In wiring diagrams, what do solid lines usually indicate?

In wiring diagrams, solid lines typically indicate factory-installed line-voltage wiring. This representation is used to differentiate between various types of electrical circuits in the schematic, primarily indicating wiring that carries high voltage, which is pre-installed during the manufacturing process.

The use of solid lines helps technicians identify where the primary power connections are located and makes it easier to understand the layout and function of the circuit. Factory-installed wiring is critical for ensuring safety and compliance with electrical codes, as it has been installed according to industry standards and specifications. Recognizing this is important for anyone working on or analyzing electrical systems, as it helps to prevent mistakes during installation or troubleshooting.

In contrast, field-installed wiring is usually depicted with dashed lines, while electrical ground connections might use a different set of symbols or designations entirely, and signal transmission lines may also have distinct representations to clarify their function and destination within the system. This visual distinction is important for efficient and safe electrical system management.