Hi,
I'm a bit confused on how I should ground a new home-made device that's connected to mains through a 220v to 15v transformer. I read somewhere that if you connect both grounds of the transformer together to the mains earth, you could have problems later on (e.g. blowing measuring devices like oscilloscopes and multimeters when connecting the ground in the wrong place in the circuit) so I kept both sides of the transformer isolated; only connecting the core of the transformer to the mains earth and to the chassis of the device, but not anywhere in the circuit.
The device works fine as it is, but I just bought the output BNC connectors, and they need to be connected to the chassis -and therefore, to the mains earth-. I made a test connecting the circuit's ground to the chassis, and therefore to the mains' earth, and it seems to also work; the problem is: when I touch the chassis I can feel a small amount of current.
Also, and I don't know if it's important for this case, in my electrical installation all the neutrals of the wall sockets are disconnected -there's no third wire from each socket to earth, only live and neutral-.
So, I'm a bit confused on how I should proceed and a bit worried of doing tests on my own and blowing up something... or even getting electrocuted.
I'm a bit confused on how I should ground a new home-made device that's connected to mains through a 220v to 15v transformer. I read somewhere that if you connect both grounds of the transformer together to the mains earth, you could have problems later on (e.g. blowing measuring devices like oscilloscopes and multimeters when connecting the ground in the wrong place in the circuit) so I kept both sides of the transformer isolated; only connecting the core of the transformer to the mains earth and to the chassis of the device, but not anywhere in the circuit.
The device works fine as it is, but I just bought the output BNC connectors, and they need to be connected to the chassis -and therefore, to the mains earth-. I made a test connecting the circuit's ground to the chassis, and therefore to the mains' earth, and it seems to also work; the problem is: when I touch the chassis I can feel a small amount of current.
Also, and I don't know if it's important for this case, in my electrical installation all the neutrals of the wall sockets are disconnected -there's no third wire from each socket to earth, only live and neutral-.
So, I'm a bit confused on how I should proceed and a bit worried of doing tests on my own and blowing up something... or even getting electrocuted.
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