If you are feeding a subpanel(50-125 amp) from a main service panel(200 amp) , do you need to have 4 wires to the sub panel? The grounding and grounded conductors are terminated at same place (theoretically) in the sub panel. therefore you would need to use the supplied "bonding" screw (green).right?
Please clear this up for me, as I have heard /seen many different methods on this. I have installed may subpanels with 3 wires and I REALLY want to know if I am doing this wrong.
