1.4 Work health and safetySafe working practices shall be employed when working on gas installations. The process of installing gas appliances shall take into consideration relevant work health and safety (WHS) requirements. These requirements pertain to all aspects of access, installation, operation and maintenance. Persons installing gas appliances shall be aware of their responsibilities and be trained and qualified in accordance with local WHS requirements. Precautions shall be taken to avoid any electrical hazards present in the gas installation.WARNING — SAFETY PRECAUTIONS NEED TO BE OBSERVED WHEN CUTTING INTO PIPEWORK OR DISCONNECTING FITTINGS AND DEVICES ON PIPEWORK. THERE HAVE BEEN FATALITIES AND INJURIES THAT HAVE BEEN ATTRIBUTED TO GAS SERVICES CARRYING AN ELECTRICAL CURRENT.1.5 System of unitsInternational System of Units (SI) is used in this Standard.NOTE Appendix A provides a list of conversion factors for other commonly used units.