AM2S - Section C: Safe Isolation - Incoming Supply to 3 Phase Distribution Board from Main Switch

Safe Isolation of a Three-Phase Distribution Board | AM2S Assessment Guide Safe isolation is one of the most important practical skills every electrician must master, and it's a key requirement of the AM2S End Point Assessment. In this video, we take you through the complete safe isolation procedure for a three-phase distribution board, demonstrating each stage exactly as it should be carried out in a workshop training environment. The tutorial begins by explaining the importance of obtaining permission from the duty holder before isolating an electrical installation. You'll then learn how to correctly operate the main switch, fit an approved lock-off device, attach a warning tag, and securely retain the unique key to ensure the installation cannot be accidentally re-energised. The video also covers selecting the correct test equipment, explaining why a GS38-compliant voltage indicator is essential. You'll see the features that make a tester suitable for safe isolation, including finger guards, insulated probes, correct voltage ratings, and limited exposed probe tips, along with examples of equipment that should not be used. To ensure safe working practices, the demonstration shows how to prove the voltage indicator using a proving unit before testing, carry out the full ten voltage tests required to confirm a three-phase distribution board is dead, and finally re-prove the tester after testing has been completed. Throughout the tutorial, practical assessment tips are provided to help apprentices avoid common mistakes during the AM2S assessment, including an easy method for remembering all ten required tests. The video also explains the difference between isolating a newly installed distribution board and one that is already in service, highlighting the additional requirement to isolate all outgoing circuits before switching off the main switch on a live installation. Whether you're preparing for your AM2S assessment, studying electrical installation, or simply refreshing your knowledge of industry best practice, this step-by-step guide will help you develop safe working habits that comply with current guidance. ⚠️ Please note: All practical demonstrations are carried out in a controlled teaching environment. Apprentices and training staff wear the appropriate PPE at all times. If you found this video helpful, don't forget to Like, Subscribe, and turn on notifications for more electrical installation training videos, AM2S preparation guides, testing procedures, and practical demonstrations. #Electrician #AM2S #SafeIsolation #ThreePhase #ElectricalInstallation #ElectricalTraining #ApprenticeElectrician #LockOff #GS38 #VoltageTesting #ElectricalSafety #DistributionBoard #CityAndGuilds #NVQ #InspectionAndTesting #ElectricalEngineering