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  2. Knob-and-tube wiring - Wikipedia

    en.wikipedia.org/wiki/Knob-and-tube_wiring

    Other ceramic pieces would typically be used as a junction point between the wiring system proper, and the more flexible cloth-clad wiring found in light fixtures or other permanent, hard-wired devices. When a generic power outlet was desired, the wiring could run directly into the junction box through a tube of protective loom and a ceramic ...

  3. NEMA connector - Wikipedia

    en.wikipedia.org/wiki/NEMA_connector

    The 5-20R receptacle has a T-shaped neutral hole, to accept both 5-15P and 5-20P plugs. An acceptable alternative version of the 5-20R receptacle has a rectangular slot that will only accept 5-20P plugs. The 5-30 and 5-50 are physically larger, with 1 in (25.4 mm) between power pins; 5-30 also has an L-shaped neutral blade. [17]

  4. 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 ...

  5. Three-prong adaptor - Wikipedia

    en.wikipedia.org/wiki/Three-prong_adaptor

    The screws and outlet boxes were either connected to the neutral, or connected to nothing. Only in some jurisdictions where 2-wire non-metallic cable was restricted and armored cable was required (and still in good condition), do cheater plugs work safely as intended.

  6. Electrical connector - Wikipedia

    en.wikipedia.org/wiki/Electrical_connector

    AC power plugs are also commonly circular, for example, Schuko plugs and IEC 60309. NMEA 2000 cabling using M12 connectors. The M12 connector, specified in IEC 61076-2-101, is a circular electrical plug/receptacle pair with 12mm OD mating threads, used in NMEA 2000, DeviceNet, IO-Link, some kinds of Industrial Ethernet, etc. [16] [17]

  7. Mini-DIN connector - Wikipedia

    en.wikipedia.org/wiki/Mini-DIN_connector

    Color-coded PS/2 connection ports (purple for keyboards and green for mice) on the rear of a personal computer An S-video connector: because this is a female connector, Pin 1 is at lower right. Mini-DIN connectors are 9.5 millimetres (3 ⁄ 8 in) in diameter and come in seven patterns, with the number of pins from three to nine. Each pattern is ...

  8. Ceiling rose - Wikipedia

    en.wikipedia.org/wiki/Ceiling_rose

    The physical carving of a rose on a ceiling was used for this purpose during the rule of England's Tudor King Henry VIII and has over the centuries evolved into a standard item of domestic vernacular architecture, to such an extent that it now constitutes a term for the aforementioned circular device that conceals and comprises the wiring box ...

  9. Telephone jack and plug - Wikipedia

    en.wikipedia.org/wiki/Telephone_jack_and_plug

    For example, telephone cables in the UK typically have a BS 6312 (UK standard) plug at the wall end and a 6P4C or 6P2C modular connector at the telephone end: this latter may be wired as per the RJ11 standard (with pins 3 and 4), or it may be wired with pins 2 and 5, as a straight-through cable from the BT plug (which uses pins 2 and 5 for the ...

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