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Do-It-Yourself (DIY) Question & Answer Forum
Sizing a Circuit Breaker
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 556768" data-attributes="member: 250"><p>How do you think that the heater would be damaged?</p><p>MCB's are not used to protect appliances/loads.</p><p></p><p>Any appliance or load would typically have its own internal overload protection and/or a plug-top/fused spur overload protective fuse..</p><p></p><p>No different to our 5A boiler supply connected to a 32A 2.5mm T&E ring circuit..</p><p>the 32A MCB or the supply cable will not cause damage to the boiler.</p><p></p><p>The 130m 2.5mm cable could be protected by any MCB up-to 10A type B...</p><p>but if going to 16A and above, you start exceeding the max permitted earth loop impedance 80% rule of thumb.</p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 556768, member: 250"] How do you think that the heater would be damaged? MCB's are not used to protect appliances/loads. Any appliance or load would typically have its own internal overload protection and/or a plug-top/fused spur overload protective fuse.. No different to our 5A boiler supply connected to a 32A 2.5mm T&E ring circuit.. the 32A MCB or the supply cable will not cause damage to the boiler. The 130m 2.5mm cable could be protected by any MCB up-to 10A type B... but if going to 16A and above, you start exceeding the max permitted earth loop impedance 80% rule of thumb. [/QUOTE]
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