Service panel on the exterior of home. Home is two years old. Distribution panel in garage about 50 feet away. I only see two ungrounded conductors and one grounded conductor coming to panel. I dont see a ground? I usually see a ground lug attacthed to the ground strip or bus. What is going on or am I missing something? How much smaller can the ground be on a 4-wire system. Any help would be appreciated. PS - all the ground wires appear to be 12 gauge. 60 amp feed from service panel. I would think mininum of a #6 ground conductor would be needed on a 4 wire system goint to the distribution panel.