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
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