The CompEx Scheme is now the global solution for validating core competency of employees and contract staff of major users in the gas, oil & chemical sectors, both with offshore and onshore activities - designed and developed by industry for industry.

**For an overview from the CompEx Operations Manager and the latest centres to be licensed  - See 'NEWS' webpage for details

Based upon the IEC Standards, primarily IEC 60079: Parts 10; 14 & 17, Competency Validation and Certification for electrotechnical and mechanical craftspersons and Application Design Engineers working in explosive atmospheres is available in over 12 modules (see Course Units) and the CompEx Certification Body, JTLimited is accredited to ISO/IEC 17024:2012 Conformity Assessment - General Requirements for bodies operating certification of persons who work in explosive atmospheres.


**A Pre-Learning material and Post-Course reference book 'Practitioner's Handbook No 186' is available directly from EEMUA's website sales @


**All CompEx Course candidates receive a copy of the CompEx Toolbox Guide Publication 214 'Electrical Installation and Maintenance in Potentially Explosive Atmospheres' - details for purchasing additional or replacement copies can be obtained by e-mailing 


Explosive atmospheres occur in onshore and offshore petrochemical plants and refining plants. They are also found in distilleries, paint spraying plants, flourmills, woodworking machine plants, chipboard and MDF pre-production areas, the water industry and all fuel forecourt environments. Failure to ensure safe working practices in these circumstances could result in the ignition of explosive gases or dust clouds leading to injury or even fatalities and the destruction of capital asset investments damaged by explosive blasts and fire.


Competency is only certificated only to individuals who:

  • Meet the necessary entry criteria to register for the selected CompEx modules (see below)
  • Pass the underpinning knowledge theory examinations
  • Pass the competency validation tests in the form of practical assessments on equipment utilised in explosive atmospheres


Competency can only be determined by having the underpinning knowledge in place and the ability to apply that knowledge to safely install, inspect and maintain equipment unique to explosive atmospheres. The portfolio of practical assessments and the end-test theory examination ensure this with all CompEx modules.


Find details of candidate entry requirements and the associated CompEx Certification by visiting the Registration page and clicking the link ‘JTL919 – CompEx Certification Process’.



 JT Limited understands the importance of impartiality and potential conflicts of interests in carrying out its certification activities. JT Limited’s full Statement of Impartiality can be found  here.






JTLimited, the company who own and operate the CompEx Certification Scheme is accredited by UKAS as Accredited Certification Body No 0270.

Martin Jones CompEx Operations Manager commented that ’Since our initial accreditation in October 2010 we have now progressed our accreditation to the latest standard ISO/IEC 17024:2012 Conformity Assessment – General requirements for bodies offering certification of persons. Our accreditation is specific to persons who work in explosive atmospheres and this recognition will further assist our worldwide growth’.

David Consterdine Quality Manager added that ‘The CompEx Scheme has been built on a robust and effective management system, the continued external UKAS accreditation of the scheme to ISO/IEC 17024:2012 provides further confidence and trust in the integrity of the scheme’.

UKAS Accredited Certification Body No 0270