... )resistant 4kv in 1min under water 3)fireproof 4)waterproof Insulation piercing connector(IPC) Self-seam frame, wetproof, waterproof, and anti-corrosion ... , extend the using life of insulated lead and connector. Adopted special connecting tablet, apply to joint of Cu ... commection scope(1.5mm² -240mm² ).Standard: NFC33020, NFC33003, IEC Low Voltage Series Insulation Piercing Connectors