I'VE READ A FEW TOPICS ON THIS SUBJECT BUT I JUST WANT TO MAKE SURE.I'M CHANGING MY OLD PLASTIC SWITCHES & SOCKET FACEPLATES TO CHROME ,AND I THINK I'M CORRECT IN SAYING THAT YOU HAVE TO HAVE A LINK OF EXTRA EARTH WIRE FROM THE BACK OF THE CHROME FACE PLATE TO THE EXSISTING EARTH WIRE IN THE METAL BOX.....MIGHT BE A SILLY QUESTION BUT IS THERE A CERTAIN SIZE OF EARTH WIRE OR ARE THEY ALL STANDARD.?