Im installing an electric cooktop. The existing conductors from the panel are red, black and white 8 AWG. The white is connected to the ground/neutral bar in the main panel. The neutrals and grounds from all the other circuits are mixed between two neutral/ground bars. The new cooktop only has a red, black and bare copper ground. Do I connect the ground from the cooktop to the white from the panel? Does it matter which ground/neutral bar it's connacted to? Does this make sense? Thanks!!!