RCD test (Safety switch or ELCB)

RCDs are used to promote safety, providing an additional defence against electric shock as they are more sensitive than a normal fuse or circuit breaker.

RCDs monitor the level of electrical current within a circuit. At any stage when the RCD detects a peculiarity, it will instantaneously cut off the circuit. RCDs save many lives and prevent injuries, so it is necessary to ensure they are working properly at all times. This is where RCD testing comes into play. There are different types of RCDs and they are all subject to the same RCD tests.

• push button test – will ensure the RCD will trip when required.
• time test – which simulates a current leakage fault to measure the time taken to trip or ‘cut-off’ the current.

The regular maintenance program is set out in Australian Standards AS/NZS 3760 In-service safety inspection and testing of electrical equipment and RCD’s.