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  2. Residual-current device - Wikipedia

    en.wikipedia.org/wiki/Residual-current_device

    A residual-current device (RCD), residual-current circuit breaker (RCCB) or ground fault circuit interrupter (GFCI) [a] is an electrical safety device, more specifically a form of Earth-leakage circuit breaker, that interrupts an electrical circuit when the current passing through line and neutral conductors of a circuit is not equal (the term residual relating to the imbalance), therefore ...

  3. ANSI device numbers - Wikipedia

    en.wikipedia.org/wiki/ANSI_device_numbers

    A suffix letter or number may be used with the device number; for example, suffix N is used if the device is connected to a Neutral wire (example: 59N in a relay is used for protection against Neutral Displacement); and suffixes X, Y, Z are used for auxiliary devices.

  4. Ark-Tex Council of Governments - Wikipedia

    en.wikipedia.org/wiki/Ark-Tex_Council_of_Governments

    The Ark-Tex Council of Governments (ARK-TEX) is a voluntary association of cities, counties and special districts in Northeast Texas and Miller County, Arkansas. Based in Texarkana , the Ark-Tex Council of Governments is a member of the Texas Association of Regional Councils .

  5. GFI - Wikipedia

    en.wikipedia.org/wiki/GFI

    GFI may refer to: Caribbean Star Airlines, a defunct airline of Antigua and Barbuda; GFI Group, an American financial services company; Go4It, a British children's radio programme; Gold Fields, a South African mining company; Golden Future Institute, a school in Addis Ababa, Ethiopia

  6. Spark-gap transmitter - Wikipedia

    en.wikipedia.org/wiki/Spark-gap_transmitter

    Hertz's 450 MHz transmitter; a 26 cm dipole with spark gap at focus of a sheet metal parabolic reflector Jagadish Chandra Bose in 1894 was the first person to produce millimeter waves ; his spark oscillator (in box, right) generated 60 GHz (5 mm) waves using 3 mm metal ball resonators.

  7. Avometer - Wikipedia

    en.wikipedia.org/wiki/Avometer

    Despite continuing demand from customers, production was stopped in 2008, reportedly due to increasing problems with suppliers of mechanical parts. [16] The last meter to leave the factory was an AVOmeter Eight Mk 7 (Serial Number 6110-610/081208/5166) which was presented in February 2010 to the winner of a competition run by the Megger company.

  8. Minute and second of arc - Wikipedia

    en.wikipedia.org/wiki/Minute_and_second_of_arc

    It is especially popular as a unit of measurement with shooters familiar with the imperial measurement system because 1 MOA subtends a circle with a diameter of 1.047 inches (which is often rounded to just 1 inch) at 100 yards (2.66 cm at 91 m or 2.908 cm at 100 m), a traditional distance on American target ranges.

  9. Parabolic arch - Wikipedia

    en.wikipedia.org/wiki/Parabolic_arch

    Celler Modernista, Sant Cugat Museum Former main post office, Utrecht. Self-supporting catenary arches appeared occasionally in ancient architecture, for examples in the main arch of the partially ruined Sassanian palace Taq Kasra (now in Iraq), the largest single-span vault of unreinforced brickwork in the world, and the beehive huts of southwestern Ireland.