidised connection, failing contact)
- Distorted current waveforms (harmonics)
- Uneven load distribution (phase imbalance)
Data centres amplify all of this because they’re high-density, high-uptime environments where loads shift often (new racks, rebalancing, expansion, maintenance changes). Regular IR inspections help identify hotspots early — and standards like NFPA guidance are widely referenced for periodic thermographic surveys.
1) Loose connections and high-resistance joints (the #1 culprit)
Loose electrical connections are consistently one of the most common causes of overheating in panels and power distribution. Vibration, thermal cycling, and minor mechanical movement can slowly reduce contact integrity — increasing resistance and creating a local hotspot.
Where it shows up in data centres
Look closely at:
- Switchgear and distribution board cable lugs
- Busbar joints and link connections
- Breaker terminations and outgoing feeders
- PDU/RPP input/output terminations
- UPS input/output connections
What it looks like on a thermogram
- A tight, localised hotspot at a termination point
- Often one phase is significantly hotter than the others
- The component body may be cooler than the connection point.
How SnapCor documents it clearly
With SnapCor, engineers can attach thermal + visual images and log the issue using consistent fields (asset, location, load, measured temp, delta-T, severity grade, recommended action). SnapCor is designed to automate load correction, grading, and layout so the report remains consistent across engineers and sites.
If your organisation also runs inspection services, this aligns with the inspection expectations outlined in TI Thermal Imaging’s electrical inspection approach — where each asset gets its own page with thermogram + digital image, ambient/measured/delta-T, and trending.
2) Overload and phase imbalance (quiet stress that becomes “normal”)
Data centres rarely fail because something suddenly became overloaded — they fail because overload became the baseline, and heat kept accumulating at the weakest point.
Common data centre triggers
- Additional rack load added without full rebalancing
- Temporary load shifts during maintenance
- One leg consistently carrying more load than others
- Undersized conductors/components for current duty
What to look for
- Overall elevated temperature across a device (breaker, busbar section)
- One phase consistently hotter than the other two (imbalance)
- Heat patterns that correlate with peak utilisation periods
Why it matters
Overload and imbalance increase temperature, which accelerates insulation ageing and can contribute to future connection loosening — compounding risk.
How SnapCor helps
SnapCor is built for electrical thermography reporting, including load correction and fault grading, and can produce a professional PDF report rapidly — designed for field delivery rather than back-office write-ups.
3) Harmonics & neutral overheating (classic in “electronics-heavy” environments)
Data centres are full of non-linear loads — power supplies, UPS systems, VFDs and other electronics. These can generate harmonics that lead to unwanted heating in conductors, transformers, and especially neutrals.
- Eaton notes that current harmonics can cause unwanted current and overheating across multiple components (motors, cables, transformers, neutrals).
- Schneider explains how certain harmonic currents (notably 3rd) can add on the neutral rather than cancel out, increasing neutral current and heating risk.
Where it shows up
- Neutral bars / neutral conductors running unusually warm
- Transformers with elevated temperature beyond expectation
- Cable bundles where neutrals run hotter than phases
- UPS-related distribution, particularly downstream of certain load profiles
How to document it properly
A “good” report doesn’t just say “hot neutral.” It should capture:
- Location + equipment ID
- Thermal + visual images
- Load readings (where possible)
- Notes indicating suspected cause (harmonics / imbalance / connection)
SnapCor’s structured workflow and “drop-down” style consistent inputs (root causes, remedial actions, grading rules) help ensure these findings are recorded the same way across engineers and sites.
4) Degraded breakers, isolators, ATS/STS contacts and switching gear
Not all hotspots are “loose lugs.” Sometimes the heat is inside the device due to:
- Worn or pitted contacts
- Increased contact resistance over time
- Mechanical degradation
- Internal component fatigue
Typical data centre hotspots
- Breakers feeding critical loads that run warm under normal duty
- Transfer switches and isolators at contact points
- Panelboard components that show repeating temperature elevation cycle-to-cycle
Reporting best practice
For switching gear, clarity matters. A useful report highlights:
- The component type and function (critical feed vs non-critical)
- The observed thermal pattern (contact area vs cable termination)
- A priority-based recommended action (inspect/torque/replace as needed)
This is where SnapCor-style reporting becomes more than “nice formatting” — it becomes operationally useful because the finding is documented in a standard way that maintenance teams can act on quickly.
5) Environmental effects: dust, corrosion, moisture and airflow
In data centres, electrical rooms and plant areas can still be exposed to:
- Dust ingress (acts as insulation + can contribute to tracking)
- Corrosion/oxidation at terminations (increases resistance)
- Moisture risk in certain plant spaces
- Airflow patterns that distort surface temperature readings
Thermography findings must be interpreted with context — and the report should capture that context (ambient temperature, access conditions, panel state, and load). Inspection approaches that include ambient/measured/delta-T and trending are commonly used for this reason.
6) Installation / workmanship issues (the “it was like that from day one” category)
Some hotspots are present shortly after installation because of:
- Incorrect torque on lugs
- Poor crimping or termination method
- Mixed component ratings or mismatched parts
- Cable routing causing unexpected heating concentration
Thermography is especially valuable here because it can verify whether a new installation is behaving normally under load (or not) — before it becomes a service-affecting fault.
What a “data centre-ready” thermography record should include
If you want your report to be actionable for FM teams, compliance teams, and critical power stakeholders, each anomaly should be documented with:
- Asset ID + location (site, room, panel, way, feed)
- Thermal image + matching visual image
- Measured temperature + ambient + delta-T
- Load condition notes (if available)
- Severity grade (clear and consistent)
- Likely cause (connection, overload, harmonics, device degradation)
- Recommended action with priority and timeframe
- Trend reference (if it’s a repeat issue)
This is the reason organisations adopt tools like SnapCor and the broader TICOR reporting approach: faster reporting is great — but consistent, standardised reporting is what scales across sites and multiple engineers.
How SnapCor makes data centre thermography reporting faster and clearer
SnapCor is positioned as a reporting platform that turns thermal + visual images into professional PDF reports quickly, designed for use in the field.
In practice, that means:
- Engineers can deliver a client-ready report on-site, not days later
- Findings are standardised using consistent templates, grading rules, and wording
- Reports are structured for maintenance teams: clear fault pages + recommendations
- Training resources are available via SnapCor training and the SnapCor YouTube channel for faster onboarding across teams.
A practical checklist for your next data centre thermal imaging survey
Before you start:
- Confirm access, safety procedures, and panel opening permissions
- Plan routes: switchgear → UPS → PDUs/RPPs → critical panels → plant distribution
- Capture load context where possible (even “high/medium/low” helps)
During inspection, prioritise:
- Terminations and busbar joints
- Critical feeders
- Repeating assets with previous “warm” notes
- Neutral bars/cables (harmonic risk)
- Transfer equipment and switching gear
After inspection:
- Document findings immediately, while site context is fresh
- Share the report with clear priorities and recommended actions.
Final word: spotting hotspots is only half the job — proving them is the other half
In data centres, the most valuable thermography program is the one that produces repeatable evidence: what changed, what’s trending, what’s urgent, and what was fixed.
If your team wants to standardise how overheating issues are recorded and reported — and reduce the time between finding a fault and issuing the report — explore SnapCor’s reporting workflow.
Book a demo to see SnapCor on your real inspection workflow.
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