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Central Heating tripping RCD?
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 505971" data-attributes="member: 250"><p>RCD'S detect current leaking to earth. Very, very very small amount of currents (30ma)..</p><p></p><p>As the majority of program controllers are of a plastic, (double insulated) construction, they do not require an electrical earth connection to work safely..</p><p></p><p>(although there is a normally an earth terminal to maintain earth continuity between the incoming and outgoing wires)</p><p></p><p>so I would doubt it is the controller...</p><p></p><p>and doing random swapping method of fault finding is never normally cost effective...</p><p></p><p>Unless the fault was on when your previous electricians &amp; heating engineers did their tests, then I don't think they have actually proved much yet.?</p><p></p><p>so I don't think you can actually eliminate much from your investigations.</p><p></p><p>A very small internal leak on a seal in a valve or pump could easily allow a small drip of water to bridge a live component and metallic earth..</p><p></p><p>But also dry out due to the heat from the pipework leaving an intermittent fault..</p><p></p><p>Which would show as being all electrically good if not tested whilst the fault itself is on!</p><p></p><p>You could also be experiencing a cumulative leakage problem..</p><p></p><p>which is not 100% caused by the boiler.</p><p></p><p>Is the boiler on its own circuit?</p><p></p><p>how far away from the fuse box is it?</p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 505971, member: 250"] RCD'S detect current leaking to earth. Very, very very small amount of currents (30ma).. As the majority of program controllers are of a plastic, (double insulated) construction, they do not require an electrical earth connection to work safely.. (although there is a normally an earth terminal to maintain earth continuity between the incoming and outgoing wires) so I would doubt it is the controller... and doing random swapping method of fault finding is never normally cost effective... Unless the fault was on when your previous electricians & heating engineers did their tests, then I don't think they have actually proved much yet.? so I don't think you can actually eliminate much from your investigations. A very small internal leak on a seal in a valve or pump could easily allow a small drip of water to bridge a live component and metallic earth.. But also dry out due to the heat from the pipework leaving an intermittent fault.. Which would show as being all electrically good if not tested whilst the fault itself is on! You could also be experiencing a cumulative leakage problem.. which is not 100% caused by the boiler. Is the boiler on its own circuit? how far away from the fuse box is it? [/QUOTE]
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