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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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Voltage earthing through dishwasher casing/door
Found out earlier that when I plug my new Bosch dishwasher into a short extention lead (one without and earth wire for some reason (after investigating)) there is some residual voltage running through the casing/metal door lining. Upon touching the door I got a small shock (bit like and electric fence).
Checked it out and it seems to be of the figure of 50v running between the door and the floor i.e. with me acting as an earth!! Bit more than I expected for residual voltage, as you would get with most appliances. Once plugged in to the normal ring main and not with the crappy ext lead (that which is now confined to the shed as spare parts) the residual voltage reading drops to zero (as expected) as the integral earth wire is taking it away. My question is: does this sound right or is the appliance faulty? |
#2
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Voltage earthing through dishwasher casing/door
On Thu, 21 Sep 2006 22:30:06 +0100,it is alleged that Cordless Crazy
spake thusly in uk.d-i-y: Found out earlier that when I plug my new Bosch dishwasher into a short extention lead (one without and earth wire for some reason (after investigating)) there is some residual voltage running through the casing/metal door lining. Upon touching the door I got a small shock (bit like and electric fence). Checked it out and it seems to be of the figure of 50v running between the door and the floor i.e. with me acting as an earth!! Bit more than I expected for residual voltage, as you would get with most appliances. Once plugged in to the normal ring main and not with the crappy ext lead (that which is now confined to the shed as spare parts) the residual voltage reading drops to zero (as expected) as the integral earth wire is taking it away. My question is: does this sound right or is the appliance faulty? With a modern new dishwasher, it's likely to have electronic controls, and thus a mains interference suppressor, which would have capacitors to earth, resulting in a few volts (usually around half mains potential) to 'frame' if the frame isn't earthed. Usually the leakage is quoted to be at single digit or fractional milliamps from a healthy filter. -- There is not the slightest indication that nuclear energy will ever be obtainable. It would mean that the atom would have to be shattered at will. - Albert Einstein, 1932 |
#3
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Voltage earthing through dishwasher casing/door
Cordless Crazy wrote:
Found out earlier that when I plug my new Bosch dishwasher into a short extention lead (one without and earth wire for some reason (after investigating)) there is some residual voltage running through the casing/metal door lining. Upon touching the door I got a small shock (bit like and electric fence). Checked it out and it seems to be of the figure of 50v running between the door and the floor i.e. with me acting as an earth!! Bit more than I expected for residual voltage, as you would get with most appliances. Once plugged in to the normal ring main and not with the crappy ext lead (that which is now confined to the shed as spare parts) the residual voltage reading drops to zero (as expected) as the integral earth wire is taking it away. My question is: does this sound right or is the appliance faulty? The voltage measured is as much a function of the meter as the appliance, so 50v doesnt tell us much. But a shock form it means its leaking more than it should, so yes somethings wrong. Earthed leaky fixed appliances are commonish and dont seem to contribute to the death figures, even though one would imagine them to be a risk. NT |
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Voltage earthing through dishwasher casing/door
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#5
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Voltage earthing through dishwasher casing/door
Andy Wade wrote:
wrote: But a shock form it means its leaking more than it should, so yes somethings wrong. I don't agree with that bit. A Class 1 appliance like this could leak up to 0.75 mA, which is more then enough to give a perceptible sensation or tingle, but not a dangerous shock. There's no evidence here of anything being wrong at all, apart from the OP having extension leads lying around with no earth conductor. A tingle is not an electric fence like jolt where I come from. NT |
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