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Do-It-Yourself (DIY) Question & Answer Forum
32a breaker to a 40a breaker
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 503074" data-attributes="member: 250"><p>The MCB's ( aka fuses / breakers ) are there to protect the cable.....</p><p></p><p>Laws of physics..</p><p></p><p>Electricity ALWAYS generates heat whilst travelling along a cable...</p><p></p><p>More power = More current = More heat...</p><p></p><p>The cables in the circuit MUST be capable of carrying the maximum current that the MCB/Fuse/Breaker will allow to flow..</p><p></p><p>i.e. in the event of a fault the weakest link MUST NOT be the cable!!!</p><p></p><p>otherwise cables will overheat / melt / start fire / be significantly damaged...</p><p></p><p>If an MCB is tripping 99.9999% of the time they are doing their job correctly...</p><p></p><p>and the solution is to correctly identify and resolve the problem.... </p><p></p><p>Changing the fuse rating is not normally the correct solution..</p><p></p><p>Unless you have proved 100% that the cable is capable of carrying any new current ratings that a different MCB/Fuse/Breaker will allow to flow..</p><p></p><p>An "incorrect fix" may make something appear to work... "for a while"...</p><p></p><p>But a few hours... days... weeks or months later the true implications of incorrect protection on a circuit may become a very expensive solution!</p><p></p><p>Electrical circuits must be designed to "Fail Safe" ... Not just work!!!</p><p></p><p>I doubt I would be looking at increasing the rating above 32A</p><p></p><p> Guinness </p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 503074, member: 250"] The MCB's ( aka fuses / breakers ) are there to protect the cable..... Laws of physics.. Electricity ALWAYS generates heat whilst travelling along a cable... More power = More current = More heat... The cables in the circuit MUST be capable of carrying the maximum current that the MCB/Fuse/Breaker will allow to flow.. i.e. in the event of a fault the weakest link MUST NOT be the cable!!! otherwise cables will overheat / melt / start fire / be significantly damaged... If an MCB is tripping 99.9999% of the time they are doing their job correctly... and the solution is to correctly identify and resolve the problem.... Changing the fuse rating is not normally the correct solution.. Unless you have proved 100% that the cable is capable of carrying any new current ratings that a different MCB/Fuse/Breaker will allow to flow.. An "incorrect fix" may make something appear to work... "for a while"... But a few hours... days... weeks or months later the true implications of incorrect protection on a circuit may become a very expensive solution! Electrical circuits must be designed to "Fail Safe" ... Not just work!!! I doubt I would be looking at increasing the rating above 32A Guinness [/QUOTE]
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32a breaker to a 40a breaker
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