ACS (Accredited Certification Scheme)
The nationally recognised assessment scheme that gas engineers pass to show competence for the categories of work they do.
Engineers hold ACS certificates for each area of work, such as core domestic safety or particular appliance types. Certificates are usually renewed every five years.
Gas Safe Register uses these qualifications to decide what each engineer is registered to do.
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A plain-language explanation, not a technical procedure or legal advice. Follow the current regulations, industry procedures and manufacturer’s instructions.