Abstract: An insulation-piercing connector interconnects an insulated conductor and a ribbon conductor embedded in an electrically insulating body. It comprises an insulation-piercing contact formed with a contact body and a tapered contact portion, and a housing device. A hole is made through both the electrically insulating body and ribbon conductor, this hole having a larger-diameter hole section and a smaller-diameter hole section separated by an annular abutment surface formed at least in part by one face of the ribbon conductor. The contact body comprises a larger-diameter body section inserted in the larger-diameter hole section, a smaller-diameter body section inserted in the smaller-diameter hole section, and an annular shoulder surface applied to the annular abutment surface to make contact with the ribbon conductor. The tapered contact portion has a threaded shank screwed in an axial threaded hole of the free end of the smaller-diameter body section to secure the tapered contact portion to the contact body.