PENETRATION OF STEEL CABLE TRAY

Supply and installation of protection for penetrations of steel cable trays containing electrical cables with certified EI 120 fire resistance in floor slabs, consisting of “GB-P” semi-rigid mineral fibre panels (density 150 kg/mc), 60 mm thk., treated on both sides with a layer of fire-protection coating, and intumescent fire pillows “GB-S”, made of sturdy non-combustible glass-fibre fabric containing thermo-expanding granular material, heat-insulating fillers and gradual water-release materials, in accordance with classification report I.G. 392776/4208FR. Measure the

dimensions and shape of the opening to be sealed, transfer them onto the panel and cut it, apply a small amount of firestop sealant “GB-MT” to the sides of the cut-out or directly onto the inner edge of the floor slab. Insert the panel sections into the opening with an “interference” fit, both on the underside and on the top side, and skim the joints with a spatula using the sealant “GB-MT”; the internal space of the cable tray must be filled with “GB-S” pillows to a depth of 120 mm, positioned flush with the underside of the floor slab, sealing the edges and any gaps with GB-MT sealant.