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.
