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We present the complete set of Feynman rules producing the rational terms ofkind R_2 needed to perform any 1-loop calculation in the Electroweak StandardModel. Our results are given both in the 't Hooft-Veltman and in the FourDimensional Helicity regularization schemes. We also verified, by using boththe 't Hooft-Feynman gauge and the Background Field Method, a huge set of Wardidentities -up to 4-points- for the complete rational part of the Electroweakamplitudes. This provides a stringent check of our results and, as aby-product, an explicit test of the gauge invariance of the Four DimensionalHelicity regularization scheme in the complete Standard Model at 1-loop. Theformulae presented in this paper provide the last missing piece for completelyautomatizing, in the framework of the OPP method, the 1-loop calculations inthe SU(3) X SU(2) X U(1) Standard Model.

Feynman rules for the rational part of the Electroweak 1-loop amplitudes