This standard pertains to transformers and inductors of both the saturating and nonsaturating type that are used in electronic power conversion equipment. Power conversion equipment includes items known as inverters@ converters@ power conditioners@ switching power supplies@ switched mode power supplies@ and the like. These items are mostly devices used to change dc power from one voltage to another@ to change dc power to ac@ and to change ac power of one frequency to another frequency. This equipment is best described as utilizing transistors@ silicon controlled rectifiers (SCRs)@ or other similar devices that switch power on and off at a high rate in order to achieve the power conversion or regulation desired. Therefore@ this standard covers the various transformers and inductors that are used in any of the above mentioned equipment or devices@ except for transformers operated directly from the mains.