Cable trays are one of the most critical yet often overlooked fire-risk zones in modern industrial and commercial facilities. They carry large bundles of power, control, and communication cables over long distances—meaning that if a fire starts, it can rapidly travel along the entire cable route and disrupt essential operations.
To address this challenge, Hazenfire UL Listed Linear Heat Detection System delivers reliable, continuous fire monitoring specifically designed for cable tray environments where traditional detectors fall short.
Why Cable Tray Fire Protection Matters
Cable trays are widely used in power plants, factories, data centers, tunnels, oil & gas facilities, and commercial buildings. These systems often run through hard-to-access areas such as ceilings, underground corridors, and dense equipment rooms.
The major fire risks include:
- Electrical overload and overheating
- Short circuits and insulation failure
- Loose or aging cable connections
- Heat buildup in tightly packed cable bundles
- Rapid fire propagation along cable routes
- Difficult inspection and maintenance conditions
Traditional point-type smoke or heat detectors can only monitor a single location, leaving large sections of cable trays unprotected. This is where linear heat detection becomes a game-changer.
The Hazenfire Solution: Continuous Heat Detection
The Hazenfire Linear Heat Detection System is designed to provide full-length protection along cable trays and critical electrical routes.
Instead of monitoring a single point, the sensing cable itself acts as a continuous detector—allowing it to identify overheating at any location along the entire route.
This makes it ideal for long cable runs, industrial corridors, and environments where fire risk is distributed rather than localized.
How the System Works
Hazenfire Linear Heat Detection operates on a fixed-temperature sensing principle.
Inside the cable are two conductors separated by a heat-sensitive polymer material. Under normal conditions, the circuit remains stable. When any section reaches its rated alarm temperature, the material reacts, creating a short circuit between the conductors.
This change is instantly detected by the interface module, which sends a fire alarm signal to the Fire Alarm Control Panel.
Key advantages of this detection method:
- Instant response at the exact overheating point
- Uniform sensitivity across the entire cable length
- No calibration required after installation
- Stable performance in industrial environments
System Components Overview
A complete Hazenfire Linear Heat Detection setup includes three core components:
1. Linear Heat Sensing Cable
The sensing cable is installed directly along the cable tray or protected route. It continuously monitors temperature changes along its entire length.
Available alarm temperatures include:
68°C, 88°C, 105°C, 138°C, and 180°C
This allows precise matching with different environmental conditions.
2. Interface Module (AT-LHMI Equivalent)
The interface module acts as the control bridge between the sensing cable and the fire alarm system.
It operates on 24 VDC power and continuously monitors cable status, providing:
- Alarm signal output
- Fault detection
- System supervision
Technical highlights include:
- Operating voltage: 16–28 VDC
- Low standby power consumption
- IP66 protection housing
- Industrial-grade aluminum enclosure
- Reliable integration with fire alarm panels
3. End-of-Line Unit
The end-of-line device ensures proper circuit supervision and system stability.
It requires no power and helps maintain continuous loop integrity, ensuring accurate fault and alarm detection.
Selecting the Right Alarm Temperature
Choosing the correct alarm temperature is essential to avoid false alarms while ensuring early fire detection.
| Alarm Temperature | Recommended Maximum Ambient | Application |
|---|---|---|
| 68°C | up to 45°C | Indoor cable trays, office buildings |
| 88°C | up to 60°C | Industrial environments |
| 105°C | up to 75°C | High-temperature equipment areas |
| 138°C | up to 93°C | Heavy industrial zones |
| 180°C | up to 121°C | Extreme heat environments |
Proper selection ensures a balance between sensitivity and operational reliability.
Cable Types for Different Environments
Hazenfire offers multiple cable constructions to match environmental challenges:
Standard Type
Ideal for general indoor use such as electrical rooms, control panels, and factory cable routes.
CR/OD Type (Outdoor & Corrosive Environments)
Designed for harsh conditions including UV exposure, moisture, chemicals, and salt spray. Suitable for coastal plants, chemical facilities, and outdoor cable trays.
EP Type (Hazardous & EMI Environments)
Built with stainless steel braid for electromagnetic shielding and static protection. Recommended for oil & gas, mining, petrochemical, and explosive-risk areas.
Key Benefits of Hazenfire Linear Heat Detection
Complete Route Coverage
Protects the entire cable tray instead of limited point locations.
Early Fire Detection
Identifies overheating at the exact source before fire spreads.
Ideal for Industrial Environments
Performs reliably in dust, humidity, vibration, and airflow-heavy areas.
Easy System Integration
Works seamlessly with fire alarm control panels using standard 24 VDC interfaces.
Low Maintenance Design
No recalibration required after installation.
Flexible Configuration
Multiple temperature ratings and cable types available for different project needs.
Typical Applications
The Hazenfire Linear Heat Detection System is widely used in:
- Power generation plants
- Transformer and switchgear rooms
- Industrial cable tray systems
- Oil & gas facilities
- Petrochemical plants
- Mining operations
- Railway and road tunnels
- Airports and logistics systems
- Solar energy installations
- Large commercial infrastructure
Engineering Considerations
When designing a cable tray protection system, engineers should evaluate:
- Ambient temperature conditions
- Cable tray layout and length
- Environmental risks (dust, moisture, corrosion)
- Correct alarm temperature selection
- Cable type selection (Standard, CR/OD, EP)
- Integration with fire alarm control panel
- Proper grounding (especially for EP type)
- End-of-line placement and supervision design
- Mechanical protection for exposed routes
Careful planning ensures maximum reliability and minimal false alarms.
Conclusion
Cable tray fires can escalate rapidly and cause severe operational damage. Traditional detection systems often fail to provide full coverage in these complex environments.
The Hazenfire UL Listed Linear Heat Detection System offers a smarter approach—delivering continuous, reliable, and early fire detection along the entire cable route.
It is a practical, scalable, and industrial-grade solution designed for today’s high-risk infrastructure environments.
