CompEx Courses

Gas & Vapours - Electrical 
Units Ex01, 02, 03, 04



3-7th June
17-21st June
1-5th July
15-19th July 

CompEx is the national training and assessment scheme for Electrotechnical personnel who work in potentially explosive atmospheres. Potentially explosive atmospheres occur in many industries such as petrochemical and refining plants. They may also be found in spraying plants, flour mills, woodworking machine plants and petrol forecourt environments. 

Failure to ensure safe and efficient working practices in these circumstances could result in the ignition of explosive gases or dust clouds leading to injury or even fatalities.

The scheme is a national training initiative between the Engineering Equipment and Materials Users Association and CompEx Certification and is supported by the Health and Safety Executive.

This course is the competency certification for working with gas and vapours in potentially explosive atmospheres.

Candidates who are successful in both the theory and practical assessments will receive a CompEx E- Certificate in Core Competence. Candidates are required to take the CompEx Electrical Refresher course every five years in order to remain current.



  1. EX01 Preparation and installation of Ex’d, Ex’e, Ex’n and Ex’p systems.
  2. EX02 Inspection and maintenance of Ex’d, Ex’e, Ex’n and Ex’p systems.
  3. EX03 Preparation and installation of Ex’i systems.
  4. EX04 Inspection and maintenance of Ex’i systems.


Please note that the course fee includes The Practitioner's Handbook No 186. This does not have to be purchased separately.


Assessment is undertaken using both practical assessments and an online examination that covers the four separate CompEx units.

Online exam - Candidates must undertake a multiple-choice online examination that consists of 60 questions answered over 1.5 hours.

Practical assessments - Candidates are required to undertake four practical assessments (one per unit):

Ex01 – 3 hours 45 minutes
Ex02 – 1 hour 30 minutes
Ex03 – 3 hours
Ex04 – 1 hour 15 minutes


This qualification is suitable for practicing electrical or instrument operatives who are involved in installing, inspecting and maintaining certified Ex electrical equipment in locations where gases and vapours can potentially create a hazardous area.


Five days


SETA, Second Avenue, Millbrook, Southampton, SO15 0LP


Due to the nature of CompEx courses you will need to contact our Commercial Admin Team to check availability and to make a booking.  Each of the CompEx courses has quite specific information required by CompEx Certification (The Awarding Body) which differs by course.  So to avoid confusion and to ease the booking process our Commercial Admin Team will be happy to help guide you through the necessary requirements.

"Excellent staff"

"Instructors Jon and Paul are great"