CompEx Refresher EX01 to EX04



CompEx is the national training and assessment scheme for electrotechnical craft personnel who work in potentially explosive atmospheres, such as on-and off-shore petrochemical plants, distilleries, petrol forecourt environments and flour mills.

CompEx is a national joint training initiative developed and implemented by the Engineering Equipment and Material Users Association (EEMUA) and JT Ltd, and is supported by the Health and Safety Executive (HSE).

JT Ltd who are the National training agent for the Electrical contracting industry has been appointed to develop, operate and manage the training provision across the UK and has licensed and accredited a number of centres to deliver the training and assessment.



The 2 day Refresher course intends to deliver competence based training and assessment in the selection, use, maintenance and inspection of electrical apparatus in potentially explosive atmospheres in accordance with the requirements of BS EN 60079 series relevant standards.

On completion of the assessments, these are sent to the Awarding Body for marking, and if successful the candidates shall be issued with a CompEx Ex01-Ex04 Refresher Certificate of Core Competency.



Delegates will have complted the 5 day CompEx course or 2 day CompEx Refresher course, and held the certificate no longer than 5 years.

The course assessments are conducted both in the centre test bay facilities and also the classroom, as follows:


Ex01 & Ex03 Installations - Classroom based pictorial test rig (one per candidate)

Ex01 Glanding Exercise - Test Bay Facility

Ex02 & Ex04 Inspections - Test Bay Facility

Online Multichoice Theory - Classroom based (one laptop per candidate)


Course Duration

The course is 2 days in duration.


Start & Finish Times

Day 1: 09:00 - 17:00 Course Syllabus

Day 2: 08:30 - 17:00 Assessments


Optimim Number

Maximum of 8 delegates per course.


Course Language

The course is delivered in English.  Therefore candidates must have a good standard of both written and verbal English.

Courses can be delivered in other languages however, this would need to be discussed prior to acceptance on the course.  It is the responsibility of the person making the booking to make Roxby aware of this requirement.


Training Aids/Requirements

Pre-reading factsheets, PowerPoint presentation, Sample instructional videos, information handouts, EEMUA toolbox giuide, review of assessment procedures.


Course Based On:

EX01R Preparation & Installation of EEx'd' 'e' and 'p' Systems.

EX02R Inspection & Maintenance of EEx'd' 'e' and 'p' Systems.

EX03R Preparation & Installation of EEx'i'a and 'i'b Systems.

EX04R Inspection & Maintenance of EEx'i'a and 'i'b Systems.


Course Syllabus

  • Area classification.
  • Gas groups.
  • Temperature classification.
  • I P Ratings.
  • Impact protection and other environmental influences.
  • Ignition sources.
  • Legislation.
  • Directives and standards.
  • Earthing and bonding.
  • Exi, Exd, Exs, Exe, Exp, Exm, Exn, Exo and Exq.
  • Wiring systems and glanding.
  • Installation.
  • Maintenance.
  • Inspection.
  • Testing.
  • Feedback and Review.


View Course Dates or Book a Course





Go to top