Most residential electrical systems in the U.S. operate at 120/240 volts, where 120 volts is used for standard appliances and 240 volts is used for heavy-duty appliances like dryers and ovens.
The green or bare copper wire is used for grounding to ensure the safety of the electrical system by providing a path to ground for electrical current.
The NEC requires electrical outlets to be placed at least every 6 feet along the floor line in residential homes to reduce the need for extension cords and enhance safety.
GFCIs are designed to protect against electrical shock by quickly shutting off power when they detect a ground fault or leakage current, which is particularly important in wet or damp locations.
For 20-amp circuits, 12-gauge wire is typically used because it can safely handle the current load without overheating.
