Electrical Panel Design - Transformers & Power Supplies Notice that the drawing of the circuit breaker incorporates an icon that indicates that the circuit will open during a current surge.

The electrical panel wiring diagram above displays an example of a circuit breaker as well as multiple fuses that protect variable frequency drives. When a fuse is triggered, it must be replaced before resuming operation.Įlectrical Panel Wiring Diagram - Variable Frequency Drive Wiring Depending on code, a fuse may be used on its own or with a combination of a breaker. Fuses | A fuse is a static device that will protect equipment and personnel from current surges.This device is used to cut-off all power from the electrical panel and will automatically trip when a certain current level (based on the breaker rating) is exceeded. An electrical panel breaker is similar to what you may found in household applications, but with much higher ratings. Electrical Panel Circuit Breaker | Typically the entry-point for external current into the panel.Power devices within an electrical panel are used to deliver the current required to each device and to protect them from overcurrent situations. The electrical panel above includes a MicroLogix PLC, protection devices (fuses), connection devices (unmanaged switch, EtherNet to RS232 converter), terminal blocks and a power supply. In this section, we’d like to start by looking at a standard electrical panel, going over the components and understanding the choices behind certain components and layout decisions.Įlectrical Panel - MicroLogix Based Control System It is important to be familiar with the code that applies in your area before designing a panel. Furthermore, each state may choose to adopt a different version of the code based on the release. In the United States, this authority is the National Fire Protection Association (NFPA) and the code is called the National Electrical Code (NEC). It is important to note that electrical panel wiring diagrams must follow local authorities that dictate the standards that must be respected within the panel. Although electrical panels may not be overly complex from the first glance, a lot of engineering goes into selecting proper devices, sizing wiring and designing the layout of the panel that is documented by the electrical panel wiring diagrams. As electrical panels are what will contain control systems, panel wiring diagrams are commonly encountered by PLC technicians and engineers. Electrical panel wiring diagrams are used to outline each device, as well as the connection between the devices found within an electrical panel.

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