Component line 06 / Linear heat detection cable
Digital linear heat detection cable, 100 V d.c., 68 / 88 / 105 / 138 °C
Fixed temperature cable for cable trays, busway runs, battery racks and concealed voids, with interface modules that supply and supervise the circuit. Supplied as components with terminators, junction boxes and clips. The circuit design and the zone arrangement belong to your designer of record.
Standard references only. Listing certificates are issued with their own document numbers, see Certification.
Four stocked thresholds, one cable construction, and an interface module that turns a short circuit into an alarm contact.
A detector that follows the cable instead of watching the room
A point detector protects the space around it. Linear heat detection protects a route. Run it along the tray, the busway or the battery rack and the alarm happens where the fault is, rather than wherever the airflow happens to carry the smoke.
The cable is a fixed temperature device. Two conductors sit behind a temperature-sensitive polymer, and at the rated temperature the polymer softens enough for the conductors to make contact, which the interface module reads as an alarm. There is no smoke sensing, no calibration and nothing to aim. The cable either reaches its rated temperature or it does not.
Engineering note · choose the threshold against the ambient
A fixed temperature cable has to sit above the highest ambient temperature it will ever see and below the temperature at which the protected equipment is damaged. That window is narrower than it looks in a plant room, and it is the reason four thresholds are stocked rather than one. The cable is also rated 100 V d.c., and the interface module supplies the circuit, so the rating is a limit on what can be connected rather than an operating voltage.
01 / Specification
Datasheets
| Type | Digital, fixed temperature, two or three conductor |
|---|---|
| Maximum rated voltage | 100 V d.c. |
| Thresholds stocked | 68, 88, 105, 138 °C |
| Imperial equivalents | 155, 190, 221, 280 °F |
| Construction | Copper conductors, temperature-sensitive polymer, helical wrap, outer jacket |
| Jacket options | PVC as standard, nylon or fluoropolymer for chemical and high temperature exposure |
| Armour option | Stainless steel braid for mechanical protection |
| Nominal diameter | 4 mm |
| Supply form | 100 m, 200 m and 500 m reels |
| Circuit length | Per the interface module, quoted against the zone layout |
| Function | Supplies and supervises the cable circuit |
|---|---|
| Alarm output | Volt free relay contact to the fire alarm panel |
| Fault output | Open circuit and short circuit supervision |
| Supply | 24 V d.c. |
| Termination | End of line terminator required at the far end |
| Mounting | Junction box or panel mount, IP54 |
| Panel compatibility | Conventional or addressable input |
| Threshold | Imperial | Normally chosen for |
|---|---|---|
| 68 °C | 155 °F | Conditioned spaces and cable trays in occupied areas |
| 88 °C | 190 °F | General cable tray and containment runs, moderate ambient |
| 105 °C | 221 °F | Plant rooms and locations with a higher standing ambient |
| 138 °C | 280 °F | High ambient industrial areas and hot process routes |
Guidance only. The threshold is selected by the designer of record against the maximum ambient at the cable and the temperature the protected equipment can survive.
| End of line terminator | One per circuit, at the far end |
|---|---|
| Junction box | For splices and module mounting, IP54 or IP66 |
| Splice kit | For repairing or extending a run |
| Clips and ties | Stainless clips, UV stable ties |
| Labels | Circuit identification along the run |
| Test heat source | For commissioning checks along the cable |
What this device is not
Linear heat detection does not respond to smoke and it does not detect a smouldering fault that has not yet produced heat. It complements smoke detection rather than replacing it. Where a project needs very early warning of an electrical fault before there is any heat, the aspirating or gas detection lines are the ones that answer that question.
