I have a Siemens 200 amp main service panel in my basement. The main service lines are two black and one black with a yellow stripe going to the neutral bar. The grounding bar is attached to a ground cable through the bottom of the box to a rod in the basement floor. All the circuits in this box are 240v/double pole 2-wire breakers (it services another 200 amp panel on the main floor), There are NO wire connections to the neutral bar at all so it appears to me it is not grounded. I want to install a whole house surge protector in the panel but it's my understanding it must be connected to a grounded neutral bus bar. Do I simply install a jumper from the ground to the neutral bar?