This guide applies to oil-immersed transformers and reactors. It does not cover Class 1E equipment for nuclear plants, which is covered by IEEE Std 344-1987, IEEE Recommended Practice for Seismic Qualification of Class 1E Equipment for Nuclear Power Generating Stations (ANSI) 111. It provides direction for establishing procedures to verify that oil-immersed power transformers and reactors, as installed, will meet their performance requirements during and following a design earthquake. It may be used by equipment manufacturers to establish procedures that will substantiate performance claims, or by equipment users to verify performance of representative power transformers and reactors. Whenever the term "transformer" is used, it should be understood to mean "reactor" as well.