🚀 go-pugleaf

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