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PostPosted: Tue Aug 07, 2018 4:36 pm 
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Hi
I have a distant relative who lives in Central London, in a flat, house converted. Since Saturday she has no electricity! Apparently a huge water leak from upstairs flat caused it. I don't know who she has called but they are waiting for walls to dry to turn electricity back. I have planned to go tomorrow if still not resolved.
Is it safe to assume only certain circuits are wet and others should be functional? The leak was in her bathroom, I would imagine consumer unit is not there.
I need some advise, is there any risk if I turn on the fuses in the CU? How to check if walls dried? Do people use fan to dry walls in such situations?
Any other input appreciated.

Thanks


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PostPosted: Tue Aug 07, 2018 11:05 pm 
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With a modern system likely you could not turn the power even if you want to, the RCD will likely not reset. However you don't do it by trail and error, you need an insulation tester, this uses 250, 500 or 1000 volts to test, a normal multi-meter is useless to test with.

The major problem with water is it cools things, so the air inside contracts, so it sucks the water in, I have seen light bulbs crack and completely fill with water, it would take years for that to dry out. However there are not normally junction boxes hidden in a wall, so likely it will not take long to dry out. But without the tester you don't know.


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PostPosted: Wed Aug 08, 2018 7:31 pm 
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ericmark wrote:
With a modern system likely you could not turn the power even if you want to, the RCD will likely not reset. However you don't do it by trail and error, you need an insulation tester, this uses 250, 500 or 1000 volts to test, a normal multi-meter is useless to test with.

The major problem with water is it cools things, so the air inside contracts, so it sucks the water in, I have seen light bulbs crack and completely fill with water, it would take years for that to dry out. However there are not normally junction boxes hidden in a wall, so likely it will not take long to dry out. But without the tester you don't know.


Thanks for reply
I didn't go as few sockets and lighting circuits are working plus better leave it to block management repairers to fix it.


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PostPosted: Wed Aug 08, 2018 8:03 pm 
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I was working in the Falklands 6 month trips, soon after leaving seems one of the kids over flowed the bath and they lost all power, most they were able to use within hours and after a few days they were able to switch the lights back on as long as they didn't use one in dinning room, why my wife did not get her father to fix it don't know, but must have been 4 months before I returned, and they still could not use dinning room light, I found the bulb was full of water, even after 4 months. At least it was an easy fix.


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