FM Products - Fire Rated Cable Clips
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Wiring regulations changed on 1st July 2015. Are you ready?
WHY do I need to do this?
In January, the 3rd Amendment to the 17th Edition updated the Wiring Regulations so ALL surface wiring systems within fire escape routes now require fire resistant fixings. The reason for change is to minimise the risk of any cables dropping during the early stages of a fire, so eliminating the hazard of entangling either people trying to evacuate the building, or firefighters tackling the blaze. This change follows the deaths of 8 firefighters where it was proven that they had become trapped by entanglement with fallen cables.
The amendments require all responsible persons (building design team and installers) to ensure that ALL types of cables, including electrical power/switching, IT/data, fire/security alarm, emergency lighting, TV coaxial and any telecoms are no longer secured using plastic clips or plastic trunking alone without sufficient fire resisting (steel) fixings. This also means no longer just using plastic wall plugs that may melt and fail in the event of a fire or even stainless steel cable ties that will fail at 538ºC.
Download the Fire Rated Cable Clip information sheet here: http://goo.gl/dlTHn7
The legislation within the new Wiring Regulation 521.11 calls for a method of fixing all cable categories
running within escape routes, such that they will not be liable to premature collapse in the event of fire.
In Note 2, it states that “a suitable fire-resistant means of support/retention must be provided”. Common sense tells us that using a standard plastic red plug is therefore unlikely to be a guaranteed and 100% reliable solution, since it will soften as the temperature in a fire rises.
There are 2 solutions to this issue which are fully compliant with the new legislation using fixings that already have up to 2hr fire-resistant certification. These are Wall Dog Screws and gas-fired nails.
The easy to use solution that is within reach of all installers is the Wall Dog Screws. We have had particular success in our own trials using the Wall Dog Screws.
The Wall Dog Screw works very effectively straight into timber and plasterboard where its wide and sharp flutes easily self-drill their way in. They also work well directly into Thermalite blocks and some of the softer brick and even concrete block types. Harder bricks and dense concrete blocks are best drilled out first with a 4mm pilot hole to 35mm depth. The Wall Dog Screw will then pull in tightly to give a good firm fixing.
For engineering bricks, concrete and even steel reinforced concrete, the best solution when using the Wall Dog Screw is to make a 5mm pilot hole - again to 35mm depth. Wall Dog Screws work well when fixed either directly to substrate or through PVC trunking (25mm to 50mm sizes). Simply drill the pilot hole straight through the pre-formed hole in the clip, the back of the trunking and directly into the wall behind.
If you have larger numbers of fixings to make in one go, particularly straight onto brickwork, blockwork or concrete, then gas nailing is the way to go. In trials, a DeWalt® C5 gas nailer with 25mm XC nails was used. Once set up, the gun will fix nails straight through the pre-formed hole or even through the clip itself regardless of the density of the substrate. Using the harder XH nails even allows for fixing directly to steel work if that is the way the circuit is routed.
FM Products Clips Fire-Rated have been fully tested by Exova Warrington Fire to BS5839 Part 1.
The certified results allow the Fire-Rated clip range to be used in ALL applications of cable retention, even up to 120 minutes for enhanced FP Cable. The clips fit within plastic trunking up to 50 x 50mm – the small/medium clips even work in multi-compartment trunking too! The clips are fixed THROUGH the trunking before cabling up takes place.
Fixing spacing is determined by the type of cable being used; BS7671 suggests following cable manufacturer’s data sheets – 400mm vertical and 300mm horizontal intervals meets any and all types of cable