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Lighting circuit tripping RCD
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 190347" data-attributes="member: 250"><p>Even if there are no crosses or joins between circuits.. You have still got</p><p></p><p>to pair up your live and neutrals to change the CU anyway???</p><p></p><p>So that aspect has got to be done..</p><p></p><p>Once you have paired up your Lives &amp; neutrals it is not hard to check if any power is coming back down a wrong neutral..</p><p></p><p>can be done with continuity testing on dead circuits with all lights switched on...</p><p></p><p>Bit more tricky if its across florries as you say..</p><p></p><p>And compounded again with low energy lamps stuck everywhere..</p><p></p><p>But as we know 90%+ of the cross-overs are on landing and/or hall light bayonet fittings so can concentrate investigation to prove or disprove these specific lamps?.</p><p></p><p>TBH it is easiest done with a bit of judicious live testing, checking for voltages on disconnected neutrals with respect to the main neutral bar rather than metering out dead continuity through lamps.</p><p></p><p>And in reality MOST domestics installations even if singles and wylex boards tend to only have TWO or Three lighting circuits at most and maybe 5 or six pairs of cables coming in even on a larger job!</p><p></p><p> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 190347, member: 250"] Even if there are no crosses or joins between circuits.. You have still got to pair up your live and neutrals to change the CU anyway??? So that aspect has got to be done.. Once you have paired up your Lives & neutrals it is not hard to check if any power is coming back down a wrong neutral.. can be done with continuity testing on dead circuits with all lights switched on... Bit more tricky if its across florries as you say.. And compounded again with low energy lamps stuck everywhere.. But as we know 90%+ of the cross-overs are on landing and/or hall light bayonet fittings so can concentrate investigation to prove or disprove these specific lamps?. TBH it is easiest done with a bit of judicious live testing, checking for voltages on disconnected neutrals with respect to the main neutral bar rather than metering out dead continuity through lamps. And in reality MOST domestics installations even if singles and wylex boards tend to only have TWO or Three lighting circuits at most and maybe 5 or six pairs of cables coming in even on a larger job! :) [/QUOTE]
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