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Student & Learning Zone - City & Guilds
Type d mcb
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<blockquote data-quote="Alanz1" data-source="post: 533197" data-attributes="member: 35523"><p>I now understand this much better.</p><p>Check you have the required current to trip an mcb within the appropriate time.</p><p>Chart lists each current required, in my example. 383 amps wouldn't trip the breaker, adding massive heat to cabling or worse, fire.</p><p></p><p>Many thanks to all who took the time to try explain in simple terms, how these charts worked and ohms law.</p><p></p><p>I stupidly assumed that Zs wasn't really a resistance reading as it included the whole property wiring and also the external wiring back to DNO transformer.</p><p></p><p>I think I'll hang around this forum as every day is a school day <img class="smilie smilie--emoji" loading="lazy" alt="👍" title="Thumbs up :thumbsup:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f44d.png" data-shortname=":thumbsup:" /></p></blockquote><p></p>
[QUOTE="Alanz1, post: 533197, member: 35523"] I now understand this much better. Check you have the required current to trip an mcb within the appropriate time. Chart lists each current required, in my example. 383 amps wouldn't trip the breaker, adding massive heat to cabling or worse, fire. Many thanks to all who took the time to try explain in simple terms, how these charts worked and ohms law. I stupidly assumed that Zs wasn't really a resistance reading as it included the whole property wiring and also the external wiring back to DNO transformer. I think I'll hang around this forum as every day is a school day 👍 [/QUOTE]
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