RCD (Residual Current Device / RCCB ( Residual Current Circuit - TopicsExpress

RCD (Residual Current Device / RCCB ( Residual Current Circuit Breaker) Phase ( line) and Neutral both wires connected through RCD. It trips the circuit when there is earth fault current. The amount of current flows through the phase ( line) should return through neutral . It detects by RCD. any mismatch between two currents flowing through phase and neutral detect by - RCD and trip the circuit within 30 Miliseconed. If a house has an earth system connected to an earth rod and not the main incoming cable , then it must have all circuits protected by an RCD ( because u mite not be able to get enough fault current to trip a MCB) RCDs are an extremely effective form of shock protection The most widely used are 30 mA ( milliamp ) and 100 mA devices. A current flow of 30 mA ( or 0 .03 amps ) is sufficiently small that it makes it very difficult to receive a dangerous shock. Even 100 mA is a relatively small figure when compared to the current that may flow in an earth fault without such protection (hundred of amps )

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