Architectural · A-ABZ2E

Bus Duct and Cable Penetrations through Rated Assemblies

Materials

Concrete Steel Metal (misc.)Gypsum / Drywall

Elements

Partitions Floors / Slabs Insulation Connections / Plates

About this detail

Electrical and mechanical penetrations pass through fire-rated assemblies, including a bus duct through a concrete floor structure and a cable or outlet box through a rated gypsum board partition. The floor penetration features a metal sleeve or cored hole packed with fire safing insulation and fire-rated sealant around the cables, complying with maximum three-hour ratings such as UL C-AJ-3030. The wall partition detail includes acoustical insulation within the stud cavity, continuous acoustic sealant around the metal electrical or telephone outlet box, moldable firestopping, and a fire blanket insulation fill behind the box.

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