Place the wrap on each side of the breached wall and around the tray and cables, filling any large openings between the cables and the tray. 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. Fireproofing Measures for Cable Trays Galvanized steel,Stainless steel,Fire-resistant coated trays,Flame-retardant plastic composites. Flame-retardant plastic composites. * 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. Effective protection of cable systems around the world: our tried-and-tested FLAMMOTECT-A and DG-CR 0. 7 products are successfully used to protect cables in high-rise buildings, industrial buildings, and offshore facilities as well as in sensitive areas, such as hospitals, airports, production. Firestopping cable trays is particularly difficult because of the irregular size and shape of the opening and the need to seal around the tray and any cables contained within it.