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Single-pole circuit breakers feed 120 V circuits from one of the 120 V buses within the panel, or two-pole circuit breakers feed 240-volt circuits from both buses. 120 V circuits are the most common, and used to power NEMA 1 and NEMA 5 outlets, and most residential and light commercial direct-wired lighting circuits.
In the US, where split-phase supplies are common, in a branch circuit with more than one live conductor, each live conductor must be protected by a breaker pole. To ensure that all live conductors are interrupted when any pole trips, a common-trip set of breakers must be used. These may either contain two or three tripping mechanisms within one ...
IEC 60309 (formerly IEC 309 and CEE 17, also published by CENELEC as EN 60309) is a series of international standards from the International Electrotechnical Commission (IEC) for "plugs, socket-outlets and couplers for industrial purposes".
A simplified diagram of a two-phase alternator [1] Two-phase electrical power was an early 20th-century polyphase alternating current electric power distribution system. Two circuits were used, with voltage phases differing by one-quarter of a cycle, 90°. Usually circuits used four wires, two for each phase.
An older, but still widely used, high-leg delta system uses three phases with 240 volts phase-to-phase for motor loads, and 120 volts for lighting loads by use of a center-tapped transformer; two of the phases are 120 volts to neutral. The third phase, the "high leg" of the system (also referred to as the "wild leg"), has 208 V to neutral and ...
Volume 1: General requirements; Volume 2: Circuit-breakers; Volume 3: Circuit-breakers, circuit-breakers, switch-disconnectors and switch-fuse units; Volume 4-1: Contactors and motor starters; electromechanical contactors and motor starters[1] Volume 4-2: Contactors and motor starters - Semiconductor motor controllers and starters for a.c. voltage
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A steam turbine used to provide electric power. An electric power system is a network of electrical components deployed to supply, transfer, and use electric power. An example of a power system is the electrical grid that provides power to homes and industries within an extended area.