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An oscilloscope with no earth (crappy wiring in house)
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HackedFridgeMagnet:
http://en.wikipedia.org/wiki/Earthing_system

From memory the reason Norway had the IT earthing system was that it was very hard to get a good earth as there was a lot of non conductive rock underneath.
Remember different places have different earthing systems so some of the info posted before would not apply to an IT earthing system.
Basically there is not as much chance of an earth fault so it is not much of a worry as it is in some places.


--- Quote ---I am not familiar with regulation in Norway, but in the Netherlands it was allowed if the the floor was non conducting.
--- End quote ---

--- Quote ---I don't know the electrical regulations in Norway so the only thing I can suggest is that you spent a little money and get an electrician to inspect your setup.
--- End quote ---
Those sound like good advice.


BTW: Australia, NZ have a modified TN-C-S system which we call the MEN system (Multiple Earthed Neutral, I think the multiple is the ground stake and the water pipe bond).
ovnr:
Well, you may have a ground somewhere in the house - even 80s houses had grounded outlets (kitchen stove, bathroom, etc). Consider just running a loose ground lead (of suitable size) to your lab - that's what I ended up doing.

Also, you can buy plug-in GFCIs - here's one. If you can't afford to have your house re-wired, I'd strongly suggest buying one for your lab.

(As others already have, I strongly suggest getting your wiring sorted out. Yes, it's ridiculously expensive, but it's worth it. And no more old decrepit outlets and light switches!)
mij59:

BTW: Australia, NZ have a modified TN-C-S system which we call the MEN system (Multiple Earthed Neutral, I think the multiple is the ground stake and the water pipe bond).
[/quote]

TN-C-S, PEN conductor in the distibution panel split in neutral and ground, see wiki
http://en.wikipedia.org/wiki/Earthing_system

Multiple ground means that the PEN conductor is earthed in different locations ( outside the the building )
queennikki1972:
I have the same issue. House built in 1947. No ground wires in the walls. In the United States having a electrician redo the wires is crazy expensive and i simply cannot afford it. I have grounding STUDS on my power strips and all my chasis ground although (open ground) are all tied together as they share the same outlets and power strips. I had considered running a ground wire from the ground studs to a grounding rod, but my knowledge of how this affects a 2 wire system is limited. I am confident as far as changing outlets and i do have GFCI outlets. I have search all over Google and have not found a direct answer to my problem other than simply rewiring the house and/or possibly using a Differential Probes or Active Probes. Any input is appreciated.

Fort Worth, Texas USA
 120vac
Main Panel is Grounded.
No ground wire in walls.

Thanks Nikki
HackedFridgeMagnet:

--- Quote from: mij59 on July 04, 2014, 02:23:35 pm ---
BTW: Australia, NZ have a modified TN-C-S system which we call the MEN system (Multiple Earthed Neutral, I think the multiple is the ground stake and the water pipe bond).


TN-C-S, PEN conductor in the distibution panel split in neutral and ground, see wiki
http://en.wikipedia.org/wiki/Earthing_system

Multiple ground means that the PEN conductor is earthed in different locations ( outside the the building )

--- End quote ---
No the Multiple in MEN is not the water bond. That much I can say.

I think the multiple is only in the case of several buildings on one supply.
There is only one Earth and Neutral bond per building ever. 

The first building has the incoming PEN conductor which is split to form Earth and Neutral.
any subsequent buildings on the property can either have

* an Earth cable from the first building run to it. 
* or if the dont have an Earth cable run then  they can bond the buildings local Earth to the incoming Neutral.
Also the Earth Terminal block at any Distribution board may have any number of connections to physical earth, and should definitely be bonded to any metal water pipe.

edit: sry didn't realise I was responding to such an old post  :-[
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