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WebDefinition. The National Electrical Code® (NEC®) defines a switchboard as a large single panel, frame, or assembly of panels on which are mounted, on the face, back, or both, switches, over current and other protection devices, buses, and usually instruments.. Theory. Switchboards enclose various devices. For example, the following illustration shows two … WebSep 26, 2024 · PBX is an acronym for "private branch exchange," an in-house telephone switching system used to interconnect both internal and external telephone extensions and networks. Its functions include least-cost routing for external calls, conference calling, call forwarding and call accounting. A PBX switchboard is a telephone system that uses ... An electric switchboard is a device that distributes electricity from one or more sources of supply to several smaller load circuits. It is an assembly of one or more panels, each of which contains switching devices for the protection and control of circuits fed from the switchboard. Several manufacturers make switchboards used in industry, commercial buildings, telecommunication facili… china seat wedge pillow