This variant to the CEI EN 61558-2-16: 2010-08 standard modifies the following parts of the basic standard: - art. 3 "Terms and definitions"; - art. 18 "Insulation resistance, dielectric strength and leakage current"; - art. 19 "Construction"; - art. 26 "Surface clearances, clearances and distances through insulation"; - Annex K "Insulated winding wires".