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2. Electrical wiring in North America - Wikipedia

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

   The most common three-phase system will have three hot legs, 208 V to each other and 120 V each to the neutral. An older, but still widely used, high-leg delta system uses three phases with 240 volts phase-to-phase for motor loads, and 120 volts for lighting loads by use of a center-tapped transformer; two of the phases are 120 volts to neutral ...

3. Electric power distribution - Wikipedia

   en.wikipedia.org/wiki/Electric_power_distribution

   Most of the Americas use 60 Hz AC, the 120/240 volt split-phase system domestically and three phase for larger installations. North American transformers usually power homes at 240 volts, similar to Europe's 230 volts. It is the split-phase that allows use of 120 volts in the home. Japan's utility frequencies are 50 Hz and 60 Hz.

4. National Electrical Code - Wikipedia

   en.wikipedia.org/wiki/National_Electrical_Code

   A 120 volt combination AFCI/GFCI receptacle. Unlike circuit breakers and fuses, which only open the circuit when the current exceeds a fixed value for a fixed time, a GFCI device will interrupt electrical service when more than 4 to 6 milliamperes of current in either conductor leaks to ground.

5. Service drop - Wikipedia

   en.wikipedia.org/wiki/Service_drop

   From there they pass through the wall of the house to the electric panel and Main Fuses or Circuit Breakers inside. In North America, the 120/240 V split phase system is used for residential service drops. [3] [4] A pole-mounted single phase distribution transformer usually provides power for one or two residences. The secondary winding of the ...

6. Electrical wiring in the United Kingdom - Wikipedia

   en.wikipedia.org/wiki/Electrical_wiring_in_the...

   Residual-current device (RCD), also residual current circuit breaker (RCCB) A circuit breaker triggered by unequal currents in line and neutral wires (i.e., electrical power is passing to earth). Mandatory for most circuits as of 17th Edition regulations. Residual current circuit breaker with overcurrent protection (RCBO)

7. Circuit breaker - Wikipedia

   en.wikipedia.org/wiki/Circuit_breaker

   A circuit breaker is an electrical safety device designed ... voltage switch gear to 38 000 volts. Air circuit breakers may use ... and cost concerns ...