In accessible attics, when must exposed cables be protected by guard strips?

When exposed cables are run across the top of joists or the face of studs in accessible attics, they must be protected by guard strips to ensure safety and compliance with electrical codes. The purpose of the guard strips is to prevent physical damage to the cables, which could occur due to other activities in the attic, such as walking or storing items.

Attics can be areas of maintenance or other activity, and wires that are left unprotected in these locations are at risk of being disturbed or dislodged. The guard strips serve as a protective barrier, reducing the likelihood of any accidental contact that could damage the insulation of the cables, potentially leading to electrical hazards.

In contrast, while cables run across rafters also require some consideration for protection, protective measures may not be as strictly defined as in the case of cables laid across joists or studs. Additionally, the proximity of cables to outlets or being buried under insulation does not warrant the same direct need for guard strips, as these situations have other safety considerations or regulations that apply.