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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. 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. 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. 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. 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. 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. 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.