Course info

CompEx certificate
5.0 Days
Who is it for
Electrical and industrial technicians working in potentially explosive atmospheres
No specific fitness requirements
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CompEx EX01 - EX04

The CompEx scheme, which includes Gas and Vapours EX01 - EX04, is a globally recognised qualification.

It is supported by the Health and Safety Executive (HSE), the National Inspection Council for Electrical Installation and Contracting (NICEIC) and the Engineering Equipment and Materials Users' Association (EEMUA). 

CompEx is the only Certification Body that offers UKAS accredited cerification for practicioners working in explosive atmospheres.

Find out more about CompEx at AIS Training >>

Course Overview

The CompEx course EX01 - EX04 involves competence based training and assessment for electrical and instrumentation technicians who are working in environments with the potential risk of explosive atmospheres.

Potentially explosive environments include onshore and offshore oil and gas installations and petrochemical plants.

The underpinning knowledge and practical assessment in a CompEx course is provided for electrotechnical personnel who understake the physical installation and assembly of new 'Ex' equipment and perform preventative maintenance and inspections on previously installed equipment.

AIS Training offer the full CompEx Gas and Vapours course including modules:

  • EX01: Preparation and installation of Ex 'd', 'n', 'e' and 'p' electrical equipment in explosive atmospheres
  • EX02: Inspection and maintenance of Ex 'd', 'n', 'e' and 'p' electrical equipment in explosive atmospheres
  • EX03: Preparation and installation of Ex 'i' equipment and systems in explosive atmospheres
  • EX04: Inspection and maintenance of Ex 'i' equipment and systems in explosive atmospheres

CompEx is fast becoming a mandatory requirement on many offshore plants as it offers complete reassurance to employers managing the safety of these potentially hazardous workplaces.

Course Objectives

Delegates completing a CompEx course will be able to;

  • Prepare and install electrical apparatus in potentially explosive atmospheres
  • Inspect and maintain electrical apparatus in potentially explosive atmospheres

Course Content

A CompEx course includes;

  1. DSEAR
  2. Classifications
  3. Gas groups
  4. Dust protection
  5. IP ratings
  6. Impact protection and other environmental influences
  7. Ignition sources
  8. Marking and identification
  9. Legislation, Directives and Standards
  10. Earthing and Bonding
  11. Protection methods in detail
  12. Ex’d’, Ex’e’, Ex’n’, Ex’p’, Ex’i’, Ex’m’, Ex’o’, Ex’q’
  13. Dust protection by enclosure
  14. Wiring systems and glanding
  15. Installation, maintenance, inspection and testing


The qualifications required for eligibility for enrolment on a CompEx course can be found in JTL925: Qualifications Criteria For Entry Onto CompEx Courses >>

Courses Available

View the full range of CompEx courses available at AIS Training >>


When booking your CompEx EX01 - EX04 you can also include a stay in our on-site hotel before adding your course to the basket. Click BOOK NOW on the right of this course page, select your preffered location and date, and there is a section of the 'book a course' page that asks if you require a hotel room. You can then choose your room and duration of stay from the drop-down menu, before proceeding to add to basket.

PLEASE NOTE: If the duration of the hotel stay you require is not present in the drop-down menu, you can call our team on 0330 202 0668 and they will be happy to accomodate your request.