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Wiring Diagram What is a Wiring Diagram? A wiring diagram is a simple visual representation of the physical connections and physical layout of an electrical system or circuit. It shows how the electrical wires are interconnected and can also show where fixtures and components may be connected to the system. When and How to Use a Wiring Diagram. Figure 4—Schematic diagram Wiring diagram (or pictorial) a simplified conventional pictorial representation of an electrical circuit. It shows the components of the circuit as simplified shapes, and how to make the connections between the devices. A wiring diagram usually gives more information about the. Figure 6 is a diagram for a 480/276-volt, three-phase, four-wire system. This system serves hotels, shopping centers, etc. Transformers are used to get 120-volt single-phase circuits. Figure 7. Figure 7 shows the system used for large industrial plants where most of the load consists of motors. It is a 480-volt delta three-phase system. From an electrical standpoint, industrial machine equipment and tools - from drill presses to multi-motored automatic machines - can present special fire and shock hazards. NFPA 79 Electrical Standard for Industrial Machinery, helps you ensure fire safety by addressing the electrical considerations specific to equipment, apparatus, and systems used in industrial manufacturing processes. Switch Wiring Diagrams A single switch provides switching from one location only. “Single-Pole” may sound simple, but there are different ways to wire a Single-Pole Switch. The power can come from either the switch box or the fixture box and a set of electrical switch wiring diagrams will explain each of these scenarios to you clearly. ELECTRICAL AND ELECTRONICS DIAGRAMS USAS Y14.15 -1966 USA STANDARD APPROVED includes the following 15-1 Scope 15-2 Definitions 15-3 General Infonnation 15-4 Single-Line Diagrams, General 15-5 Single-Line Diagrams (Electronics and Communications) 15-6 Single-Line Diagrams (Power Switchgear and Industrial Control. The standard electrical symbols are smart, industrial standard and vector-based for electrical schematic diagrams. Most of electrical symbols can change their appearance, style and color according to A versatile cross-platform mind mapping tool. Wiring diagrams help technicians to see how the controls are wired to the system. Many people can read and understand schematics known as label or line diagrams. This type of diagram is like taking a photograph of the parts and wires all connected up. These diagrams show the actual location of parts, color of wires, and how they are connected. Electrical wiring diagrams of a PLC panel In an industrial setting a PLC is not simply “plugged into a wall socket”. The electrical design for each machine must include at least the following components. In '''Figure 2''', the ''input ''power lines (L1, L2, and L3) and the components that conduct electrical energy to the motor are shown on the right side of the diagram. This portion of the diagram also shows the ''series resistors'' (R1, R2, and R3) that reduce voltage to the motor during startup.