Steve Barker wrote:
The wires should have been pushed back further. If they'd been back even a
half inch, the bit wouldn't have touched them. Granted, there's no reason
to have the bit INSIDE the box, but some people locate them that way.


You aim for the center of the box, route across until you hit the inside
edge, hop over said edge, and then route it out. I don't know anyone who
would (or could) punch through on the outside edge of the boxes with any
speed or consistency. If you're off by 1/2" you're either in the box
(which you're saying is a bad thing) or you've created a cut that has to
be fixed by the taper.