really weird problem... :(

[extension]

Im sorry if i have posted in the wrong section, but i wasnt able to find a better one... And im also sorry for taking up your time...

Please excuse my English...It isnt very good..

My problem is this:

I have bought a TV card for my computer and tried to connect the antenna to it. (75ohm/coaxial antenna). The computer was plugged into a non grounded socket. When the antenna touched the chassis of the computer the electric safety switch went off. - i dont know how its called-

Not knowing what the cause was i did some experiments and it seems that the safety switch will go off even if i just connect the pc to a socket that is grounded, without having to come in contact with the antenna.So i guess the antenna plays the same role when i used a non grounded socket..

I have also replaced the computer power source, but the problem still persists.

The sockets that are not grounded seem to have the grounding "pin" attached to the null -i dont know if this is the proper term..im trying to say "the exit" of the socket-

I did some measurements [see atachment]..

Im sorry for my lousy English..

Does anyone have any ideas?

 

[extension]

It seems there is either some sort of problem with wire insulation (the house was made a long time ago and some parts of the electrical circuit havent been changed) or with the diferential switch.

And since i cannot fix either problem by myself, Ill call an electrician over to see whats going on...

Ill keep you posted!

 

[Chappers]

Ill keep you posted!

Please do, it's always interesting to find out what the cause was of a problem. My money's on cable insulation deteriorated or faulty appliance/fitting somewhere leaking to earth.

 

[WarrenG]

Please do, it's always interesting to find out what the cause was of a problem. My money's on cable insulation deteriorated or faulty appliance/fitting somewhere leaking to earth.

Yes Chappers it woukd be interesting to find out whats happening, a 300mA RCBO and a 'C' rating at that!

I am gonna go with 'switch on surges' for the kit plugged in. Mains filter capacitors charging up with a high leakage to earth.

If there is a 300mA RCBO fitted there must be an expect high leakage on the system in general. Add this to the kit surges and pop?????

Somethings a miss - extension keep us posted!

 

[extension]

Well, the fake ground was the problem. It seems current exiting the appliances was going through both null and the fake ground. So when I plugged the computer to a real grounded socket, the fake ground got connected to the real ground and the current went from null to the earth.

 

[Chappers]

When you say null, do you mean neutral? As in the neutral of the socket was connected to earth?

 

[extension]

Yes. Its an old house and this connection -neutral-ground- has been done in more than one socket. So, the electrician said he is going to remove that switch.

But Ive got a new question: what will happen when i plug in the antenna? Is there a chance that the current leaking throught it might destroy the tv?

 

[DanBrown]

It might be an idea to put one of those belkin spike supressors on the tv. You can get the one's with coaxal connections on. How much is you tv worth?

One to consider, especially while sales are on!.
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