Thermal Imaging Surveys for Commercial Buildings: Find Electrical Faults Before They Cause Downtime

Tom Clewer • 25 October 2026

As the nights draw in and heating, lighting and machinery all work harder, your electrical system comes under more strain.

For businesses across Telford, Shropshire and the West Midlands, that is exactly when a loose connection or overloaded circuit is most likely to show itself, usually at the worst possible moment.

The frustrating part is that most of these faults give warning signs long before they fail. You just can't see them with the naked eye.

A thermal imaging survey lets our engineers see them, without switching anything off and without touching a single cable.

In this guide, we explain what an electrical thermal imaging survey involves, what it can find, who needs one and how it fits alongside your EICR (fixed wire testing).


What is an electrical thermal imaging survey?

A thermal imaging survey (sometimes called an infrared survey or thermography) uses a specialist infrared camera to show surface temperature differences across your electrical equipment. Healthy components run at a predictable temperature. A failing one runs hotter, because resistance is building up where it shouldn't.

On the camera, that shows up as a bright hotspot on an otherwise normal board. Our certified thermographers read these images, measure the temperature rise and tell you which faults need attention first.

It is a non-contact, non-invasive inspection, so your site can usually carry on operating while we work.


What can thermal imaging find?

Thermal imaging is brilliant at picking up developing problems that a standard visual check would miss, including:

  • Loose or deteriorating connections in distribution boards and switchgear
  • Overloaded circuits and unbalanced phases
  • Overheating breakers, fuses, contactors and isolators
  • Worn or failing motors and motor control equipment
  • Faulty connections on busbars and cable terminations
  • Hot spots in plant rooms, server rooms and comms cabinets

Left alone, these faults can lead to nuisance tripping, unplanned shutdowns, damaged equipment and, in the worst cases, electrical fires. Our earlier post on what causes electric to trip covers some of the everyday causes behind these problems.


How does a thermal imaging survey work?

Every site is different, but a typical survey follows these steps:

  1. Planning: We agree which boards, panels, switchgear and plant are in scope, and arrange access with your site or facilities manager.
  2. Scanning under load: Faults show up most clearly when equipment is working, so we carry out the survey while your building is operating normally.
  3. Safe access: Our engineers open panels where it is safe to do so and scan the equipment inside.
  4. Recording: Every hotspot is captured as a thermal image alongside a standard photograph and a temperature reading.
  5. Reporting: You receive a clear written report with the findings ranked by priority.

Because the survey is done on load and without shutting down, it is far less disruptive than most planned maintenance.


Thermal imaging vs an EICR: what's the difference?

This is a question we get asked a lot, and the two are often confused. They do different jobs, and they work best together.

  • An EICR is a formal inspection and test of your fixed electrical installation, carried out with the power off or isolated in sections. It checks whether the installation is safe and meets BS 7671, and it results in a condition report. Read more in What is Fixed Wire Testing? and What Does a 5-Year Electrical Test Involve?
  • A thermal imaging survey looks at how your equipment behaves while it is live and working. It spots heat-related faults that may be developing between formal tests.

A thermal survey does not replace an EICR, and an EICR will not always reveal a connection that is slowly heating up. Many of our commercial clients use both: the EICR to prove compliance, and thermal imaging to keep the system reliable in between.

If a survey does find a fault, our team can carry out the repair too. See our electrical remedial works service, or read What does remedial work mean?


Who needs a thermal imaging survey?

Thermal imaging is a smart investment for any business that cannot afford unplanned power problems. It is particularly valuable for:

  • Industrial units and factories with heavy machinery and high electrical loads
  • Warehouses and distribution centres running around the clock
  • Commercial property managers and landlords looking after multi-tenant buildings
  • Offices and retail premises with busy distribution boards
  • Server rooms and comms rooms where downtime is costly
  • Schools, care homes and public buildings where safety is critical

If your premises are ageing, have seen recent changes in use, or have been extended or reconfigured, a survey is a very good way to check that everything is coping.


How often should you have one?

There is no single legal interval for thermal imaging. Many businesses choose to carry out a survey once a year, and it often makes sense to:

  • Book it ahead of the colder months, when loads increase
  • Schedule it alongside your EICR or planned preventative maintenance
  • Repeat it after electrical remedial works or major changes to the installation
  • Do it more regularly for critical equipment, high-load areas or older installations

You can read more about planning ahead in our post on EICR frequency and preparing your electrical systems for winter.


The legal and insurance side

Thermal imaging isn't a standalone legal requirement, but it supports your wider duties. Under the Electricity at Work Regulations 1989, electrical systems must be maintained so as to prevent danger. Under the Regulatory Reform (Fire Safety) Order 2005, the person responsible for a commercial building must take steps to reduce the risk of fire. Finding and fixing an overheating connection is a practical way to do both.

Some insurers also look favourably on, or ask for, evidence of proactive electrical maintenance. It is always worth checking the requirements of your own policy, and a clear survey report gives you something solid to show.


What do you get in the report?

You will receive a detailed report that is easy to act on, not a page of jargon. It includes:

  • Thermal and standard images of every issue found
  • Temperature readings and the location of each fault
  • Findings prioritised by urgency
  • Clear recommendations for what needs repairing and when

That means you can plan and budget for repairs on your terms, instead of reacting to an emergency call-out.


Why choose Fixed Wire Telford?

We are a local team of specialist commercial electrical engineers, based at Kemberton Road in Telford and covering businesses across Shropshire and the West Midlands. When you book a survey with us, you get:

  • Certified thermographers using modern, high-resolution infrared equipment
  • Fully accredited contractors: we are NICEIC Approved, SafeContractor approved and SSIP accredited. You can see the full list on our accreditations page, or read what SafeContractor accreditation means for your business.
  • One team for everything: thermal imaging, EICRs, PAT testing, emergency lighting and remedial works, so there's no need to juggle contractors
  • Local knowledge and quick response across Telford, Shropshire and the West Midlands


Where we work

We provide thermal imaging surveys for commercial and industrial premises throughout Telford, including Wellington, Oakengates, Donnington, Madeley, Priorslee, Stafford Park and Hortonwood, as well as Shrewsbury, Newport, Shifnal, Bridgnorth, Wolverhampton and the wider West Midlands.


Frequently asked questions

Does thermal imaging mean we have to shut the power off?

No. Thermal imaging is carried out on live equipment under normal load, so your business can usually carry on as normal. Panel covers are only opened where it is safe to do so.


Is thermal imaging the same as an EICR?

No. An EICR is a formal test of your fixed electrical installation that results in a condition report. Thermal imaging is a live survey that finds heat-related faults. Many businesses have both.


How long does a thermal imaging survey take?

It depends on the size of your site and how much equipment is in scope. A small unit may take a short visit, while a larger industrial site may need longer. We can give you a clear idea when we discuss your premises.



Can thermal imaging find every electrical fault?

No. It is excellent at finding heat-related problems in equipment that is under load, but it cannot detect every type of fault. That is why it works best alongside regular fixed wire testing and good maintenance.


Do you cover my area?

We cover Telford, Shropshire and the West Midlands. If you are not sure, just give us a call.


Book a thermal imaging survey in Telford

Don't wait for an overheating connection to become an emergency. Find out what's happening inside your boards and panels, and fix problems on your own schedule.

Call Fixed Wire Telford on 01952 482886 or get in touch online to arrange your survey.



You can also read more about our thermal imaging services.

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