Couldn't find anything in the NEC 2017 that forbids it, but wanted to double check: Can multiple grounding electrode conductors (thick multi strand is the outside-ground-rod wire, thin single 6GA is the water pipe bond wire) be placed on the same lug (green) on the Square D QO main svc panel (QO142M200PCAFVP)? I could put the waterpipe bond wire on one of the side ground bars, but if I don't have to, I want to leave it where it is.
That lug can’t be double-tapped.
Large wires can generally never be double tapped.
Check the labeling on your panel for the list of sizes allowed for double or triple tapping on which lugs. Don’t expect wires larger than #10 to be permitted.
You must obey panel labeling and instructions NEC 110.3B.
If your wire can’t reach, feel free to use the vacant screw hole just to the right of the main lugs to mount a lug e.g. a double lug. Electrical supply houses stock those. It is probably a #10-32 screw.
You can also drill your own holes, but must be -32 thread pitch or finer. Nobody ever got fired for using 10-32.
