Types of RCDs
An RCD can save lives. RCDs will prevent electrocution by cutting the power to a circuit in the event of earth leakage.
Following are descriptions and images of devices including RCDs, circuit breakers, combination RCD and circuit breaker, portable RCDs, and powerpoint RCDs.
An RCD is a safety device that prevents electrocution by cutting the electricity supply immediately. It works on the principle that the electricity flowing into a circuit must be equal to the current flowing out of a circuit. When you receive a shock it means an electrical current has passed through the body directly to earth.
RCDs are fitted at the meter box and will have a test button on them. If you press the ‘test’ button or the RCD has detected an issue, the on/off switch will go to the ‘off’ position.
A minimum of two RCDs are required to ensure some light and power remains if one operates. Two RCDs also reduces the possibility of tripping due to some appliances which have low levels of earth leakage.
Power point RCDs
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