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Old 26th February 2009, 05:12 PM   #1
Igla is offline Igla  Slovenia
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Join Date: Jun 2003
Location: Slovenia
Default Overvoltage protection with filter

Hi !
I've recently got this product (photo) - it has surge protection and high frequency filter. I want to try it with my main music system. But here is a catch - ''normal'' houses have three wires in the inwall socket: live wire, neutral wire and ground wire. Ground wire goes separate way to the earth.
But my house is not far from transformer station so I don't have ordinary ground wire (the third wire). Because the house is close to the transformer I have (I don't know the right word) - we call it ''zero grounding''. Neutral wire and ground wire are wired together.
I must ask if someone knows about this and the filter will still perform as it should or is useles with the wirings I have in the house?
Regards;
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Old 26th February 2009, 05:17 PM   #2
AndrewT is offline AndrewT  Scotland
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Hi,
ground or Earth is often connected to the Neutral at the distribution board.

This is perfectly safe and will be compatible with your filtered socket strip.
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Old 26th February 2009, 05:33 PM   #3
Igla is offline Igla  Slovenia
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Join Date: Jun 2003
Location: Slovenia
Thanks a lot for the answer AndrewT.
I am confused because of the control lights that shows my wiring is not appropriate.
The manual says:
-if green indicator lights up everything is OK
-if orange indicator lights up the plug must be turned 180 degrees and then green indicator lights up
-if orange and green indicator lights up together then there is a problem with grounding
In my case both orange and green indicator lights on so the filter thinks that my grounding is not appropriate.
I've checked all my wall sockets with the same result.
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Old 26th February 2009, 06:37 PM   #4
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Zero grounding is an obsolete form of dealing with a TN-C grid. It means that PEN is used until the wall outlet, where N and PE are connected to the same lead. Here in Germany it was forbidden so long ago that in the eighties even all existing grids had to be renovated to comply with a TN-S configuration. It has nothing to do with the proximity of a transformer station. TN-C should end at the distribution board, and from there on there should be a TN-S grid.

Being IEC member countries, the same rules that apply here in Germany, apply probably in Slovenia as well.

For your surge protector / HF filter that means it will work, but not as good as it would in a TN-S grid, because the path to earth is neither short nor clean.
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Old 27th February 2009, 12:11 AM   #5
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Both lights lighting up probably means the ground is unconnected and floating.
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