Why Does Your RCD Keep Tripping? 7 Causes You Need to Know

Why does an RCD keep tripping — even when everything seems to be working normally? In this video, we explain how an RCD (Residual Current Device) actually works, what the 30 mA rating means, why 40 A does not mean the same thing, and the difference between an RCCB and an RCBO. Then we look at 7 common reasons why an RCD may trip: damaged insulation, moisture, damaged cables, unwanted neutral-to-earth connections, accumulated leakage currents, wiring faults, and even a faulty RCD. You will also learn about RCD types AC, A, F and B, what the TEST button actually checks, why repeatedly resetting a tripping RCD is not a repair, and when professional electrical testing is necessary. An appliance can appear to work normally and still have an insulation or leakage-current problem. An RCD is designed to detect current that is no longer returning through the expected path. This video is for educational purposes only. Electrical installations can contain dangerous voltages. Testing, fault finding and repairs should be carried out by a qualified person using appropriate equipment. Subscribe for more clear electrical explanations, fault-finding videos and practical electrical engineering. 00:00 Why does an RCD trip? 00:46 How an RCD detects leakage current 02:18 30 mA vs 40 A — what do the ratings mean? 03:23 RCCB vs RCBO 04:43 RCD types AC, A, F and B 05:50 Cause 1 — Damaged insulation 06:13 Cause 2 — Moisture and water 06:36 Cause 3 — Damaged cable 06:47 Cause 4 — Neutral-to-earth connection 07:01 Cause 5 — Leakage currents add up 07:33 Cause 6 — Wiring fault 07:44 Cause 7 — Faulty RCD 08:19 What should you do when an RCD trips? 08:41 What does the TEST button actually test? 09:49 RCD myths and facts 10:36 Repeated resetting is not a repair 10:43 The principle to remember 10:57 Next episode #RCD #ElectricalSafety #Electrician