| 摘要 |
The fire barrier assembly is comprised of a frame through which one or more electrical cables may be passed and a plurality of sealing elements clamped in the frame in contact with each electrical cable and the frame to provide an airtight barrier. Each element has a plate-like configuration and is comprised of an elastomeric body having intumescent material mixed therewith and opposing end members connected by bolts so that upon movement of the end members toward each other the elastomeric body will expand into intimate engagement with adjacent elements, the frame and each cable passing through the frame. Adjacent elements on opposite sides of an electrical cable are provided with complimentary grooves to define a cylindrical passage for each cable and additional filler elements may be provided without grooves. An external coating of intumescent material is applied to the outer surfaces only of the frame and end members to provide a heat insulating layer. |
