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Residual current as in a residual current device or RCD (sometimes known as a earth leakage detector), refers to the current both entering and leaving a circuit. If more current flows into a circuit then comes out (if there is a ground fault or if someone gets a shock) the RCD will switch off the circuit. Typically the current required to trip a RCD is around 5-20mA, however even 5 mA can be enough to stop your heart, so RCDs are a good safety device but should not be relied on.

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14y ago

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