240V Power Socket with USB outlets leaks current/not grounded ?
I replaced my wall power socket with it and both the USB charging ports works fine and so does the power socket (when I connected my 240volt desk lamp to it).
However, when I happened to make a call on my iPhone whilst it was charging (from one of the usb ports), there was a "tingling" sensation when I held the phone to my ear. This is a repeatable process... turn the switch off/disconnect from the USB port and the "tingling" goes away, turn it on/connect the phone to the USB port and the "tingling" is back again.
There is obviously a grounding/current leakeage problem from this "Socket". I can't feel the "tingling" when the connected phone is being held in my hand. It is very apparent when the phone is held next to my ear.
I have ascertained that the connection to the power socket is correct ie. Live, Neutral and Earth are all correctly wired.
1. Is there a way to detect this leakage other than only using my ear ? ( I need to show the manufacturer that this is a real problem either with a video or be able to measure this leakage objectively). Is there a electrical device /detector for this ?
2. How dangerous is this situation ... Could it have electrocuted my family ?
3. What is the cause of this ? Is it because of poor earthing/grounding in my house wiring ?