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ACS or Accredited Certification Scheme is the means by which gas operatives are assessed to prove their competence in gas safety. Subject to certain provisions, the law requires all persons working on gas to be competent to do so. Unless a person has been assessed through the above scheme they have not proved competence and are not legally able to carry out any work to a gas appliance or system. Upon successful completion of assessment a certificate valid for five years is issued as proof that competence has been demonstrated. Details of all operatives that are deemed competent are also kept by the registration body Gas Safety Register.