EX01R to EX04R – Gas and Vapour Environments – Refresher

Course Overview

3 days
Price upon request
Open Courses:

3rd April 2024

Dates or group bookings can be catered for upon request.
Bologna, Italy
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Target Audience

Candidates who wish to re-validate their current and valid CompEx Certificate prior to its expiration. If the candidate has not been actively involved in Ex work (inspection, maintenance and installation) then it is highly recommend retaking the EX01-04 course.

Candidate Pre-Qualifications

The Ex01R-Ex04R refresher course must be taken within five years of taking the original Ex01-Ex04 course. If the frequency between the Ex01-Ex04 and the refresher course is greater than five years, then the full five-day Ex01-Ex04 must be undertaken. Evidence of attendance to a previous Ex01-Ex04 course will be requested at the registration stage; if evidence cannot be provided then attendance to the Ex01R and Ex04R course will be denied.

Course Overview

The course is intended ensure that the candidate working in explosive atmospheres formed by gases, vapours & mists are aware of any changes that may have occurred since they completed the original Ex01-Ex04 CompEx course. It covers updates (if applicable) for equipment selection, installation, inspection and maintenance of electrical installations in explosive atmospheres. The course covers elements of the installation requirements from a practitioner’s viewpoint. This includes but not limited to electrical protection concepts, selection of equipment, cabling and cable glands etc. For the inspection module then a review of a typical electrical and intrinsically safe installation is also covered.

All presentation material is in Microsoft PowerPoint. Electronic handouts are given to candidates and are intended to be used as an aide-memoir tool in the future. (Hard copies are available at a cost)

Course Content:

  • Explosive Atmospheres
  • Area Classification
  • ATEX Directive 2014/34/EU was 94/9/EC (Equipment)
  • Equipment Protection Levels (EPL)
  • Protection Concepts
  • International (Ingress) Protection
  • Cables and Glands
  • Installation practices for equipment installed in gas/vapours environments
  • Inspection and Maintenance for equipment installed in gases/vapours


The refresher assessment consists of:

  • a multi-matrix written paper (selecting multiple answers)
  • a practical which involves selecting appropriate equipment, glands and accessories based on environmental and classification requirements,
  • a written paper on maintenance (candidate will be expected to write down how to rectify faults); and
  • an inspection based on photographs of faults.