Good catch.
Details matter!
Where does the 2" dimension come from?
That is the distance for horizontal members, for vertical members it’s 1.25" from the edge. @gromicko
Where holes are bored in studs and vertical framing members for cables and nonmetallic wiring methods, the nearest edge of the hole must be at least 11/4 inches (32 mm) from the edge of the framing member. This is to help prevent a nail or screw from penetrating the wiring installed through the holes. Where this is impossible, a steel plate at least 1/16 inch (1.5 mm) thick must be installed over the framing member where the wiring passes through. However, protection plates that are listed for the purpose may be more or less than 1/16 inch in thickness.
Building code provisions require that the outer edges of holes drilled in horizontal framing members must be at least 2 inches (51 mm) back from the member edge. This requirement is to prevent weakening of the structural members such as floor joists. See Section R502.8 and Figure R502.8 of the code for details of drilling and notching provisions for structural floor members. This requirement is included in Table E3802.1.
So those are horizontal structural studs in the graphic? Also with standard 2x4 studs the hole cannot be in the center of the stud and still be 2" from either stud face.
Those are vertical members. The boring holes were in vertical members. Jeffrey pointed out the inconsistency, Robert.
Got it. They called it horizontal framing members so that’s where the 2" came from. It should be 1.25".
The vertical on the knee wall would sit on the joist. This shows the joist stopping at the knee wall.
Image updated. Hit refresh: Attic Wiring - Inspection Gallery - InterNACHI®
Thanks!