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Step 1
If the walls inside the conduit opening exhibit large irregularities, they should be locally smoothed with NOFIRNO® fire safe sealant. Otherwise insufficient smoke tightness will be obtained. |
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Step 2
The cables can be ducted through the conduit opening in random order. It is most important that they are not pulled too tight in order not to hamper their separation at a later stage. |
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Step 3
ACTIFOAM® rubber sheets are cut into strips fitting to the size of the walls inside the conduit opening and the expected height of the cable set. For this purpose sheets with a thickness of 25 mm are used. |
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Step 4
The ACTIFOAM® rubber sheets can easily be cut to size with a sharp knife. ACTIFOAM® rubber sheets are supplied in a variety of sizes, widths and thickness. |
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Step 5
An ACTIFOAM® rubber sheet must also be placed in the conduit opening underneath the layer of cables. A band is placed around the cable bundle to lift the bundle of cables. |
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Step 6
A slightly oversized strip of ACTIFOAM® rubber with a thickness of 25 mm is placed inside the conduit opening underneath the cables. The sheet should fit snugly between the sheets against the side walls. |
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Step 7
One layer of cables is spread out on the ACTIFOAM® rubber sheet at the bottom of the conduit opening. The other cables are lifted to make room for further finishing the first layer.
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Step 8
For proper cable separation, square profiles are torn off the pre-slit ACTIFOAM® rubber sheets. The sizes of the profiles should be equivalent to the cable diameters. |
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Step 9
Profiles are slit in sizes of 10x10, 15x15, 20x20 and 25x25 mm. This enables an easy fit for corresponding cable sizes. Cables larger than 25 mm should be separated by a minimum of 25 mm. |
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Step 10
Adjacent to the first layer of cables and profiles, one or more extra sheets of ACTIFOAM® rubber are fitted to create a level layer for further filling the conduit opening.
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Step 11
An intermediate ACTIFOAM® rubber sheet is inserted in the conduit opening on top of the levelled first layer. The thickness of the intermediate layer is dependent on the maximum cable diameter. |
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Step 12
The next layer of cables is spread out and in the same way as with the first layer of cables, the cables are separated with the ACTIFOAM® pre-slit profiles and levelled with one or more ACTIFOAM® sheets. |
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Step 13
The remaining space between the sheets, placed against the walls, is filled with one or more ACTIFOAM® sheets. All sheets should fit tightly in the conduit opening to obtain a fair degree of smoke tightness. |
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Step 14
A fire safe compression plate is placed on top of the ACTIFOAM® filling to obtain controlled expansion during fire exposure. The plate is also needed to compress the ACTIFOAM® filling in order to improve tightness. |
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Step 15
A NOFIRNO® coated board is cut to size and tightly fitted into the open space of the conduit opening. The NOFIRNO® board should be a bit oversized in height with a view to compress the ACTIFOAM® filling.
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Step 16
Depending on the required fire rating a single NOFIRNO® board coated on both sides can be inserted in the conduit opening. For higher fire ratings two boards coated on one side only can be placed on top of the compression plate. |
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Step 17
The NOFIRNO® board is sealed all around with NOFIRNO® sealant to obtain optimum tightness and to avoid dehydration of the mineral wool. This will also improve mechanical stability. The NOFIRNO® sealant is to be applied at both sides of the penetration. The sealant can be smoothed by hand. |
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Step 18
The finished NOFIRNO® - ACTIFOAM® multi-cable penetration. For adding extra cables the NOFIRNO® board can be removed and the fire safe plate compression plate lifted. The ACTIFOAM® filling allows easy access for ducting more cables. |
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Step 19
The finished NOFIRNO® - ACTIFOAM® multi-cable penetration with a single NOFIRNO® board coated on both sides. Fire rating is dependent on the wall thickness and the amount of NOFIRNO® boards applied. |
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Step 20
The finished NOFIRNO® - ACTIFOAM® multi-cable penetration with two NOFIRNO® boards coated on one side only. Fire rating is dependent on wall thickness and the amount of NOFIRNO® boards applied. |