Electrical Inspection, Testing and Certification Practice Exam

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Where should RCD testing not be performed?

On the load side of the RCD
On the supply side of the RCD
On both sides of the RCD
Only on the distribution board

The correct answer is: On the supply side of the RCD

Testing Residual Current Devices (RCDs) on the supply side is not recommended. This is due to the risk of compromising the integrity of the RCD and potentially exposing the tester to live voltage conditions, which could create dangerous situations. RCDs are designed to detect and interrupt electrical faults, and testing should focus on the load side where the devices are meant to provide protection. By performing tests on the load side, you ensure that you are verifying the functionality of the RCD under the conditions it will typically encounter when protecting the circuit. This approach guarantees accurate testing results and maintains safety during the inspection process. While both the load side and distribution board may be valid testing points, the supply side remains off-limits for direct testing to prevent safety hazards and ensure proper RCD operation in real-world scenarios.