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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 that interrupts an electrical circuit when the current passing through a conductor is not equal and opposite in both directions, therefore indicating leakage current to ground or current flowing to another powered conductor.

3. Zinsco - Wikipedia

   en.wikipedia.org/wiki/Zinsco

   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. In 1963, Zinsco introduced the R-38 twin breaker, which was the only twin circuit breaker that also made contact on both bus-bars for 240 volts in a single breaker space.

4. Circuit breaker - Wikipedia

   en.wikipedia.org/wiki/Circuit_breaker

   Three single-phase Soviet/Russian 110-kV oil circuit breakers 400 kV SF 6 live-tank circuit breakers Electrical power transmission networks are protected and controlled by high-voltage breakers. The definition of high voltage varies but in power transmission work is usually thought to be 72.5 kV or higher, according to a recent definition by ...

5. Three-prong adaptor - Wikipedia

   en.wikipedia.org/wiki/Three-prong_adaptor

   [2] [3] These adapters are illegal in some jurisdictions, in particular throughout Canada. [4] A safer and more reliable alternative identified in the US and Canadian electrical codes is to replace the outlet with a Ground Fault Circuit Interrupter (GFCI) breaker outlet. [3] Cheater plugs are also used to break ground loops in audio systems. [5]

6. 2.2 million Siemens and Murray circuit breakers recalled - AOL

   www.aol.com/news/2010-09-23-2-2-million-siemens...

   About 2.2 million Siemens and Murray circuit breakers are being recalled over concerns a spring clip can break and cause the breakers to fail, the U.S. Consumer Product Safety Commission said.

7. High-leg delta - Wikipedia

   en.wikipedia.org/wiki/High-leg_delta

   Even when unmarked, it is generally easy to identify this type of system, because the B phase (circuits #3 and #4) and every third circuit afterwards will be either a three-pole breaker or a blank. Current practice is to give separate services for single-phase and three-phase loads, e.g., 120 V split-phase (lighting etc.) and 240 V to 600 V ...