NF C26-631-3-2*NF EN 62631-3-2:2016 Dielectric and resistive properties of solid insulating materials - Part 3-2 : determination of resistive properties (DC Methods) - Surface resistance and surface resistivity
1982NF C26-215:1982 Method of testing insulating materials. Methods of test for volume resistivity and surface resistivity of solid electrical insulating materials.