Re: Multiple GEC on one lug?
Originally posted by jjhoward:
Re: the size of the EGC, #6 cu is the max I need to my main breaker panel. If I have a disconnect by the meter pan, I #6 cu is the max needed there. But the gnd from the disconnect to the service panel is dictated by table 250.66? Is that so??
This is clearer if you state the function of each conductor.
GEC's are grounding electrode conductors. This conductor runs between the first means of disconnect for the building, and the grounding electrode. The size of your GEC is determined by table 250.66, as amended for specific electrodes in 250.53 (E - H). Your water pipe isn't amended by these sections, so it will be the full size determined by table 250.66.
EGC's are equipment grounding conductors, sized according to 250.122. These occur
after the first means of disconnect for a building.
If there is a disconnect outside, feeding a panel or two on the inside, the size of those EGC's are determined by 250.122.
Before, or to, disconnect: 250.66
After Disconnect: 250.122
Hope this helps.