| General > General Technical Chat |
| Deadly problem with house wiring |
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| MarcusFunt:
I made a quick video about the problem. https://youtu.be/5d6zy09IbGw Please dont hesitate asking questions if i missede a piece of information :D |
| tom66:
Is this not just an effect of class-Y double-isolated appliances? Since you measure no difference between house ground and outside ground, you do not have something like a PEN fault. To test your theory you should check voltage between N and E and L and E. In Denmark, almost every property is 'TT', which makes a PEN fault impossible. You could have a TN-C-S property which would allow for PEN fault but these are (according to Wiki) quite rare in Denmark. |
| BrokenYugo:
The case with sparking is probably a real problem that should be handled carefully. I'd assume in whatever powers the mic. Everything else, you're probably just measuring expected leakage current through Y caps and whatnot, in certain scenarios (e.g. barefoot on earth or a bare concrete floor) that little current can be felt. Remember that it does not take much current to generate a voltage across the 10 megaohm input impedence of a typical DMM, in fact you can use that resistance as a current shunt in a pinch, 1 volt=100 nano amps (0.1 uA). Takes a "low impedence" meter, or a light bulb, to see if there's any hazardous current available, this is why electrician oriented enters usually have such a mode, or outright make all voltage measurements low z. |
| Monkeh:
Call an electrician. |
| MarcusFunt:
I did the same tests again with a 820kohm to simulate a human body. I got 7 volt om the solderimg iron(enough to feel on my leg with a antistatic strap on ). On the Charger i got 1 volt with my body as gnd ref. I got 115 volt (yes. not a mistake) through the resistor on the mic.i got the same 115 across a 410kohm with a 4nf cap on. I suspect that the same problem is happening in out Kitchen because we can feel a small elektrick shock when we touch the body of the microwave(gnd is Stone tiles) |
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