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Help needed in trying to diagnose a fault please
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<blockquote data-quote="ChickenGeorge65" data-source="post: 461248" data-attributes="member: 30037"><p>Hi all, from my house I have a cable running to my garage in which I have a consumer unit with 4 x MCB's. 2 MCB's are for lighting (one circuit in my garage and the other in an adjacent outbuilding). The other 2 MCB's are for sockets (one circuit in my garage and the other in the adjacent outbuilding). Yesterday all was working fine and no electrical work has been done since. Tonight I flicked a light switch in the outbuilding and the whole feed to the garage from my house (running of 32Amp MCB) tripped. I've tried all lights and sockets in the garage and outbuilding turned off - but the 32Amp MCB in the house feeding the garage won't turn back on. I then tried turning all 4 x MCB's in the garage consumer unit off and then I CAN reset the house MCB. But as soon as I try any one of the 4 MCB's in the garage it trips the house MCB again.</p><p></p><p>It's made me suspect that the fault lies in either the garage consumer unit or the U/G cable fed from house to garage - BUT yet the house MCB doesn't trip with the garage one on and all MCB switches off.</p><p></p><p>Does anyone have any ideas please? Many thanks.</p></blockquote><p></p>
[QUOTE="ChickenGeorge65, post: 461248, member: 30037"] Hi all, from my house I have a cable running to my garage in which I have a consumer unit with 4 x MCB's. 2 MCB's are for lighting (one circuit in my garage and the other in an adjacent outbuilding). The other 2 MCB's are for sockets (one circuit in my garage and the other in the adjacent outbuilding). Yesterday all was working fine and no electrical work has been done since. Tonight I flicked a light switch in the outbuilding and the whole feed to the garage from my house (running of 32Amp MCB) tripped. I've tried all lights and sockets in the garage and outbuilding turned off - but the 32Amp MCB in the house feeding the garage won't turn back on. I then tried turning all 4 x MCB's in the garage consumer unit off and then I CAN reset the house MCB. But as soon as I try any one of the 4 MCB's in the garage it trips the house MCB again. It's made me suspect that the fault lies in either the garage consumer unit or the U/G cable fed from house to garage - BUT yet the house MCB doesn't trip with the garage one on and all MCB switches off. Does anyone have any ideas please? Many thanks. [/QUOTE]
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Help needed in trying to diagnose a fault please
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