This Standard specifies requirements for self-contained transportable electricity generating sets (hereinafter referred to as 'generating sets') driven by internal combustion engines and intended to provide an independent 50 Hz a.c. supply, of low or medium voltage, single-phase or three-phase, and with outputs up to 25 kW. They may be portable, transportable, or mobile. The requirements apply to auxiliary power circuits of electric arc welding machines (see AS 1966.2) but not to their main welding circuits. This Standard does not apply to generating sets intended solely for charging batteries. For electrical safety requirements, this Standard shall be read in conjunction with AS 3100.NOTES:1. A generating set may include a separate extra-low voltage d.c. output, e.g. 12 V, for battery-charging purposes.2. The terms 'extra-low voltage', 'low voltage', and 'medium voltage' are as defined in AS 3000 and AS 3100.3. Generating sets complying with this Standard are not normally suitable for operation in parallel with other sets or with reticulated supply (even where such is permissible) because of the lack of controls and instrumentation.4. Appendix A lists information which should be supplied with enquiries and orders for generating sets, and Appendix B makes recommendations on the use of generating sets.