Caldwell Industries was founded in Sheffield in 1991 by a working electrical engineer who believed that the person who runs the test should be the person who signs the report. That principle has not changed. Neither has the ownership.
In 1991, Robert Caldwell left a senior engineering role at a regional grid operator and set up a one-man testing business from a unit on Forgemasters Industrial Estate in Sheffield. His first client was a steel rolling mill three miles away. That client is still with us today.
The business grew because word spread the same way it always does in heavy industry — one maintenance manager told another. By 2001 we had 12 engineers and our first long-term maintenance contracts. By 2010 we had expanded into renewables commissioning and control panel manufacture. We have never taken outside investment, never sold a division, and never changed what we are.
Today Caldwell Industries employs 48 engineers directly, operates from two facilities in Sheffield and Glasgow, and holds five active accreditations. The ownership has not changed. The principle has not changed. The person who runs the test signs the report.
These are the four senior engineers who lead every major engagement. Average tenure: 14 years. When you call Caldwell, one of these four is the first person you speak to.
34 years in electrical testing. Started the business and still runs test programmes on major client sites. Specialises in HV diagnostics and grid asset condition assessment.
18 years with Caldwell. Leads all thermal imaging and arc flash analysis programmes. Qualified NFPA 70E arc flash assessor. Trains all junior engineers in safe isolation procedure.
Joined in 2010 to launch the renewables division. Has commissioned over 240MW of wind and solar capacity across the UK. Leads all G99 protection relay testing programmes.
Controls and automation specialist with 12 years at Caldwell. Leads all PLC, SCADA, and HMI projects. Siemens TIA Portal and Allen-Bradley certified. Based at Glasgow facility.
All Caldwell instrumentation calibrated and traceable to national measurement standards. Test results are legally defensible in any regulatory or insurance context.
All installation work and periodic inspection reports issued to the current 18th Edition standard. Every EICR signed by a qualified supervisor with current registration.
Technical competence and business standards independently assessed by NICEIC each year. Not self-declared — independently verified by the UK's leading electrical contractor scheme.
International standard for HV testing equipment and procedures. Required for transmission-level work and any contract with a grid operator or DNO.
Control panel design and manufacture certified to UL 508A. Required for North American market access and multinational clients operating across jurisdictions.
The scoping call is 30 minutes. You speak directly with one of the four senior engineers above — not a sales team. Fixed quote within 24 hours. No obligation until you sign.