MDShunk

Metal studs have holes of various sizes and sorts. Some of the common configurations are:


You need to use some sort of bushing when wiring with Romex to comply with paragraph 300.4(B)(1) of the NEC, which states that: "in both exposed and concealed locations where nonmetallic-sheathed cables pass through either factory or field punched, cut, or drilled slots or holes in metal members, the cable shall be protected by bushings or grommets covering all metal edges and securely fastened in the opening prior to installation of the cable." Not all bushings will work with all types of holes in the metal studs. There are bushings available that are pretty universal:





This picture of metal studs from Derek Pasch, Staffing Specialist at Meisner Electric in Delray Beach, FL, begs the age old question. Why is there always one stud or two in a wall of perfectly aligned holes that doesn't line up with the rest?

acrwc10

It's a conspiracy. By the company that sells stud punchs. Or the EC is on T&M and slipped a buck to the framer.