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Do-It-Yourself (DIY) Question & Answer Forum
MCB breaker keeps tripping
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<blockquote data-quote="Doc Hudson" data-source="post: 485607" data-attributes="member: 1607"><p>The purpose of the overload protective device (fuse / MCB) is to protect the cable. You do not just go increasing fuse rating without ensuring the cable capacity is adequate. Didn't you discuss your requirements with who-ever replaced the fuse box? As these are very basic design considerations when selecting the appropriate cables &amp; circuit breakers required for your expected loads. (of course some builders/DIY'ers/wannabe electricians sometimes just by a cheap pre-loaded consumer unit from B&amp;Q, then try and fit whatever circuits are there onto the nearest value without doing any correct design calculations). A 'C' type breaker may be adequate but earth loop impedance would need to be verified. As a general rule of thumb upgrading a protective device is normally above the knowledge of the average DIY person as they lack correct test equipment.</p><p></p><p>Doc H. </p></blockquote><p></p>
[QUOTE="Doc Hudson, post: 485607, member: 1607"] The purpose of the overload protective device (fuse / MCB) is to protect the cable. You do not just go increasing fuse rating without ensuring the cable capacity is adequate. Didn't you discuss your requirements with who-ever replaced the fuse box? As these are very basic design considerations when selecting the appropriate cables & circuit breakers required for your expected loads. (of course some builders/DIY'ers/wannabe electricians sometimes just by a cheap pre-loaded consumer unit from B&Q, then try and fit whatever circuits are there onto the nearest value without doing any correct design calculations). A 'C' type breaker may be adequate but earth loop impedance would need to be verified. As a general rule of thumb upgrading a protective device is normally above the knowledge of the average DIY person as they lack correct test equipment. Doc H. [/QUOTE]
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MCB breaker keeps tripping
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