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Upstream RCD Tripping?
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<blockquote data-quote="davetheglitz" data-source="post: 9929" data-attributes="member: 173"><p>Sorry Guys - this goes on a bit!</p><p></p><p><strong>Background</strong></p><p></p><p>Called out today after Western Power had disconnected my elderly customers ring main after they lost power. Apparantly the 30mA RCD in the house had gone - but so had the supply to the meter. After a lot of playing around they disconnected the ring main and told the customer it was down to them. No paperwork was left - so I'm only going on hearsay concerning the fault.</p><p></p><p>On checking - no fault on the ring main. &gt;3M insulation. Connected up - Zs at sockets around 60 ohms (TT) and no trip at 15mA - correct at 30mA.</p><p></p><p>Overall Zs all circuits in &gt; 2M.</p><p></p><p>No outside feeds from the ring main, no signs of damp.</p><p></p><p>The house is remote - it didn't have mains electricity until 1994 and it had to come in around a mile to a local transformer.</p><p></p><p>I'm at a loss to explain the trip - unless it's something like the fridge going into defrost causing the trip. However this doesn't explain the loss of supply to the meter.</p><p></p><p><strong>Here is the Question (at last!)</strong></p><p></p><p>I've been told that it is feasible for a tripping fault to be caused by a fault 'upstream' from the RCD. However I can't get my head around how this could work. Has anyone found anything similar - and if so has anyone got any explanations!</p><p></p><p>Thanks</p></blockquote><p></p>
[QUOTE="davetheglitz, post: 9929, member: 173"] Sorry Guys - this goes on a bit! [B]Background[/B] Called out today after Western Power had disconnected my elderly customers ring main after they lost power. Apparantly the 30mA RCD in the house had gone - but so had the supply to the meter. After a lot of playing around they disconnected the ring main and told the customer it was down to them. No paperwork was left - so I'm only going on hearsay concerning the fault. On checking - no fault on the ring main. >3M insulation. Connected up - Zs at sockets around 60 ohms (TT) and no trip at 15mA - correct at 30mA. Overall Zs all circuits in > 2M. No outside feeds from the ring main, no signs of damp. The house is remote - it didn't have mains electricity until 1994 and it had to come in around a mile to a local transformer. I'm at a loss to explain the trip - unless it's something like the fridge going into defrost causing the trip. However this doesn't explain the loss of supply to the meter. [B]Here is the Question (at last!)[/B] I've been told that it is feasible for a tripping fault to be caused by a fault 'upstream' from the RCD. However I can't get my head around how this could work. Has anyone found anything similar - and if so has anyone got any explanations! Thanks [/QUOTE]
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