Of an output exceeding 375 kVA

85.02 - Electric generating sets and rotary converters. sets with corn ression-ignition internal combustion piston - engines Oeneratini ( esel or semi-diese engines) : P - - Of an output not exceeding 75 kVA 8502.12 - - Of an output exceeding 75 kVA but not exceeding 375 kVA 8502.13 - - Of an output exceeding 375 kVA 8502.20 - Generating sets with spark-ignition internal combustion piston engines 8502.1 1 - Other generating sets : - - Wind-powered 8502.39 - - Other 8502.40 - Electric rotary converters 8502.3 1 (I) ELECTRIC GENERATING SETS The expression " generating sets " applies to the combination of an electric generator and any prime mover other than an electrlc motor (e.g., hydraulic turbines, steam turbines, wind engines, reciprocating steam engines, internal combustion engines). Generating sets consisting of the generator and its prime mover which are mounted (or designed to be mounted) to ether as one unit or on a common base (see the General Explanatory Note to Section XVI), are c assified here provided they are presented together (even if packed separately for convenience of transport). Electric generating sets for welding e uipment are classified in this headin when presented separately, without their welding hea s or welding a liances. However, ey are excluded (heading 85.15) when presented together with their we mg heads or welding appliances. Ef f (Il) ELECTRIC ROTARY CONVERTERS These consist essentially of a combination of an electric generator and aprime mover consisting of an electric motor permanently mounted on a common base, though m certain cases the two functions are combmed in one unit with certain windings in common. They are used to transform the nature of the current (to convert fiom AC to DC or vice versa) or to change certain characteristics such as the volta e, frequency or phase of alternating current to convert, for example, the frequency of 50 to 00 cycles or to transform single phase to t ee phase current). Another type of rotary converter (sometimes known as a rotary transformer) is used to convert DC from one voltage to another. f 6, PARTS Sub'ect to the general provisions regarding the classification of parts (see the General Exp anatory Note to Section XVI), parts of the machines of this heading are classified in heading 85.03. -