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  2. Generator interlock kit - Wikipedia

    en.wikipedia.org/wiki/Generator_Interlock_Kit

    It is a less-expensive alternative to purchasing and installing a dedicated transfer switch. The kit achieves the same function by adding an external interlock onto an existing breaker panel that allows the main breaker to be turned on or one designated load breaker to be turned on, but not both at the same time. The interlocked load breaker is ...

  3. Square D - Wikipedia

    en.wikipedia.org/wiki/Square_D

    Consequently, the company trademarked the logo and in 1917 they renamed the company Square D. Horton served as Square D's president until 1928 In the early 1920s Square D sold the majority of their fuse business in order to focus more on their safety switches and other safety products; advertisements with the tagline "Jones is Dead!" directed ...

  4. NEMA connector - Wikipedia

    en.wikipedia.org/wiki/NEMA_connector

    The National Electrical Code has been updated for 2014 to address the use of Outlet Branch Circuit (OBC) Arc Fault Circuit Interrupter (AFCI) receptacles as an alternative to traditional circuit breakers when used for modifications, extensions, replacement receptacles, or in new construction.

  5. Class-4 telephone switch - Wikipedia

    en.wikipedia.org/wiki/Class-4_telephone_switch

    A class-4 switch that connects class-5 switches to each other, but not to the long-distance network, is called a "local tandem." The majority of class-4 switches in the Bell System during the 1950s and 1960s used crossbar switches, such as the Crossbar Tandem (XBT) variant of the Number One Crossbar Switching System, or 1XB switch.

  6. Tandem Computers - Wikipedia

    en.wikipedia.org/wiki/Tandem_Computers

    Tandem Computers was founded in 1974 by James Treybig.Treybig first saw the market need for fault tolerance in OLTP (online transaction processing) systems while running a marketing team for Hewlett-Packard 's HP 3000 computer division, but HP was not interested in developing for this niche.

  7. Trapped-key interlocking - Wikipedia

    en.wikipedia.org/wiki/Trapped-key_interlocking

    The key can then be used to unlock the kiln door. While the key is removed from the switch interlock, a plunger from the interlock mechanically prevents the power switch from being turned on. Power cannot be re-applied to the kiln until the kiln door is locked, releasing the key, and the key is then returned to the power switch interlock. [5]

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