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Do-It-Yourself (DIY) Question & Answer Forum
Swapping an MCB on a Hager Consumer Unit
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<blockquote data-quote="Doc Hudson" data-source="post: 415929" data-attributes="member: 1607"><p>From your first line you appear to be missing the point that an MCB is not chosen because of the load. The MCB is chosen for the cable. It is the cable that is selected for the load taking into account the de-rating factors due to its method of installation. If the existing cable is 10.0mm and its a new build with insulation all over the place, there could be a problem if you opt for 50A MCB. Table F6 in the on-site-guide recommends that 10.0mm flat Twin &amp; Earth has a capacity ranging from 32A to 64A dependent upon the installation method. It is quite possible you may need a 16.0mm cable to safely supply a 10.8kw shower. That is of course if you genuinely want to adopt the safest methods and comply with the guidance in the wiring regulations. You will also need to redo the maximum demand calculations for the installation if you are fitting two 10.8kw showers. Your query is simple and the simple answers have been provided. Just swapping the MCB without the relevant calculations and tests is not the safest method. Nor is it advisable to do as a DIY Project. </p><p></p><p>Doc H.</p></blockquote><p></p>
[QUOTE="Doc Hudson, post: 415929, member: 1607"] From your first line you appear to be missing the point that an MCB is not chosen because of the load. The MCB is chosen for the cable. It is the cable that is selected for the load taking into account the de-rating factors due to its method of installation. If the existing cable is 10.0mm and its a new build with insulation all over the place, there could be a problem if you opt for 50A MCB. Table F6 in the on-site-guide recommends that 10.0mm flat Twin & Earth has a capacity ranging from 32A to 64A dependent upon the installation method. It is quite possible you may need a 16.0mm cable to safely supply a 10.8kw shower. That is of course if you genuinely want to adopt the safest methods and comply with the guidance in the wiring regulations. You will also need to redo the maximum demand calculations for the installation if you are fitting two 10.8kw showers. Your query is simple and the simple answers have been provided. Just swapping the MCB without the relevant calculations and tests is not the safest method. Nor is it advisable to do as a DIY Project. Doc H. [/QUOTE]
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Swapping an MCB on a Hager Consumer Unit
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