![]() An outlet is defined by the NEC as "a point in the wiring system at which current is taken to utilization equipment".For larger commercial installations, 277/480 V or 347/600 V three phase is common. The third phase, the "high leg" of the system (also referred to as the "wild leg"), has 208 V to neutral and is not usually used for single-phase connections, so is distinctively colored. 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 most common three-phase system will have three hot legs, 208 V to each other and 120 V each to the neutral. The most common residential and small commercial service in Canada and the U.S., single split-phase, 240 V, features a neutral and two hot legs, 240 V to each other, and 120 V each to the neutral. Leg as in "hot leg" refers to one of multiple hot conductors in an electrical system.It is either bare or has green insulation. It is often called the "ground wire," or safety ground. Ground is a safety conductor with a low impedance path to earth.Hot is any line or neutral conductor (wire or otherwise) connected with an electrical system that has electric potential relative to electrical ground or line to neutral.Formally, the neutral is called the "grounded conductor" as of the 2008 NEC, the terms "neutral conductor" and "neutral point" have been defined in the Code to conform to what had been common usage. United States electrical codes require that the neutral be connected to earth at the "service panel" only and at no other point within the building wiring system. ![]() The neutral is connected to the center tap of the power company transformer of a split-phase system, or the center of the wye connection of a polyphase power system. North American standards state that the neutral is neither switched nor fused except in very narrowly defined circumstances. Neutral wire is the return conductor of a circuit in building wiring systems, the neutral wire is connected to earth ground at only one point.For electrical wiring in Canada, the Canadian Electrical Code is a very similar standard published in Canada by the Canadian Standards Association.Īlthough much of the electrician's field terminology matches that of the electrical codes, usages can vary: The US National Electrical Code is applicable to many areas in the US where state, county or local authorities have adopted it. It is also designed to provide proper function, and is also influenced by history and traditions of the location installation. Electrical wiring in North America follows the regulations and standards applicable at the installation location.
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