Re: Tingles from power supply

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#1422

From: Sylvia Else
Date: Mon, 09 Mar 2009 23:20

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Rich Grise wrote:
> On Mon, 09 Mar 2009 01:20:22 +1100, 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?
>>
> 
> If the wart is 2-prong, turn it around in the socket. If it's 3-prong,
> get an outlet tester.

I can't really see how that could be relevant. If the device's low 
voltage side was completely isolated (which I've now learned it isn't), 
then changing the mains pins around wouldn't make any difference.

Australia's power plugs cannot be reversed, even if they're only two 
prong. The sockets look like these:

http://en.wikipedia.org/wiki/File:Wall_wart.jpg

Sylvia.

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Date: Tue, 10 Mar 2009 10:20:26 +1100
From: Sylvia Else <sylvia@not.at.this.address>
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Subject: Re: Tingles from power supply
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