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.


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 @


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 operate the CompEx Scheme, is now approved as a UKAS Accredited Certification Body No 0270.

Denis Hird JTL CEO commented ‘We are so pleased that this recognition has been achieved to reflect the high standards to which JTL works and how we hope that it will contribute to the further development, recognition and expansion of the important CompEx scheme both within the UK and internationally.’

Martin Jones CompEx Scheme Operations Manager added that ‘This accreditation can only strengthen the CompEx Scheme as the Competency Scheme of choice for all offshore & onshore operators, employers and employees who are working in explosive atmospheres throughout the world'.

UKAS Accredited Certification Body No 0270