wrong, path of least resistance...if you have a 10ft run of 1/0 that is 0.001ohms (if memory serves)
the resistance of the frame can be alot higher than that. say 0.02ohms. Under daily situations and smaller current draws 0.02ohms isnt a big deal. When you are chasing tenths on the mic or drawing hundreds of amps 0.02ohms can become an issue.
If you have a run of 0/1 and the frame your total resistance is only a mere 0.00095ohms... that is 21 times more conductive than just the frame //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif