an elctrical apparatus consisting predominantly of a panel on which are switches or other means of completing electrical circuits; -- used especially for the devices used in telephone exchanges. See sense 2.
An apparatus containing switches by means of which a connection may be made from an incoming telephone line to any one of numerous outgoing lines. The switches may be either mechanical or electronic, and the switching action may be automatic, controlled by signals in the incoming call, or manual, controlled by a switchboard operator. In older style manual switchboards, the circuits were connected by the use of patchcords, inserted into plugs.
An apparatus consisting of suitable jacks and cords, or special manual switches to connect outlying telephone instruments together.
A panel or supports upon which are placed the switches, controls, and meters for the control of electrical machines and systems.
telephone central where circuits are completed with patchcords
a device designed to metamorphose electricity received from power companies and supply electricity depending the purpose of use in buildings, factories, and hospitals
a device used to manually connect a group of telephones from one to another or to an outside connection
a unit which completes telephone circuits to connect calls. Before switchboards, telephones could only connect two locations (e.g. Major Walker's office with his lumberyard a few miles away). With a switchboard, a caller could be connected to any telephone in the network.
A floor-standing electrical power distribution device for use in commercial and industrial applications. It divides large blocks of electrical current into smaller blocks of current used by electrical equipment. NEC defines it as a large single panel, frame, or assembly of panels on which are mounted, on the face or back, or both, switches overcurrent and other protective devices, buses and usually instruments.
Panel that houses the devices that control the electrical circuits.
A large dead-front, single panel, frame, or assembly of panels, designed and manufactured as a unit, and which may house bussings, externally operable fused switches, circuit breakers, or other protective or regulating devices and associated instrumentation.