A ground fault circuit interrupter or rcd trips when the is leakage current to ground
In no fault condition the active and neutral conductor emf's cancel each other out in ground fault condition the emf's become unbalanced resulting in a small voltage being inducted into a toroidal coil which activates a internal trip relay resulting in disconnection of supply domestic rcd's are generaly set to trip at 30ma to ground
A "GFCI" is a ground fault circuit interrupter. For more information see the link below.
In North America they are known as a GFCI. Ground Fault Circuit Interrupter breaker.
GFCI = Ground Fault Circuit Interrupter.
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The first definition, by the electrical code, covers it perfectly.
Definicion of Ground fault Circuit Interrupter.
Ground-fault circuit interrupter.
A ground fault circuit interrupter or rcd trips when the is leakage current to ground In no fault condition the active and neutral conductor emf's cancel each other out in ground fault condition the emf's become unbalanced resulting in a small voltage being inducted into a toroidal coil which activates a internal trip relay resulting in disconnection of supply domestic rcd's are generaly set to trip at 30ma to ground
Ground Fault Circuit Interrupter (GFCI).
Proper name is GFCI (ground fault circuit interrupter). It could be a breaker or receptacle. It's used for wet location circuits, like bathrooms, kitchens, hot tubs, outdoor
There are tow places to put a Ground Fault Circuit Interrupter. There is a GFCI breaker which would be installed in a breaker box and a GFCI outlet that can be installed anywhere. Most GFCI outlets allow you to connect regular outlets to the GFCI and those outlets will also be protected.
== == If the current in an ac power circuit is not balanced between hot and neutral, possibly meaning some of the current is going through a human being to ground, a GFCI breaker or receptacle will break the circuit to keep the person from being electrocuted.