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RCD Testing with Residual Current Devices from Austest & Co

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Austest & Co , a specialist provider of electrical testing and tagging services offers RCD testing services for residual current devices.  

Residual current devices are a range of circuit breakers designed to disconnect a circuit whenever an abnormality is detected in the electrical current flow.  

Residual current devices or RCDs can detect when the electrical current is unbalanced between the active energised conductor and neutral down to earth or persons. This may be caused by a current leakage through the body of a person who accidentally touches the energised part of the circuit potentially causing a lethal shock.  

RCDs are designed to disconnect the electrical current supply quickly to reduce the harm caused by such shocks although they are not intended to provide protection against short circuit conditions.

Main circuit breakers/ residual current devices (MCB/RCD) are combination circuit breakers that not only detect earth leakage but also detect short circuits between active and neutral in addition to providing strict overload protection.  

MCB/RCD circuit breakers are considered the standard presently and should be used in most conditions.

RCD testing is a mandatory requirement to ensure safety. All RCDs must be trip tested on monthly, quarterly or annual intervals. Regular RCD testing is required if the MCB/RCD is located in a wet, dusty, corrosive or harsh environment.  

Austest will replace any MCB/RCD if it fails the trip testing by not tripping within 30 ms.  

MCB/RCDs are primarily available in two types: the 30 ms circuit breakers and the 10 ms circuit breakers.  

The 30-millisecond circuit breakers trip within thirty-thousandths of a second while the 10 ms circuit breakers trip within ten-thousandths of a second. The 10 ms breakers are designed for people with heart pacemakers in the home or work environment to prevent any damage to the pacemaker circuitry.

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