02 / Model list
Model designations
Add what you need and the list is carried into the enquiry form. Give us the route lengths and the zone arrangement and the reel quantities follow.
| Model designation | Item | Threshold | Detail | Add to model list |
|---|---|---|---|---|
| EMS-LH-CBL-068 | Detection cable | 68 °C / 155 °F | PVC jacket, 100 V d.c. rating | |
| EMS-LH-CBL-088 | Detection cable | 88 °C / 190 °F | PVC jacket, 100 V d.c. rating | |
| EMS-LH-CBL-105 | Detection cable | 105 °C / 221 °F | PVC jacket, 100 V d.c. rating | |
| EMS-LH-CBL-138 | Detection cable | 138 °C / 280 °F | PVC jacket, 100 V d.c. rating | |
| EMS-LH-CBL-088F | Detection cable | 88 °C / 190 °F | Fluoropolymer jacket and stainless braid | |
| EMS-LH-IFM-01 | Interface module | Not applicable | 24 V d.c., alarm and fault contacts | |
| EMS-LH-EOL-01 | End of line terminator | Not applicable | One per circuit | |
| EMS-LH-JB-01 | Junction box | Not applicable | IP66, for splices and module mounting | |
| EMS-LH-SPL-KIT | Splice kit | Not applicable | For extending or repairing a run | |
| EMS-LH-CLIP-100 | Stainless clip pack | Not applicable | 100 clips with UV stable ties |
03 / Scope
What this line ships, and what it does not
Ships from us cable and modules
- Detection cable in all four thresholds, on 100 m, 200 m and 500 m reels
- Interface modules with alarm and fault contacts
- End of line terminators, junction boxes and splice kits
- Clips, ties, labels and the commissioning test heat source
- Datasheets, model list and the listing certificate with its document number
Not from us by others
- The zone layout and the circuit lengths
- Threshold selection against the ambient and the equipment rating
- Installation, clipping, splicing and cable routing
- Wiring to the panel and the address programming
- Commissioning and the acceptance test
04 / On site
Where linear heat pays for itself
- Cable trays and busway runs. A cable fire travels along the route. A cable that follows the route at the same length as the hazard gives an alarm at the point of the fault rather than at the point where smoke eventually collects.
- Battery racks. Clipped along the rack face, the cable sits where a failing cell produces heat, and it survives the corrosive atmosphere that shortens the life of an electronic detector.
- Raised floor and ceiling voids. Voids are awkward for point detection and easy for a cable that can be laid along the void without aiming at anything.
- High airflow and dirty areas. Dust, dirt and moving air defeat smoke detectors but do not affect a device that waits for a temperature. This is the reason it appears in plant rooms and industrial spaces.
- Locating the fault. A digital circuit reports the zone it is wired into. If the project needs the distance along the cable, that comes from the interface module selected for it, and the zone arrangement is what makes the report useful.
Engineering note · clipping matters more than people expect
The cable has to stay in contact with the surface it protects. A run that hangs loose on long ties responds later, because the air around it has to heat up before the cable does. Clip it against the tray, the rack or the structure at the interval in the installation instructions, and keep it clear of hot pipes that would cause a nuisance alarm.
05 / Questions
Linear heat detection, asked and answered
Does linear heat detection replace smoke detection?
No. It is a fixed temperature device and it does not respond to smoke. It follows the hazard along a cable run, which suits trays, busway, battery racks and voids. It complements smoke detection rather than replacing it.
What does the interface module do?
It supplies and supervises the cable circuit and converts the short circuit produced at the rated temperature into an alarm contact for the fire alarm panel, plus a fault contact if the circuit is broken. The end of line terminator at the far end is what allows the circuit to be supervised at all.
What does the 100 V d.c. rating mean?
It is the maximum voltage the cable is rated for, not its operating voltage. The circuit is supplied by the interface module at a low voltage, and the 100 V d.c. rating tells the designer the upper limit of what may be connected. It is a construction rating rather than a performance figure.
Which threshold should we choose?
The one that sits above the highest ambient temperature the cable will see and below the temperature at which the protected equipment is damaged. The four stocked thresholds cover most data centre and plant room conditions, and the choice is the designer's. If the window between ambient and damage is narrow, say so, because that is where the selection stops being routine.
Can the cable be repaired if it is damaged during installation?
Yes, with a splice kit, and the splice becomes part of the circuit rather than a break in it. Every splice should be recorded, because a circuit with several undocumented repairs is a circuit nobody can test with confidence later.
Linear heat detection cable
Send the route lengths and the zones
Give us the cable route lengths, the number of zones and the ambient conditions. The quotation comes back with reel quantities, interface modules and the accessory list for the routes.
- Rating
- 100 V d.c. maximum
- Thresholds
- 68 / 88 / 105 / 138 °C
- Imperial
- 155 / 190 / 221 / 280 °F
- Reels
- 100 m, 200 m, 500 m