Insulation Piercing Connector CRT  Piercing Connector CRT401 The waterproof insulation piercing connectors are suitable for majority types of LV ABC conductors as well as connections to service and lighting cable cores. When tightening the bolts, the teeth of the contact plates penetrate the insulation and establish a perfect contact. The bolts are tightened until the heads shear off. Tightening torque guaranteed(fuse nut). Stripping of insulation is avoided. Service condition: <1kV, 50/60Hz, -10°C to 55°C Standard: IEC 61284, EN 50483, IRAM2435, NFC33 020.