Effective cable tray fire protection often involves multi-component systems like firestop pillows, blocks, or composite sheets. These systems are designed to seal large, irregular openings while allowing for the future addition or removal of cables (a process called. Scope: Firestopping for busway, cable trays, cables, and trunking passing through walls in enclosed electrical installations. Where cables pass through shafts, walls, slabs, or enter electrical panels or cabinets, openings shall be tightly sealed with firestopping materials in accordance with. The following charts give the number of 3M pillows needed to completely firestop an opening that cable tray passes through. * Two (2) sticks of moldable putty (part number FSP-MPS) are also needed for each opening. UL Listed Systems Concrete Wall - C-AJ-4056 3 HR F-Rating, 3/4 HR T-Rating Gypsum. Cable penetration seal up to EI 120 for rigid walls, rigid floors and flexible walls. Through penetration firestop system for. SLIPSIL Sealing Plugs are an ideal solution for the fire-safe, gas and / or watertight sealing of penetrations carrying single or multiple pipes. In other words, the cable tray manufacturer did not go to UL or ETL and say “test this tray penetration for 2 hours, make the hole this size, and use these pillows, compressed this. A through-penetration firestop system is a specific field-erected construction of an assemblage of materials designed to prevent the spread of fire and its byproducts for a prescribed period of time through openings which are made in floors and walls to accommodate through penetrating items such as.