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Student & Learning Zone - City & Guilds
Type d mcb
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<blockquote data-quote="Alanz1" data-source="post: 532913" data-attributes="member: 35523"><p>Hi</p><p>Firstly, I am not a spark, merely mechanically qualified to trade, struggling with an electrical question at college.</p><p></p><p>Could anyone assist with this question ?.</p><p></p><p>A 230vac circuit with a Zs of 0.6 ohms on a TN system.</p><p>5kw load/25 amp type D MCB.</p><p>Would a 0.4ms be possible ?.</p><p></p><p>I have used</p><p>25x20 =500</p><p>230/500=0.46</p><p>0 46x0.8 = 0.368</p><p></p><p>To me the answer may be yes as 0.368 is less than 0.4 seconds, but I'm a bit lost.</p><p></p><p>I don't understand the tables showing 0.4/5s trip times for type D mcbs.</p><p></p><p>even more confusing is there are different figures used on the 2 tables below.</p><p></p><p>[ATTACH=full]14113[/ATTACH]</p><p></p><p></p><p>[ATTACH=full]14114[/ATTACH]</p><p></p><p></p><p></p><p></p><p></p><p></p><p>Can anyone help out ?.</p><p></p><p>Many thanks.</p></blockquote><p></p>
[QUOTE="Alanz1, post: 532913, member: 35523"] Hi Firstly, I am not a spark, merely mechanically qualified to trade, struggling with an electrical question at college. Could anyone assist with this question ?. A 230vac circuit with a Zs of 0.6 ohms on a TN system. 5kw load/25 amp type D MCB. Would a 0.4ms be possible ?. I have used 25x20 =500 230/500=0.46 0 46x0.8 = 0.368 To me the answer may be yes as 0.368 is less than 0.4 seconds, but I'm a bit lost. I don't understand the tables showing 0.4/5s trip times for type D mcbs. even more confusing is there are different figures used on the 2 tables below. [ATTACH type="full" width="606px"]14113[/ATTACH] [ATTACH type="full" width="616px"]14114[/ATTACH] Can anyone help out ?. Many thanks. [/QUOTE]
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