Regulation 10—Qualification of welder(1) A person shall not weld any material in a pipeline unless that person is certified by a recognised person appointed by the Energy Commission.(2) A certified welder may qualify to weld on a pipe to be operated at a pressure that produces a hoop stress of less than twenty per cent of the specified minimum yield strength by conducting an acceptable test weld, for the process to be used under the test set forth in the paragraph 1 of the Seventeenth Schedule.(3) Despite subregulations (1) and (2), a certified welder who intends to make a welded service line connection to a main shall first perform an acceptable test weld as indicated under paragraph 2 of the Seventeenth Schedule as a requirement of the qualifying test.