Which type of line indicates a permanent installation in electrical schematics?

A solid line is used to indicate a permanent installation in electrical schematics because it represents a continuous and unbroken connection that signifies the physical presence or installation of wiring, components, or pathways within the system. Solid lines convey stability and permanency, which is crucial in electrical diagrams where understanding the fixed relationships between various components is essential for proper interpretation and functionality.

In contrast, dashed lines typically represent temporary connections, hidden or concealed elements, or other symbolic representations that do not indicate physical wiring. Dotted lines can indicate alternate routes or temporary setups. Colored lines might signify specific functions or circuit types but do not inherently indicate permanence. Understanding these distinctions helps in accurately reading and interpreting electrical schematics.