Linear heat detection cable
Detection along cable trays, conveyors, car park decks and tunnels, where the detector is the cable and it sees the fire anywhere along its length.
- Scope
- Survey → commissioning → AMC
- Typical use
- Cable galleries, conveyors, tunnels
The detector runs the whole length of the risk
Some risks are long and thin. A cable tray runs a kilometre through a plant; a conveyor runs from a stockpile to a crusher; a car park deck, a cable gallery, a tunnel, a baggage line — none of them is a room that a ceiling detector can watch. Linear heat detection covers them by making the cable itself the sensor, fixed directly to or above the thing being protected.
Two kinds are in common use and they answer different questions. Digital cable is a pair of conductors under a heat-sensitive polymer: at the rated temperature the polymer yields anywhere along the run, the pair shorts and the panel sees an alarm. It is cheap, robust and simple, and it tells you there is a fire on that run. Analogue and fibre-optic sensing goes further and reports the temperature profile along the cable, so the panel can locate the hot spot to within a few metres and alarm on rate of rise as well as absolute temperature.
Choosing between them is a matter of how much the location is worth: on a short tray run, knowing the tray is enough; on a two-kilometre conveyor or a road tunnel, knowing which metre is the whole point. We survey the route, select the type and temperature rating against the ambient the run actually sees, install it with the fixing centres the cable requires, interface it to the fire panel and heat-test it at commissioning.
What the installation is built from
The cable, its interface, and the fixings — which matter more than they sound, because a sagging cable does not sense where you think it does.
Tell us about the project
Send the drawings or the BOQ and we will price it line by line. Most enquiries start with a site visit, because the site decides the system — not the catalogue.