Latest active version (as of this report): IEC 60352-2:2020 RLV (Redline version) – supersedes earlier editions (2006, 1990).
Title: Solderless Connections – Part 2: Crimped Connections – General Requirements, Test Methods, and Practical Guidance iec 60352-2 pdf
Measured using 4-wire Kelvin method. Difference from a reference length of wire (voltage drop method). Minimum pull-out force (N) = function of wire cross-section (mm²) and strand class. Latest active version (as of this report): IEC