I learned it in a HS adult ed course taught by an electrical inspector. *He
was perfectly clear that the only acceptable ground union was a crimp,
though he didn't know why.-

If the only acceptable ground is a crimp, then why do they make
"greenies", the green wirenuts with a hole in the end for running one
of your grounds out the other end to attach to a device?

http://www.idealindustries.com/prodD...d=30-292&div=7

Ken