Hi,
In my apartment, if I touch the bare metal case of certain electronics with a bare finger (in particular the back of a knuckle) while standing on the floor with bare feet, I get a tiny shock.
This happens with the metal case of a DVD player, the bare metal of a TV antenna, the bare metal of a laptop case, and the bare metal of a capacitive touch volume control on a set of speakers.
I live in Asia, and we have 230V power with type F outlets.
Some of the electronics that give these tiny shocks are connected to the ground (earth) pins of the outlets, while some are not.
So what is causing this? Is it that the AC neutral wire in my apartment is at a different voltage than the earth? Or is it that the ground/earth wire in my apartment is not actually connected to the earth? Or could it have something to do with incorrect polarization (plugging the live AC wire into neutral), since type F outlets are not polarized?
As a related question, how does grounding work with external AC-to-DC power supplies? So for example if my laptop's power supply AC plug has a connected ground pin, but the output DC connector is just 2 pins (plus and minus), is one of these 2 DC pins connected to the metal case of the laptop? Which one? And is one of these 2 DC pins somehow connected to ground? How?
See a Type F connector: http://electricaloutlet.org/type-f
Thanks
In my apartment, if I touch the bare metal case of certain electronics with a bare finger (in particular the back of a knuckle) while standing on the floor with bare feet, I get a tiny shock.
This happens with the metal case of a DVD player, the bare metal of a TV antenna, the bare metal of a laptop case, and the bare metal of a capacitive touch volume control on a set of speakers.
I live in Asia, and we have 230V power with type F outlets.
Some of the electronics that give these tiny shocks are connected to the ground (earth) pins of the outlets, while some are not.
So what is causing this? Is it that the AC neutral wire in my apartment is at a different voltage than the earth? Or is it that the ground/earth wire in my apartment is not actually connected to the earth? Or could it have something to do with incorrect polarization (plugging the live AC wire into neutral), since type F outlets are not polarized?
As a related question, how does grounding work with external AC-to-DC power supplies? So for example if my laptop's power supply AC plug has a connected ground pin, but the output DC connector is just 2 pins (plus and minus), is one of these 2 DC pins connected to the metal case of the laptop? Which one? And is one of these 2 DC pins somehow connected to ground? How?
See a Type F connector: http://electricaloutlet.org/type-f
Thanks