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  2. Time switch - Wikipedia

    en.wikipedia.org/wiki/Time_switch

    A time switch (also called a timer switch, or simply timer) is a device that operates an electric switch controlled by a timer. Intermatic introduced its first time switch in 1945, which was used for "electric signs, store window lighting, apartment hall lights, stokers, and oil and gas burners." A consumer version was added in 1952. [1]

  3. Knob-and-tube wiring - Wikipedia

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

    The failure of a neutral fuse would cut off power flow through the affected circuit, but the hot conductor could still remain hot relative to ground, an unexpected and potentially hazardous situation. Because of the presence of a neutral fuse, and in the event that it blew, the neutral conductor could not be relied on to remain near ground ...

  4. Light switch - Wikipedia

    en.wikipedia.org/wiki/Light_switch

    In larger lighting systems, for example warehouses or outdoor lighting systems, the required current may be too high for a manual switch. In these systems light switches control lighting contactors , a relay that allows the manual light switch to operate on a lower current, with smaller wiring than would be required in the main lighting circuit.

  5. Electrical wiring in North America - Wikipedia

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

    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. 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.

  6. Mathematics of three-phase electric power - Wikipedia

    en.wikipedia.org/wiki/Mathematics_of_three-phase...

    In a three-phase system, at least two transducers are required to measure power when there is no neutral, or three transducers when there is a neutral. [5] Blondel's theorem states that the number of measurement elements required is one less than the number of current-carrying conductors.

  7. Los Angeles fire losses could reach $30 billion for insurers

    www.aol.com/los-angeles-fire-losses-could...

    Multiple fires raging across the Los Angeles area will cost insurers as much as $30 billion, Wells Fargo and Goldman Sachs estimated in a report released this week. The ongoing fires, according to ...

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