Looking at my main service panel how can I tell if my ground and neutral bars are bonded (as they should be?) I obviously don't see a jumper wire between the two bars but I was troubleshooting and got confused as to why some of the ground wires are ran to the neutral bar (on the left)? I see the green screw on the left but it appears not to go anywhere. Any help would be greatly appreciated.
The physical chassis of the breaker panel is grounded.
The ground strap tied to the green screw is tying the netural bar to the chassis of the panel. The accessory ground bar on the edge is also attached to the panel chassis.
In a main panel (service disconnect at the breaker) grounds are allowed as guests on the neutral bar.
I'm a little puzzled as to why I see so few grounds.