What is the minimum distance required between boxes in the same wall cavity of a fire-rated wall?

The minimum distance required between boxes in the same wall cavity of a fire-rated wall is 24 inches. This specification is primarily aimed at maintaining the structural integrity and fire-resistive properties of the wall assembly. By placing the boxes at least 24 inches apart, it helps to reduce the potential for fire to spread through the wall or for electrical circuits within the boxes to interfere with each other. In addition, this spacing helps ensure that the fire-rated wall remains effective in preventing the passage of smoke and flames between adjacent spaces.

Furthermore, fire-rated walls are designed with specific building codes and safety regulations in mind, and keeping the appropriate distance between boxes is part of complying with these requirements. This practice is important to maintain the overall safety of electrical installations in fire-rated structures.