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 Post subject: Exploding appliances
PostPosted: Tue Jul 31, 2018 11:00 pm 
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Hi, hoping someone can help!

We had a whole-house rewire done a couple of months ago. Since then, we've had a hoover and now a hairdryer explode - both were plugged in in the same area of the house. Is it likely to be connected with the rewire, how can we check safety, and should we be worried?

Thanks in advance!


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 Post subject: Re: Exploding appliances
PostPosted: Tue Jul 31, 2018 11:45 pm 
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Define 'explode'.

Did they "blow the bl**dy doors off" or just blow a fuse? There are many causes for electrical failure and some can happen spectacularly although their "legally required" protection should prevent anything too spectacular.

Were the items 'cheap Chinese knock offs' or legit high street purchases?

Too many unknowns to give a proper answer.

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 Post subject: Re: Exploding appliances
PostPosted: Wed Aug 01, 2018 9:04 am 
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When I said 'explode' I meant that both pieces of electrics (hairdryer and dyson hoover so not cheap Chinese), started making a louder noise - like they were suddenly working harder/quicker - then there were sparks, a flame and then a bang and then smoke. Fuses did not trip on either occasion.


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 Post subject: Re: Exploding appliances
PostPosted: Wed Aug 01, 2018 9:23 am 
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most modern electronics can work over a wide range off voltages being safe to use over say 185-280v for example
some will also be happy at say 85-260v
exceptions tend to be motors or anything that heats up and are required to give out a heat or power output to quite close limits
so the point i am making is i suspect your voltage is quite high and needs to be checked :lol:
do you notice any flickering or surging at any time ??

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 Post subject: Re: Exploding appliances
PostPosted: Wed Aug 01, 2018 9:55 pm 
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There's no realistic way an individuals house voltage can be different from neighbours (unless you're on your own transformer-derived supply like we are - but we're very remote and such service provision is common here).

The Dyson may be the direct-drive motor version that doesn't work for a direct connection to the mains but via a DC voltage controlled internally by the electronics - effectively isolated from the direct mains supply.

Was the hair drier of the same ilk?

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 Post subject: Re: Exploding appliances
PostPosted: Thu Aug 02, 2018 6:18 pm 
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Although you can get faults allowing over voltage it is unlikely you would losses just two items. When it happens near everything switched on fails. I suspect your just unlucky the two items have come to end of life.


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 Post subject: Re: Exploding appliances
PostPosted: Thu Aug 02, 2018 6:46 pm 
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This is only a "wonder" really.
But what about solar panels feeding into the mains?
Surely with a nice sunny day, and depending on the settings for the electronics, that could push the voltage up?


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 Post subject: Re: Exploding appliances
PostPosted: Thu Aug 02, 2018 9:36 pm 
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No, solar panels have to be connected to an inverter, the inverter should fail first.
The other thing you overlooked is, if the voltage did increase, why did nothing else "explode"

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 Post subject: Re: Exploding appliances
PostPosted: Thu Aug 02, 2018 9:43 pm 
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someone-else wrote:
No, solar panels have to be connected to an inverter, the inverter should fail first.
The other thing you overlooked is, if the voltage did increase, why did nothing else "explode"

No they never are!

You mean to say they don't just connect the DC output straight to the mains.
Well I am surprised! :roll:
And I had a it of a Google.
Output voltage from the inverter of a solar panel can go up to around 260Volts.
So it's just possible that if the winding insulation in a motor is getting old, it could just push it over the edge, while other things would be OK.
And never say "never" with electrics.
I've seen some weird stuff happen.


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 Post subject: Re: Exploding appliances
PostPosted: Thu Aug 02, 2018 10:36 pm 
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Truth is, we will never know why they "Exploded"

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 Post subject: Re: Exploding appliances
PostPosted: Thu Aug 02, 2018 11:09 pm 
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240V to 260V is less than a 10% increase and something that most (all?) electrics could cope with.

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