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Here’s Part 3 of our Guide to CompEx.


If you missed part 1, you can read it here first.

And part 2 can be found here.


What are the minimum requirements for those taking the CompEx course?
Candidates are expected to be already experienced in areas such as testing and carrying out inspections on electrical installations and to hold the relevant NVQ Level 3 qualification.

What are the elements of the course?
CompEx’s description of the course is as follows:

“The course will develop the delegates competency in the selection, installation, inspection and maintenance of electrical apparatus in potentially explosive atmospheres.”

The training part of the course lasts for five days. This is followed by two days of assessment, comprising practical and theoretical tests.

There are 14 “knowledge and assessment” units, which are usually taken in pairs. For AES, the relevant pairs are EX12A and EX12B, which relate to design and project engineers working on electrical installations that are suitable for explosive working environments.

How long does the accreditation last for?
Five years – after this time candidates are required to complete a refresher course.

Who is behind the accreditation?
The training scheme is operated by JTL, a provider of accredited training courses for professionals who have already achieved qualifications in their field. JTL has UKAS accreditation to the International Standard ISO/IEC 17024.

JTL works in association with the Engineering Equipment and Material Users Association (EEMUA), and CompEx has the support of the Health and Safety Executive (HSE), which is the independent regulator for health and safety at work, as well as NICEIC, the UK’s leading voluntary regulatory organisation for the electrical contracting industry.

Licenced centres for CompEx testing can be found across the globe.

CompEx accreditation is fast becoming essential for electrical engineers working in potentially hazardous or explosive environments.

By ensuring that its staff are fully qualified and accredited, AES is protecting their health and safety, along with the employees of the companies we work with.

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01924 283 737

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