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In stage lighting for film and theater, this connector is sometimes informally known as PBG (Parallel Blade with Ground), U-ground, Edison or Hubbell, the name of a common manufacturer. [21] (The name "Hubbell" can be confusing as several different connectors share this name depending on the company, industry, and use.)
Hubbell had been one of the first to manufacture flush toggle switches for alternating current only. The first Safety Receptacle was designed and produced as were the original "grounding only" devices which helped to set the standards for the industry. And while Hubbell was busy on land, the company found new opportunities at sea.
In electrical engineering, a disconnector, disconnect switch or isolator switch is a type of switching device with visible contacts, ...
A camlock or cam-lock is an interchangeable electrical connector, often used in temporary electrical power production and distribution, predominantly in North America. [1] ...
Harvey Hubbell patented a parallel blade plug in 1913, where the blades were equal width (U.S. patent 1,064,833). In 1916 Hubbell received a patent for a polarised version where one blade was both longer and wider than the other ( U.S. patent 1,180,648 ), in the polarised version of NEMA 1-15, introduced in the 1950s, both blades are the same ...
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 ...
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