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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 ...
To address this the IEC introduced the term residual current device (RCD). Residual current refers to any residue when comparing current in the outbound and return currents in the circuit. In single phase circuits this is simply the line or phase current minus the neutral current. In a 3 phase circuit all current carrying conductors must be sensed.
Zero-point quenching (contacts open at the moment in the AC waveform at which the current and potential are near zero, effectively breaking no load current at the time of opening. The zero-crossing occurs at twice the line frequency; i.e., 100 times per second for 50 Hz and 120 times per second for 60 Hz AC.)
The numerals following the hyphen is the current rating of the device in amperes. This number is followed by the letter 'R' to indicate a receptacle (socket) or 'P' to indicate a plug (prongs). As an example, the 5-15R is the common 125 V two-pole, three-wire receptacle rated for 15 A.
A circuit protective device that opens on excess current, and then, on cooling off, restores the circuit automatically. residual current circuit breaker A circuit breaker that detects unbalance of phase currents due to ground fault. resistive circuit A circuit containing resistive elements only, no capacitors or inductors. resistivity
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Speed: Devices must function quickly to reduce equipment damage and fault duration, with only very precise intentional time delays. Sensitivity: Devices must detect even the smallest value of faults and respond. Economy: Devices must provide maximum protection at minimum cost. Simplicity: Devices must minimize protection circuitry and equipment.
An outlet is defined by the NEC as "a point in the wiring system at which current is taken to utilization equipment". [1] This definition includes receptacles, lighting, motors, etc. Ordinary switches control but do not consume electricity, and therefore are not defined as outlets in this sense.