Grounding pigtails are the most common variety. These are short green or bare copper wires with a ring terminal or fork terminal on one end, designed to connect to the grounding screw on outlets and switches. They are required by the National Electrical Code (NEC) in many wiring. A pigtail in electrical wiring is a short wire used to connect multiple wires to a single point or device. It ensures a secure connection by combining wires with a wire connector, like a twist-on connector or a wire nut, and then linking them to the intended terminal or fixture. Turn the power back on and double-check that everything is working. Common fiber pigtail types include LC, SC, ST, and FC, available in single-mode (OS2) and multimode (OM3/OM4). Need fiber pigtails or connectors? Browse CZT fiber optic products — LC, SC, and MPO pigtails and patch. What is the purpose of the 'pigtail' wiring method for outlets? Open up the electrical box behind almost any professionally wired outlet in a modern home and you will likely find a small bundle of wires joined together with a wire nut, each with a single short conductor running out to the. A pigtail connector is a short length of wire with a factory-terminated connector on one end and bare, exposed wires on the other.