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Do-It-Yourself (DIY) Question & Answer Forum
What Amp fuse for replacement shower and new bathroom light?
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<blockquote data-quote="Geoff1946" data-source="post: 524042" data-attributes="member: 28452"><p>The reason fuses have been superseded on domestic circuits is because they are no good at overload protection. They are good at short circuit protection, blowing quickly on the massive overload such a fault causes, but as you have demonstrated don't break on moderate overload, leaving the other circuit components to overheating, etc.</p><p>Miniature circuit breakers, (MCB), conversely. will break an overload current much more quickly than a fuse, but are vulnerable to permanent damage if repeatedly short circuited. They are the base standard for domestic boards for at least the past forty years.</p><p>RCDs, which I fear you may lack, detect small currents leaking to earth which if greater could harm, (kill!) a person. I personally would not use a shower which didn't have one. They can be combined with an MCB when they are designated an RCBO.</p><p>Please don't use the advice in this string to go and buy a 40 amp fuse for your antique Wylex board!</p></blockquote><p></p>
[QUOTE="Geoff1946, post: 524042, member: 28452"] The reason fuses have been superseded on domestic circuits is because they are no good at overload protection. They are good at short circuit protection, blowing quickly on the massive overload such a fault causes, but as you have demonstrated don't break on moderate overload, leaving the other circuit components to overheating, etc. Miniature circuit breakers, (MCB), conversely. will break an overload current much more quickly than a fuse, but are vulnerable to permanent damage if repeatedly short circuited. They are the base standard for domestic boards for at least the past forty years. RCDs, which I fear you may lack, detect small currents leaking to earth which if greater could harm, (kill!) a person. I personally would not use a shower which didn't have one. They can be combined with an MCB when they are designated an RCBO. Please don't use the advice in this string to go and buy a 40 amp fuse for your antique Wylex board! [/QUOTE]
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What Amp fuse for replacement shower and new bathroom light?
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