In the diagram below, a 2-
Diagrams shown on this page are simplified for clarity. Electrical outlet boxes can have numerous NM cables going in and out. See Actual Switch Box Wiring Diagram.
Typical NM Ground Wire Connections Diagram is shown below.
All ground wires and device terminals are connected together in each outlet box.
In each electrical box, all ground wires are connected together. Ground is also connected to the ground terminal of a device (switch, receptacle, light fixture, etc).
In the to the right, a 3-
The ground connection is shown in this diagram.