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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 ...
[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]
In a 3 phase circuit all current carrying conductors must be sensed. In modern literature the term ELCB is sometimes incorrectly used to specifically refer to VO-ELCBs, while almost never used to refer to current sensing devices, which are almost exclusively referred to instead by terms such as RCD, RCCB and GFCI.
3–5 times rated current I n, e.g. a nominally 10 A device will trip at 30–50 A C 5–10 times I n: D 10–14 times I n: K 8–12 times I n. For the protection of loads that cause frequent short-duration (approximately 400 ms to 2 s) current peaks in normal operation Z 2–3 times I n for durations on the order of tens of seconds.
Three-phase transformer with four-wire output for 208Y/120 volt service: one wire for neutral, others for A, B and C phases. Three-phase electric power (abbreviated 3ϕ [1]) is a common type of alternating current (AC) used in electricity generation, transmission, and distribution. [2]
This can be a hazard because the neutral wire is a current-carrying conductor, which means the exposed casing can become energized. [2] In addition, a fault condition to a bootleg ground will not trip a GFCI breaker, nor protect a receptacle that is wired from the load side of a GFCI receptacle.
Failure to install a "feed-through" type GFCI to all electrical devices that are an integral part of a Swimming pool, or not testing it weekly. This is a particular concern due to the use of electric lights and pumps where persons are immersed in water. The GFCI has the typical "test" and "reset" buttons, but no plug-in outlets.
Loose connections, which can develop over time, can sometimes become hot enough to ignite house fires. An AFCI selectively distinguishes between a harmless arc (incidental to normal operation of switches, plugs, and brushed motors), and a potentially dangerous arc (that can occur, for example, in a lamp cord which has a broken conductor).