Safety Switches Perth

August 9, 2014
1. What is an RCD and how does it work?
An RCD is a safety device that monitors electrical current flowing within a circuit from the meter box or distribution board. It works on the principle that the electricity current flowing in must be equal to the current flowing out of the circuit.
If the RCD detects an imbalance in the electrical current, indicating a leakage to earth, e.g. current flows through someone’s body to earth, the RCD immediately cuts the electricity supply to prevent electrocution.
RCDs are extremely sensitive, disconnecting within 10 to 50 milliseconds of detecting a leakage current. This is usually set at 30 milliamps for homes but may be less in other situations, such as hospitals.

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