What does a wiring diagram primarily illustrate?

A wiring diagram primarily illustrates physical wiring connections. It provides a visual representation of how electrical components are interconnected within a system. This type of diagram focuses on showing the layout and arrangement of wires, terminals, and devices, which is crucial for understanding the physical setup of an electrical installation.

Wiring diagrams help technicians and electricians follow the correct wiring paths and ensure that connections are made properly, facilitating troubleshooting and installation. By specifying the exact points at which wires connect to components, these diagrams serve as essential tools in both new installations and maintenance tasks.

While the other options relate to aspects of electrical systems, they do not capture the primary function of a wiring diagram. For example, electrical flow pertains to how current moves through a circuit and is typically illustrated in different types of diagrams, while load calculations involve the analysis of the electrical load in a system. Component specifications provide details about the characteristics and ratings of components themselves, rather than their interconnections, which is the focus of a wiring diagram.