There is a misconception that circuits protected by an RCD mean you cannot receive a shock should an electrical appliance have a defect or failure. The reason this is incorrect is because an RCD will only operate AFTER a fault occurs. This fault could be a short circuit in the appliance due to damage or a component failure, or due to someone receiving an electrical shock. In all instances the RCD will only disconnect power after the event. This reduces the duration if the fault and in the case of an electrocution allows others to render assistance. It is logical then that all RCD's are periodically tested to ensure they operate correctly. Did you know there are different types of RCD for different applications.
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