Always connect a ground wire from the generator equipment grounding terminal to bare metal on the vehicle frame as shown. OM-4418 Page 13 4-3. Grounding Generator When Supplying Building Systems GND/PE 1 2 Use ground device as stated in electrical codes. 2 3 800 576-B 1 Equipment Grounding Terminal 2 Grounding Cable Use #10 AWG or larger insulated copper wire. 3 Ground Device Ground generator to system earth ground if supplying power to a premises (home, shop, farm) wiring system. Open 1 Closed