This part of ISO 8528 defines terms and specifies design criteria arising out of the combination of a recipro- cating internal combustion (RIC) engine and an alternating current (a.c.) generator when operating as a unit. It applies to a.c. generating sets driven by RIC engines for land and marine use, excluding generating sets used on aircraft or to propel land vehicles and locomotives. For some specific applications (for example, essential hospital supplies, high-rise buildings, etc.) supplemen- tary requirements may be necessary. The provisions of this part of ISO 8528 should be regarded as a basis. For generating sets driven by other reciprocating-type prime movers (e.g. sevvage gas engines, steam en- gines), the provisions of this part of ISO 8528 should be used as a basis.