L is for Line, and N is for Neutral. The line wire in an electrical circuit carries the voltage, while the neutral wire returns the current back to the source. Together, these two wires create a complete circuit that supplies power to your home or business. However, if either of these wires becomes damaged, it can be dangerous. That’s why it’s important to know the difference between L and N and always use a qualified electrician when making any changes or repairs to your electrical wiring.