I recall a rule in the Massachusetts admendments that did in fact call for bonding in the same manner described by Tony.
I can't seem to find it though, and have posted the link to that code here so someone could read it through to see if the rule can be found.
www.joetedesco.com/masscode.pdf I believe that someone in Massachusetts was electrocuted by an energized metal stud.
PS; That's also one of the reasons why the temporary wiring rules were changed to require cords to be used on construction sites, because someone back a few years in Pennsylvania was also electrocuted when a hot leg energized metal studs.
