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Residual-current device
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===Sensitivity=== RCD sensitivity is expressed as the rated residual operating current, noted ''I<sub>Ξn</sub>''. Preferred values have been defined by the IEC, thus making it possible to divide RCDs into three groups according to their ''I<sub>Ξn</sub>'' value: * High sensitivity: 5, 10 and 30{{nbsp}}mA (for direct-contact or life injury protection), * Medium sensitivity: 100, 300, 500 and 1000{{nbsp}}mA (for fire protection), * Low sensitivity: 3, 10 and 30{{nbsp}}A (typically for protection of machines). The 5{{nbsp}}mA sensitivity is typical for GFCI outlets.
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