Canada Electrical Trade Practice Exam

The correct distance for AC-90 cable when run through metal studs is indeed 32 mm from the edge of the stud. This requirement is put in place primarily to protect the cable from physical damage. When cables are installed in close proximity to the edges of metal studs, there is a risk that sharp edges could compromise the cable's insulation, leading to short circuits or electrical faults.

Maintaining a distance of 32 mm ensures that the cable is adequately protected within the stud framing, aligning with safety codes designed to reduce the potential for electrical hazards. This specification is crucial in ensuring not only the longevity of the cable but also the overall safety of the electrical installation. Different distances apply to various types of cable and installations, which is why it's important to be familiar with the specific requirements for AC-90 to ensure proper adherence to local electrical codes and standards.