The new version of the Guidance Notes to the PER Revision 2 was published on 17 November 2017, which introduces significant changes: Definitions and Guidance Notes (GN) to the effect… certificate GN “(a) For Regulation 17 a Certificate of Conformance (CoC) is issued by a Gas Practitioner that certifies that the gas installation and pressure equipment conforms to the PER. Where the gas practitioner is also the manufacturer only one certificate is required.” GN “(b) certificate […]