I have a range that I am hooking up, there is a red wire, black wire, copper wire and a white wire, I am asking if the white wire is a common wire or is it ground?
White is neutral, green is ground
White is the neutral (return). Green is ground (safety). Think of it this way: white is the normal way for power to return (like a drain pipe). Green is the safety (floor drain) that deals with spills.