Fw: [sdiy] Grounding check (OT)

[René Schmitz]

Hi Jaroslaw et al.,

Jaroslaw Ziembicki wrote:
> Just a comment to this topic:
> I've got some some music (concert) videos and I see that
> some guitarists used to have a small carpet under their feet on
> the stage. Especially those who also sing.
> There is an interview with Greg Lake from Emerson Lake & Palmer
> who says that once he got an electric shock from the microphone
> and since this time he prefers to put an (insulation) carpet onto
> the stage floor...
> Maybe that's the only reliable way to avoid grounding problems...

Unfortunately not. A friend of mine had an experience with a mixer/PA 
combo, where some smart at ss (read previous owner) had "lifted" the 
protective earth. He was grounded through his guitar amp, and the 
microphone was sort-of-grounded to the floating GND potential of the 
console. Whenever he touched both the guitar strings and the mic, he got 
a mild zap.

Even if the thing was properly grounded, its still possible to plug it 
into another outlet, where there can be a voltage difference between the 
PE terminals.

Cheers,
  René


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uzs159 at uni-bonn.de
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