In this Q&A video, we explore how adding an RCD impacts Earth Fault Loop Impedance and overall circuit design. You'll learn:
✅ Why certain circuits require RCD protection under BS7671 regulations.
✅ How RCDs change the maximum permissible Earth Fault Loop Impedance.
✅ Practical implications of using RCDs, including volt drop and fault current considerations.
✅ Why overcurrent protection remains essential, even with RCDs in place.
Using a 9 kW Fusion Comet electric boiler as a real-world example, we dive into how RCDs provide additional protection and how to account for them in your electrical designs.
This video is part of our electrical design training series in collaboration with BG Electrical.
Further Electrical Design training 👉 https://training.efixx.co.uk/course/further-electrical-design-in-association-with-bg-electrical
Missed part one? Start here 👉 https://training.efixx.co.uk/course/introduction-to-electrical-design-cpd-in-association-with-bg-electrical
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Time Stamps ⏱
00:00 How do RCDs effect earth fault loop impedance?
00:45 Do we need an RCD?
06:00 How RCDs can change previous calculations
09:00 Circuits are affected by more than one type of fault current
09:45 Protecting our circuit against all faults
10:47 Validate your learning!
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#electricaldesign #electricalinstallation #electricians