Commissioning and site testing of a Type BA Device (Reduced Pressure Zone valve) assembly must only be carried out by a City and Guilds accredited tester who has been approved by the water supplier as competent to test Type BA Devices.
Testing shall be carried out at intervals not exceeding 12 months and on completion of a site test, a test report certificate must be completed by the tester with copies submitted to the water supplier and the person responsible for the device.