Defines sound pressure and sound intensity measurement methods by which sound power levels of transformers, reactors and their associated cooling auxiliaries may be determined. The methods are applicable to transformers and reactors covered by the IEC 60076 series, IEC 60289, IEC 60726-11 and the IEC 61378 series (IEC 60076-11, parts of IEC 60076 and parts of IEC 61378 have been published in South Africa as identical adoptions under the designations SANS 60076-11, SANS 60076 and SANS 61378), without limitation as regards size or voltage and when fitted with their normal cooling auxiliaries. Primarily intended to apply to measurements made at the factory.