I opened up my panel and ran a green wire for ground (14 solid awg) from the grounding bar up through the floor into my office in order to ground an existing outlet. I have also done some grounding where I tapped into an existing grounded outlet in the basement (newer wiring down there) and ran a green wire up to other previously non-grounded outlets.
The only issue I have noticed is on the second senario, and it may be due to the ground coming from one circuit (18) and being tapped into for an outlet on another circuit (6). I find the outlets on both 18 and 6 that have been upgraded to GFCI are tripping every few days.
Is what I have done acceptable? I am in Wisconsin, USA.