Where Would I Use a Time-Delayed RCD?

Time-delayed RCDs (or Type S RCDs) might sound like a contradiction as RCDs are supposed to trip instantly to keep people safe. 🤔 In this video, Joe Robinson demystifies time-delayed RCDs and explains why they’re essential for selectivity in certain electrical installations.

We'll cover:
✅ Why using an RCD with a time delay doesn't mean you're compromising on safety
✅ How selectivity between RCDs works according to BS 7671 Regulation 536.4.1.4
✅ The importance of the 3:1 ratio between upstream and downstream RCDs
✅ Why simply choosing a higher rating RCD without a time delay won't solve the problem

👉 Watch now to make sure your RCD installations are fully compliant and safe—and avoid unnecessary tripping that could bring down healthy circuits! 🔌

💡 Click the link to access our free training package and earn a CPD certificate! 📜 https://training.efixx.co.uk/course/a...

🛠️ Timestamps:
0:00 — Time-delayed RCDs — a contradiction?
0:18 — RCD misconceptions and what they’re really for
0:35 — Free training reminder — get your CPD certificate!
0:46 — Basic protection vs. fault protection
1:18 — Additional protection: protecting people and livestock
1:40 — RCDs in TT systems — why they matter
2:26 — RCBOs and the problem with sub-mains
2:49 — Selectivity problems with multiple RCDs
3:10 — BS 7671 Regulation 536.4.1.4 explained
3:51 — Time-delayed RCD (Type S) — what it does
4:15 — Why time delay alone isn’t enough
4:35 — The 3:1 ratio — why it matters
4:47 — 30mA vs. 100mA RCDs — don’t get caught out!
5:16 — Summary — meeting both requirements for selectivity
5:23 — Wrapping up — when you need a time-delayed RCD
5:35 — Training reminder — get your certificate 👉 https://training.efixx.co.uk/course/a...
5:47 — Next video 👉    • How Do I Pick the Right RCD for a Heat Pump?  

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