A neighbor is having a "gut job" done on his house--now it is down to the bare wood.

The contractor is putting in fireblocks in between the existing studs (this is an old house, no fireblocks were used originally) before the electrician comes in to completely rewire the house, before the sheetrock goes up. (By fireblocks, I mean 2x4s that are cut to fit in horizontally between the studs.)

I got to thinking (yeah, I know, thinking can be dangerous)...if the electrician is possibly going to need to drill through fireblocks, doesn't that open a whole can of worms, in that that the fireblock is then compromised? Does the electrician need to seal around the cable to completely fill the hole, or does this apply only to commercial dwellings?

I can't imagine that the guy is going to have to seal every hole drilled vertically yet I find it ironic that an area with electric cable would have holes in the fireblock...