The power symbol that represents the live wire is the "hot" or "live" wire, typically indicated by a solid line or a solid color, such as black or red. This symbol is universally recognized in electrical systems and diagrams to denote the conductive wire that carries electrical current. The live wire is the primary source of power in an electrical circuit and is essential for the operation of appliances and devices.

The reason for this symbolization is rooted in safety and standardization. According to the National Electrical Code (NEC), the live wire is the one that carries the electrical current and is connected to the power source. It is crucial to identify the live wire correctly to prevent electrical hazards, such as electric shocks or fires. The NEC provides guidelines for electrical installations and wiring practices, ensuring that the live wire is distinctly marked and handled with caution.

Data from the NEC, which is widely adopted in the United States, indicates that the live wire is typically marked with a solid black or red line. For example, in residential wiring, the live wire is often black, while the neutral wire is typically white. In commercial and industrial settings, the colors may vary, but the live wire is always clearly distinguished. This standardization helps electricians, maintenance personnel, and homeowners to quickly identify and safely manage the live wire during installation, repair, or maintenance work.

In summary, the power symbol representing the live wire is the "hot" or "live" wire, indicated by a solid line or color, such as black or red. This symbol is essential for safety and standardization in electrical systems, as it helps to prevent accidents and ensure proper functioning of electrical circuits. The National Electrical Code provides guidelines for identifying and handling the live wire, emphasizing the importance of clear and consistent marking practices.