For the purposes of these regulations, gas-fitting work has been commissioned if the gas-fitting work has been issued with –

(a) a certificate of compliance for gas-fitting work, or a statement of compliance for gas-fitting work, by a gas-fitter that demonstrates that the gas installation or gas storage system may be safely operated and complies with the applicable standards; or

(b) an independent certification by a person approved by the Director that demonstrates design, fabrication, construction, installation, testing, and safe operation, in accordance with the accepted design, and the conditions of acceptance and applicable standards.