As a foreman I sometimes encountered idiot apprentices who thought that our rough pulls existed so that they could earn trim scrap.
They ended up getting canned.
Short wires = more expensive work.
Yes, I've even had to re-pull conductors. ( rare )
Short taps = fumbling trim-out -- especially if apprentices.
If short taps occurred during wire pulls/ cable runs corrections were made promptly.
More generally, I never permitted any rough-in or separation to push the envelope of the NEC. Too expensive -- a route to poverty.
ONE example out of many: built up a 5,000kVA transformer room in the rough. Primary at 21.6kV Secondaries at 480Y277 and 208Y120.
Just imagine how many feeders ( 6" on primaries on down to 1.25" and 1" !! ) I allowed for an extra 1" clearance on stubs under the massive panel boards/ distribution sections.
Later, found out that the office had given us numbers in error! They were off by 1" ! I'd made it, though. My design margin had saved 850 man-hours. ( Ripping up the work encased in concrete 4 feet deep to move the pipes back into the room. )
Similar attitudes have saved my bacon WRT transformers, panel boards, the works.
If you are down to shaving inches off at j-boxes -- you are far gone. That's NOT where you make it. ( You can break it there, though. )
Last edited by Tesla; 05/18/11 04:34 AM.