Proving Gas Systems
Gas Proving Systems are required under BS6173 if any appliance is installed that is not fitted with a Flame Failure Device (FFD). This would normally only be applicable to small gas rings and hobs. It should be noted however that older grills, and even ovens, often have not been equipped with an FFD. In any event, a well designed gas leakage control system will test for external leaks not just the odd unprotected gas tap that may have been left turned on.