While not mandated by the National Electrical Code (NEC), pigtails may be necessary, especially with non-self-grounding outlets. Pigtails transform the connection point from the receptacle to a wire nut, minimizing the risk of circuit failure. I am currently roughing in gang boxes for outlets and lights that. For most residential 15-amp circuits, this means using 14 American Wire Gauge (AWG) wire, while 20-amp circuits require 12 AWG wire or larger. We'll guide you through the fundamentals of creating secure links between multiple conductors and terminals. Pigtails can be used for certain scenarios, such as adding light. Whether you're replacing an outlet or adding a new fixture, knowing when and why to use a pigtail can save you time and prevent potential hazards. It's a small detail with a big impact on your electrical setup.