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<blockquote data-quote="apprentice87" data-source="post: 420186" data-attributes="member: 13534"><p>Neutral/earth fault somewhere???</p><p></p><p>Think i will add to that..</p><p></p><p>Earth, is basically in parallel with neutral, with them joined either at the cutout or back at the substation. Say you have a fault neutral/earth after the RCD. You switch on something that pulls a large current, like your motor starting, and some of the current makes it back to source down the earth, INSTEAD of the neutral, unbalances the RCD, and off it trips!!! Will not matter if it is a class 2 appliance as this is not the route the current takes, [unless the appliance is faulty] Tis a fault in the fixed wiring...</p><p></p><p>TNCS?????</p><p></p><p>john..</p></blockquote><p></p>
[QUOTE="apprentice87, post: 420186, member: 13534"] Neutral/earth fault somewhere??? Think i will add to that.. Earth, is basically in parallel with neutral, with them joined either at the cutout or back at the substation. Say you have a fault neutral/earth after the RCD. You switch on something that pulls a large current, like your motor starting, and some of the current makes it back to source down the earth, INSTEAD of the neutral, unbalances the RCD, and off it trips!!! Will not matter if it is a class 2 appliance as this is not the route the current takes, [unless the appliance is faulty] Tis a fault in the fixed wiring... TNCS????? john.. [/QUOTE]
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