CompEx Ex01–Ex04: Ex electrical equipment, gas & vapours

Awarding body: CompEx Certification Ltd. Checked against the body's own page on 23 September 2026.

Not required by law anywhere we have checked. Where it is needed, employers and site operators require it by contract. Valid for 5 years, as stated by CompEx Certification Ltd.

Who requires it

• United Kingdom: Not required by law — employers and site operators require it by contract.
• Internationally: Not required by law — employers and site operators require it by contract.

Is another scheme accepted instead?

• IECEx Certificate of Personnel Competence: Comparable content, separate schemes. An employer specifies one; holding the other is not automatic acceptance.

Hiring for a role that asks for this? Paste its job description for a hiring-feasibility brief — including whether the credential narrows who can fill it. Your first 2 briefs are free.

This page states facts and links the awarding body; it does not reproduce the standard. Requirements change — confirm with the body and with the operator before relying on them.