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Main text The supplementary comparisons of national standards of ratio error and phase displacement of AC voltage of power frequency have been performed among the following national metrological institutes (NMIs): VNIIMS, MIKES-TKK, SP, CMI, LCOE, BIM and SE “Ukrmetrteststandard”. The description and measurement results are presented in the present report. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/. The final report has been peer-reviewed and approved for publication by the CCEM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).