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Specifies the dimensions that are of importance for mechanical interchangeability for E-cores, the dimensions of coil formers to be used with them, and the effective parameter values to be used in calculations involving them. The cores covered are intended for general applications at both low and high flux densities, but they also find uses in specialapplications such as pulse transformers. They are generally used in pairs. The use of "derived" standards, which give a more detailed specification of component parts whilst still permitting compliance with this standard, is discussed in annex A.