Everything's possible, though. I, for example, have an R7S halogen powered lamp at home with dimmer and use it dimmed most of the time. From time to time, however, a flash of light comes out of it; that must be due to “something” (fridge compressor turning on/off, etc) which causes the dimmer to momentarily go DD. The dimmed filament also causes an audible resonance which gets through the AC line and causes my smartphone screen to behave erratically if charger connected to its nearby sockets.
Strange suggests. How can you connect ground to device with 2-pins connector? If device is big, not portable and have metall case you can use custom wire with 3-pin plug (and connect ground wire to the case), but all this dont apply to cells charger.
I can recommend you do simple test to all devices with relatively big AC voltage measured with dmm:
- temporary connect negative output to the ground
use AC clamp meter to measure AC current flowing in this wire
If you will measure under 2mA, you shouldnt worry
If you will measure 5-10mA, this is still pretty safety but can force RCD circuit breaks if you have several similar devices
If you will measure more than 20mA, you shouldnt use this device
Class 2 equipment, that is equipment without earth connection may have up to 0.25mA in leak current from the mains. Some people can feel it.
How much voltage you will measure depends on the actual piece of equipment, what way you put in plug in and your meter.
I do verify that 0.25mA value, that is a function on my high voltage tester and until now I have not seen any equipment with too high current.
High leakage devices is usual not really feasible to play with due to GFI/RCD.
Not another name for a GFI/RCD or as it is called around here HPFI (Depending on incarnation is letters are FI, HFI and now HPFI, there may also be a PFI).
I was curious so I measured a couple PSUs I had near me. The power supply of my Zanflare C4, on 230V, measures 93.5V between earth and ground/negative. On the other hand, shorting the earth and ground and measuring the current shows a value around 190μΑ . My Blitzwolf USB power brick again measures 93.5V, short circuit current is around 160μΑ.
No, that is way to high. In my test the C4 was below 0.25mA. I do not write down the actual value, but if it is too high my tester stops immediately with a loud noise.