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  2. Square D - Wikipedia

    en.wikipedia.org/wiki/Square_D

    Square D is an American manufacturer of electrical equipment headquartered in Andover, Massachusetts. Square D is a flagship brand of Schneider Electric , which acquired the company in 1991. The company was listed on the New York Stock Exchange for 55 years prior to its acquisition without reporting financial loss in any calendar quarter ...

  3. Federal Pacific Electric Corporation - Wikipedia

    en.wikipedia.org/wiki/Federal_Pacific_Electric...

    1951: Begins marketing the Stab-Lok line of panels and breakers under the Federal Electric Products (FEP) name. [16] [17] Note: It is unclear whether Federal Pacific bought FEP, or was a name change, or a successor company. It appears to be a name change, with "Federal (Pacific) Electric Company" appearing as the name in several newspaper reports.

  4. Zinsco - Wikipedia

    en.wikipedia.org/wiki/Zinsco

    Although some companies, such as FPE and Square-D, continued to use an all-copper design, other manufacturers switched to an aluminum alloy for bus bars and breakers. Zinsco would remain with copper in both their panels and breakers until the third major copper shortage in the early 1960s, when they would switch to an aluminum bus.

  5. Telephone switchboard - Wikipedia

    en.wikipedia.org/wiki/Telephone_switchboard

    PBX switchboard, 1975. A telephone switchboard is a device used to connect circuits of telephones to establish telephone calls between users or other switchboards. The switchboard is an essential component of a manual telephone exchange, and is operated by switchboard operators who use electrical cords or switches to establish the connections.

  6. Panel switch - Wikipedia

    en.wikipedia.org/wiki/Panel_switch

    The line circuit consisted of a line relay on the originating side to indicate that a customer had gone off-hook, and a cutoff relay to keep the line relay from interfering with an established connection. The cutoff relay was controlled by a sleeve lead that, as with the multiple switchboard, could be activated by either the originating section ...

  7. Electric switchboard - Wikipedia

    en.wikipedia.org/wiki/Electric_switchboard

    A low-voltage switchboard A modern electric switchboard. An electric switchboard is a piece of equipment that distributes electric power from one or more sources of supply to several smaller load circuits. It is an assembly of one or more panels, each of which contains switching devices for the protection and control of circuits fed from the ...

  8. Distribution board - Wikipedia

    en.wikipedia.org/wiki/Distribution_board

    A distribution board (also known as panelboard, circuit breaker panel, breaker panel, electric panel, fuse box or DB box) is a component of an electricity supply system that divides an electrical power feed into subsidiary circuits while providing a protective fuse or circuit breaker for each circuit in a common enclosure.

  9. Telephone jack and plug - Wikipedia

    en.wikipedia.org/wiki/Telephone_jack_and_plug

    The cubic design was changed to a round version (No. 505A) in the mid 1960s. The four-prong jack and plug combination was the standard line connection for all portable telephone sets until the conversion to modular jacks in the 1970s, typified by the Registered Jack standards promulgated in U.S. federal law.

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