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Student & Learning Zone - City & Guilds
Mock exam question
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<blockquote data-quote="rich1" data-source="post: 555861" data-attributes="member: 35020"><p>Not entirely sure what they are getting at with this question:</p><p></p><p><em>A circuit has been poorly desgined for selectivity between an appliance fuse and a MCB protecting the entire final circuit. </em></p><p><em></em></p><p><em>What is the most likely outcome should a single fault occur on the appliance?</em></p><p><em></em></p><p><em>a: A fault would disconnect the appliance fuse only.</em></p><p><em>b: A fault would cause the loss of all equipment on the circuit.</em></p><p><em>c: A fault would cause no loss of any equipement.</em></p><p><em>d: A fault would cause the entire supply system to disconnect.</em></p><p></p><p>I assume they mean that the fuse sizing and MCB rating are at odds with each other? Not sure which way though. Fuse rating higher than MCB? Or fuse and MCB rating that allows a fault condition to occur without either the fuse of MCB blowing/opening?</p><p>Does 'Loss of all equipment' mean loss of power or permanent loss of the equipment - as in going bang?</p><p></p><p>It doesn't say what sort of fault either.</p></blockquote><p></p>
[QUOTE="rich1, post: 555861, member: 35020"] Not entirely sure what they are getting at with this question: [I]A circuit has been poorly desgined for selectivity between an appliance fuse and a MCB protecting the entire final circuit. What is the most likely outcome should a single fault occur on the appliance? a: A fault would disconnect the appliance fuse only. b: A fault would cause the loss of all equipment on the circuit. c: A fault would cause no loss of any equipement. d: A fault would cause the entire supply system to disconnect.[/I] I assume they mean that the fuse sizing and MCB rating are at odds with each other? Not sure which way though. Fuse rating higher than MCB? Or fuse and MCB rating that allows a fault condition to occur without either the fuse of MCB blowing/opening? Does 'Loss of all equipment' mean loss of power or permanent loss of the equipment - as in going bang? It doesn't say what sort of fault either. [/QUOTE]
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