Applies for the connection of electrical copper conductors, rigid stranded and/or flexible, having a cross-sectional area from 35 mm2 flexible up to and including 300 mm2 and equivalent AWG/kcmil sizes with a rated voltage not exceeding 1 000 V a.c. and a frequency up to and including 1 000 Hz, and 1 500 V d.c. Has the status of a group safety publication in accordance with IEC Guide 104.