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Lighting Circuit - Part 2
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<blockquote data-quote="Evans Electric" data-source="post: 28573" data-attributes="member: 1408"><p>Hi Bob , The thing with the 100w lamp across the fuseway is you wont keep blowing fuses. So , in theory anyway, if you had all the switches off and the lamp is off , then the fault is not there at this point. If there is a fault between SW -N or SW - earth say, instead of the fuse blowing, the 100w lamp lights up because it has a circuit to flow round , either to N or to Earth. If the lamp is on all the time then, presuming the wiring is 3 plate , if you start to disc. the loop feeds to split it up and narrow it down.</p><p></p><p>The bulb wont blow because of its resistance, the filament will just light up because there is a return path down either the N or the E.</p><p></p><p>I think you are stuck with a process of elimination, you'll only find the first fitting by dissing all the others. Obviously if you dissed half the circuit you've narrowed it down to ,say 5 fittings,.</p><p></p><p>Re : Meggering tells you theres a fault but not where, same as the lamp, you still need to narrow it down.</p><p></p><p>DON'T FORGET THE NEUTRAL WILL READ TO EARTH IF YOU DON'T DISSC. IT IN THE BOARD!!</p><p></p><p>Deke</p></blockquote><p></p>
[QUOTE="Evans Electric, post: 28573, member: 1408"] Hi Bob , The thing with the 100w lamp across the fuseway is you wont keep blowing fuses. So , in theory anyway, if you had all the switches off and the lamp is off , then the fault is not there at this point. If there is a fault between SW -N or SW - earth say, instead of the fuse blowing, the 100w lamp lights up because it has a circuit to flow round , either to N or to Earth. If the lamp is on all the time then, presuming the wiring is 3 plate , if you start to disc. the loop feeds to split it up and narrow it down. The bulb wont blow because of its resistance, the filament will just light up because there is a return path down either the N or the E. I think you are stuck with a process of elimination, you'll only find the first fitting by dissing all the others. Obviously if you dissed half the circuit you've narrowed it down to ,say 5 fittings,. Re : Meggering tells you theres a fault but not where, same as the lamp, you still need to narrow it down. DON'T FORGET THE NEUTRAL WILL READ TO EARTH IF YOU DON'T DISSC. IT IN THE BOARD!! Deke [/QUOTE]
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Lighting Circuit - Part 2
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