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  2. Electrical wiring in North America - Wikipedia

    en.wikipedia.org/wiki/Electrical_wiring_in_North...

    Lighting and general purpose receptacles are at 120 volts AC, with larger devices fed by three wire single-phase circuits at 240 volts. In commercial construction, three-phase circuits are often used. Common 3 phase configurations within a building are 208v/120 wye, 120/240 center tapped delta and 480v/277v wye. Lighting is usually fed by 277 V ...

  3. Three-phase electric power - Wikipedia

    en.wikipedia.org/wiki/Three-phase_electric_power

    Three-phase transformer with four-wire output for 208Y/120 volt service: one wire for neutral, others for A, B and C phases. Three-phase electric power (abbreviated 3ϕ [1]) is a common type of alternating current (AC) used in electricity generation, transmission, and distribution. [2]

  4. High-leg delta - Wikipedia

    en.wikipedia.org/wiki/High-leg_delta

    Current practice is to give separate services for single-phase and three-phase loads, e.g., 120 V split-phase (lighting etc.) and 240 V to 600 V three-phase (for large motors). However, many jurisdictions forbid more than one class for a premises' service, and the choice may come down to 120/240 V split-phase, 208 V single-phase or three-phase ...

  5. NEMA connector - Wikipedia

    en.wikipedia.org/wiki/NEMA_connector

    NEMA L13 series devices are three-pole, three-wire, non-grounding devices for three-phase 600-volt devices. Designs exist for 30-ampere (L13-30) devices and L13-30 devices were commercially available from at least one manufacturer (Bryant Electric).

  6. File:3 phase AC waveform.svg - Wikipedia

    en.wikipedia.org/wiki/File:3_phase_AC_waveform.svg

    This cycle will repeat 50 or 60 times per second, depending on the power system frequency. The colors of the lines represent the American color code for 120v three-phase. That is black=VL1 red=VL2 blue=VL3: Date: 30 December 2008: Source: File:3-fas-spänningar.svg: Author: User:J JMesserly modification of original svg by User:SiriusA: Other ...

  7. IEC 60446 - Wikipedia

    en.wikipedia.org/wiki/IEC_60446

    The international standard IEC 60446 Basic and safety principles for man-machine interface, marking and identification - Identification of equipment terminals, conductor terminations and conductors was a standard published by the International Electrotechnical Commission (IEC) that defined basic safety principles for identifying electrical conductors by colours or numerals, for example in ...

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  9. Electrical code - Wikipedia

    en.wikipedia.org/wiki/Electrical_code

    In the United States, colour-coding of three-phase system conductors follows a de facto standard, wherein black, red, and blue are used for three-phase 120/208-volt systems, and brown, orange or violet, and yellow are used in 277/480-volt systems. (Violet avoids conflict with the NEC's high-leg delta rule.)

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