Electrification on MacBook while charging

Hi everyone, I am charging my macbook air with original 2-pin 45W magesafe. When I touch the computer I feel an electrification while charging. I tried to charge different power sockets but I felt same little shock of electricity each time and no difference when computer is turned off while charging.
Mostly the electification takes place around just above of function keys and back of screen.

there could be an extremely slim chance of a fault on the IO board, however if so, that would be the 1st case Ive heard of same.
electrostatic (dielectric) spillover to the the alloy macbook Air chassis is very rare. 
Verify same on another power outlet.  
verify on another charger at your local Apple store.
Verify same at a different building if you can.
Contact Apple for appt. for in shop free diagnostic,
however from your indications, the only largely plausible points of causation are power issue on the outlet/ building or on the charger block of the charger.

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