🚀 go-pugleaf

Eeyore wrote:
> 
> Sylvia Else wrote:
> 
>> J.A. Legris wrote:
>>> On Mar 8, 10:35 am, Sylvia Else <syl...@not.at.this.address> wrote:
>>>> Sylvia Else wrote:
>>>>> I've recently bought a D-Link DIR-300 wireless router. While
>>>>> disconnecting its power supply from it, I got a tingling sensation when
>>>>> I touched the plug (to be clear, I'm talking about the 5V DC plug, not
>>>>> the mains plug).
>>>>> An AVO meter shows about 90V AC to earth from either side of the 5V
>>>>> plug. Short circuit current to earth is about 0.1mA.
>>>>> Still, I thought these things were meant to be completely isolated. Has
>>>>> there been a change of approach?
>>>>> Sylvia.
>>>> Apparently it's normal, and is related to RFI suppression.
>>>>
>>>> Sylvia.
>>> Just think, the only thing between you and the great beyond is a thin
>>> layer of ceramic material, possibly contaminated with who-knows-what,
>>> bearing a certification logo of dubious authenticity. It's time to
>>> invest in some rubber-soled slippers.
>> It's certainly not a happy thought. I will be treating the low voltage
>> side of such power supplies with more respect from now on.
>>
>> BTW, I tried the same tests with the power supply for my cable modem. It
>> showed higher voltages, but lower current.
>>
>> But immediately after I'd unplugged it from the mains, I happened to
>> touch the mains plug pins with the palm of my hand, and got a
>> significant shock off it. Reverse leakage through the rectifiers? But
>> why should there even be enough to feel?
> 
> That's another cap ! You're not meant to touch the power pins immediately. It's
> all in IEC60065.
> 
> Graham
> 

Try this one.
Run an electric drill, then unplug it.
Get a "friend" to hold the plug in his hand, prongs inward.
Squeeze the trigger.

-- 
Dirk

http://www.transcendence.me.uk/ - Transcendence UK
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