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Do-It-Yourself (DIY) Question & Answer Forum
RCCB failure mode??
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<blockquote data-quote="apprentice87" data-source="post: 490378" data-attributes="member: 13534"><p>Hi All,</p><p></p><p>Split load board..</p><p></p><p>Well here i was at about midnight, when suddenly half the house electrics trip off..</p><p></p><p>All MCB's on, [as they would be] but both RCCBS also on too... Hmmm</p><p></p><p>Try the test buttons.. one works, the other does not.. Hmm some more..</p><p></p><p>If one RCCB has a feed, then for obvious reasons they both do.. [as the inputs are linked]</p><p></p><p>Ok, so i soon discover that the one RCCB has a feed, but no output..</p><p></p><p>Mess about with the button a bit and the output comes back on, sometimes! [and goes off too without a sound or the thing "tripping"]</p><p></p><p>Ok, so i found a possible earth fault [immersion heater] so this explains the original trip and fault cleared.</p><p></p><p>More messing reveals that the RCCB trips if it sees an earth fault ok, BUT, resetting the thing does not always work [as in an output from the thing] AND sometimes, despite the thing obviously has a live feed, the test button does not work..</p><p></p><p>Is this a usual type of thing to see??</p><p></p><p>john..</p></blockquote><p></p>
[QUOTE="apprentice87, post: 490378, member: 13534"] Hi All, Split load board.. Well here i was at about midnight, when suddenly half the house electrics trip off.. All MCB's on, [as they would be] but both RCCBS also on too... Hmmm Try the test buttons.. one works, the other does not.. Hmm some more.. If one RCCB has a feed, then for obvious reasons they both do.. [as the inputs are linked] Ok, so i soon discover that the one RCCB has a feed, but no output.. Mess about with the button a bit and the output comes back on, sometimes! [and goes off too without a sound or the thing "tripping"] Ok, so i found a possible earth fault [immersion heater] so this explains the original trip and fault cleared. More messing reveals that the RCCB trips if it sees an earth fault ok, BUT, resetting the thing does not always work [as in an output from the thing] AND sometimes, despite the thing obviously has a live feed, the test button does not work.. Is this a usual type of thing to see?? john.. [/QUOTE]
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RCCB failure mode??
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