A wiring diagram, typically referred to as a primary wiring diagram, mainly shows the flow and distribution of electrical power within a system. However, it does not provide details about control functions, monitoring, measurement, indication, or protection of the electrical circuit. In contrast, a secondary wiring diagram is specifically designed to illustrate these aspects—control, monitoring, measurement, indication, and protection. This type of diagram is essential for understanding how various components interact in an electrical system.
The secondary wiring diagram focuses on individual components, their parameters, or specific functions within the system. Because of this structured approach, it is easier to interpret and follow. For example, Figure 1-10 presents the secondary wiring diagram for current measurement using a current transformer (1TA) located in the power input unit shown in Figure 1-9. The ammeter PA depicted in the figure is a secondary device used to display the current flowing through the three-phase lines.
Secondary devices, such as ammeters, relays, and indicators, are directly connected to the secondary wiring and play a crucial role in monitoring and controlling the electrical system. These components are vital for ensuring the safe and efficient operation of electrical equipment. Understanding the difference between primary and secondary wiring diagrams is fundamental for anyone working with electrical systems, as each serves a distinct purpose in the overall design and functionality of the circuit.
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