Residual current device

Residual current device

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Caption: Residual current device (RCD) of 63 amps with a 100mA tripping current. An RCD is an electric switch that cuts the electricity supply to a device when a fault develops. They are also known as earth leakage circuit breakers (ELCB). Many electric devices, especially gardening equipment, have plastic casings and therefore no earth wires. The lack of an earth wire means there is no path for electricity to flow should the device become live, for example if the power cord is severed. The RCD works by continually measuring the live and neutral current flows, which should be equal, and as soon as a difference occurs the electricity is shut off in under 40 milliseconds.

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Keywords: 63 amp, britain, british, device, earth leakage circuit breaker, elcb, electric, electrical, electricity, energy, equipment, garden, gardener, gardening, hedge trimmer, industry, physics, plug, plugged, protection, rcd, residual current device, technology

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