6 ms·

now if they can just make it earthed by not lacquering the connector designed for that purpose to make it shiny... maybe macbooks everywhere will stop giving pe

by jheriko 10y ago

now if they can just make it earthed by not lacquering the connector designed for that purpose to make it shiny... maybe macbooks everywhere will stop giving people shocks (!)

TD-Linux 10y ago
Double-insulated appliances don't need to be earthed.
- jheriko 10y ago
  a long time ago i used to work in a factory testing fairly low build quality computers, if i did their qa process on macbooks they would fail this 15 year old test because of this. i know that us standards are often different to uk, europe and others in this regard. maybe it is safe and our standards are paranoid, but i don't enjoy electric shocks, no matter how small they are... and from talking to others, this is not an uncommon experience - at least on 2013 and newer macbooks using the UK version of the plug
beedogs 10y ago
A small amount of current leakage is actually normal in a well-designed switch-mode power supply, as odd as that may sound.
- jheriko 10y ago
  not into my body its not. at least based on my many years of using electrical devices - i've not seen this kind of problem on the same level that i can remember, except for the static build up on old CRT TVs.
  - cnvogel 10y ago
    There will be some kind of current into the "Ground" terminal on the output (i.e. your computer case) for most small switching power supplies (two-prong without separate protective earth pin). This current is caused by the "Y-Capacitor" which goes between the secondary ground/shielding and one of the power inputs. http://electronics.stackexchange.com/questions/216959/what-does-the-y-capacitor-in-a-smps-do http://electronics.stackexchange.com/questions/216959/what-d... This is needed for proper EMI/RF immunity and because of this you often can measure the line voltage (or half of the line voltage, depending on how the Y capacitor is connected internally) on the output pins with a high-impedance multimeter. No significant current can flow, though, because at the line frequency (50 or 60 Hz) the impedance of the Y capacitor (typically 1nF or so) is pretty high (2.5MOhm). For 230V, this would correspond to 0.1mA.

by jheriko 10y ago

now if they can just make it earthed by not lacquering the connector designed for that purpose to make it shiny... maybe macbooks everywhere will stop giving people shocks (!)

TD-Linux 10y ago

Double-insulated appliances don't need to be earthed.

jheriko 10y ago
a long time ago i used to work in a factory testing fairly low build quality computers, if i did their qa process on macbooks they would fail this 15 year old test because of this. i know that us standards are often different to uk, europe and others in this regard. maybe it is safe and our standards are paranoid, but i don't enjoy electric shocks, no matter how small they are... and from talking to others, this is not an uncommon experience - at least on 2013 and newer macbooks using the UK version of the plug

beedogs 10y ago

A small amount of current leakage is actually normal in a well-designed switch-mode power supply, as odd as that may sound.

jheriko 10y ago
not into my body its not. at least based on my many years of using electrical devices - i've not seen this kind of problem on the same level that i can remember, except for the static build up on old CRT TVs.
- cnvogel 10y ago
  There will be some kind of current into the "Ground" terminal on the output (i.e. your computer case) for most small switching power supplies (two-prong without separate protective earth pin). This current is caused by the "Y-Capacitor" which goes between the secondary ground/shielding and one of the power inputs. http://electronics.stackexchange.com/questions/216959/what-does-the-y-capacitor-in-a-smps-do http://electronics.stackexchange.com/questions/216959/what-d... This is needed for proper EMI/RF immunity and because of this you often can measure the line voltage (or half of the line voltage, depending on how the Y capacitor is connected internally) on the output pins with a high-impedance multimeter. No significant current can flow, though, because at the line frequency (50 or 60 Hz) the impedance of the Y capacitor (typically 1nF or so) is pretty high (2.5MOhm). For 230V, this would correspond to 0.1mA.