I would say that the unfortunate dryer installer's death constitutes a compelling 'track record of a problem.' While the problem (electrifying the studs) requires some very unusual circumstances to manifest itself (errant drywall screw piercing an improperly installed piece of romex), the risks are sufficiently grave to justify a regulatory response. All metal studs should be grounded. This is easily done, either with a metal box or jumper of some sort. From a cost/benefit perspective, it is a low cost/high benefit situation.

Last edited by Bigplanz; 03/19/09 12:49 PM.