AM2S - Section B: Live Tests: RCD Tests

In this practical electrical training video, you'll learn how to correctly carry out RCBO/RCD testing on a ring final circuit using a multifunction installation tester. Filmed in a teaching workshop, this demonstration follows safe working practices and explains both the testing procedure and how to correctly interpret the results. The video begins by discussing why it's safer to perform RCD testing from a socket outlet rather than directly at the consumer unit, reducing the need to work inside live electrical equipment. You'll then be guided through setting up the test instrument for a 30mA RCBO, selecting the appropriate test options, and understanding the purpose of each test. Topics covered include: Safe preparation before carrying out live testing. Selecting the correct RCD rating on the multifunction tester. Understanding the difference between ½ × IΔn (half-times) and 1 × IΔn (full-times) RCD tests. Why the 5 × test is no longer required under BS 7671:2018 Amendment 2 for standard RCD testing. Using the Auto Test function and understanding the sequence of tests performed. Carrying out tests at both 0° and 180° of the AC sine wave. Resetting the RCBO during the testing process. Reading and interpreting disconnection times recorded by the tester. Understanding why the half-times test should not trip the device. Identifying which recorded disconnection time should be entered onto inspection and testing documentation. Completing the required functional test using the built-in test button on the RCBO. The video also explains why the highest measured disconnection time from the one-times tests is the value that should be recorded and demonstrates the final functional operation of the protective device before completing the certification paperwork. Whether you're an electrical apprentice, trainee electrician, college student, or a qualified electrician looking to refresh your inspection and testing knowledge, this tutorial provides a clear, practical demonstration of RCBO/RCD testing in accordance with current UK wiring regulations. If you found this video helpful, don't forget to Like, Subscribe, and turn on notifications for more electrical installation, inspection and testing, and practical training videos. #Electrical #Electrician #InspectionAndTesting #RCDTesting #RCBO #18thEdition #BS7671 #ElectricalTraining #MultifunctionTester #RingFinalCircuit #ConsumerUnit #ElectricalInstallation #ApprenticeElectrician #ElectricalEngineering #TradeSkills #CityAndGuilds #NVQ #AM2 #ElectricalSafety #UKElectrician