On an electrical schematic, how are subassemblies indicated?

Subassemblies on an electrical schematic are indicated using dashed-line outlines. This convention is widely accepted in technical drawings because it visually distinguishes these components from other elements of the schematic. Dashed lines suggest that the subassembly is a separate entity that can be treated as a unit but is not part of the primary wiring or connection of the main circuit. This approach helps simplify the schematic for readability and organization, allowing engineers and technicians to quickly understand the structure and function of the overall electrical system.

In contrast, solid lines typically represent the primary connections and electrical pathways, while dotted lines might indicate less critical or temporary connections. Colored shading is not a standard method for indicating subassemblies and would not provide the clarity that dashed lines do. Therefore, the use of dashed-line outlines effectively communicates the concept of subassemblies in a clear and professional manner within electrical schematics.