These requirements cover the fire and casualty aspects associated with the mechanical performance and the electrical features of portable engine-driven generator assemblies.These requirements cover generators rated: 10 kilowatts or less@ 115 volts@ 2-wire single phase; 240 volts@ 2-wire single phase; 115/230 volts@ 3-wire single phase; 3- or 4-wire@ any voltage@ three phase. The generators may incorporate alternating or direct current generator sections for supplying energy to battery charging circuits. Only generators having systems voltages of less than 150 volts to ground are permitted for noncommercial applications.These requirements cover open ventilated generators having ventilating openings that permit the passage of external cooling air over and around the windings.These requirements cover generator parts and combinations of such parts.These requirements do not cover generators for use in hazardous locations as defined in the National Electrical Code@ NFPA 70.These requirements do not cover generators for marine use. That equipment is covered by the Standard for Marine Electric Motors and Generators@ UL 1112.These requirements cover only the identified hazard aspects of portable motor-generator assemblies. These requirements do not cover other possible hazard aspects of such equipment.