On 30 Jan 2007 20:07:57 -0800, wrote:

Plastic boxes. Another example, two gang box with two mid run 4 way
switches, each again on a separate circuit
plastic box, connect only the grounds from each circuit separately
correct??

I guess my real question would be, won't mixing grounds from separate
circuits cause more problems than it would
solve?

If there's any current on the ground, you've already
got problems. The ground wire is only there to keep
that problem from killing you before you fix it.