ASTM D2257 Flame Retardancy Test for Insulated Cables
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The Flame Retardancy Test for Insulated Cables is designed to evaluate the ability of mineral-insulated cables and cables with fire-resistant layers to maintain circuit integrity under flame exposure. The apparatus subjects the test sample to a controlled gas flame under specified temperature, time, and electrical loading conditions, monitoring for short circuits or open circuits. This allows assessment of the cable’s fire-resistance performance. The system is suitable for type tests, factory inspections, and research verification of fire-resistant cables.
Standards
The apparatus is designed to comply with and support the following standards:
GB/T 19216-2008 — Test methods for cable or optical fiber circuit integrity under flame conditions
GB/T 19666-2019 — General requirements for flame-retardant and fire-resistant wires and cables
IEC 60331-2009 — Tests on electric cables under fire conditions
BS 6387 — Performance requirements for maintaining circuit integrity of cables under fire conditions
BS 8491 — Assessment methods for fire-resistance of cables
Technical Specifications
| Item | Technical Specification |
|---|---|
| Test Station | Single station (one sample at a time) |
| Sample Length | ≥1200 mm |
| Burner Type | Ribbon propane burner with Venturi mixer |
| Burner Nominal Length | 500 mm |
| Gas Flow Rate | 0–50 L/min (adjustable) |
| Gas Flow Accuracy | ±0.1 L/min |
| Air Flow Rate | 0–200 L/min (adjustable) |
| Air Flow Accuracy | ±5 L/min |
| Flame Temperature Range | 450–950 °C (adjustable) |
| Temperature Sensors | K-type stainless steel thermocouples ×2 |
| Thermocouple Max Temperature | ≤1100 °C |
| Control Method | PLC + touchscreen operation |
| Power Consumption | 3 kW |
| Power Supply | AC 380 V ±10%, 50 Hz, three-phase five-wire |
| Gas Supply | Propane / LPG + compressed air |
Testing Principle
During the test, the mass flow controller precisely adjusts the gas-to-air ratio, producing a stable and controllable high-temperature flame. The test cable is subjected to continuous flame while all cores are energized at rated voltage and a load current close to 0.1 A.
A continuous monitoring system observes the circuit status in real-time. Any short-circuit or open-circuit condition triggers an immediate signal, allowing evaluation of whether the sample maintains circuit integrity under the specified flame and loading conditions.
Accessories and Consumables
| Category | Name | Description |
|---|---|---|
| Standard Configuration | Tubular gas burner | Suitable for fire-resistance and water-spray fire tests |
| Mass flow controller | Precision control of gas and air | |
| K-type thermocouple | Temperature monitoring | |
| Continuous monitoring device | Includes transformer and indicator lights | |
| Exhaust assembly | Rapid exhaust of combustion gases | |
| Optional | Water-spray fire device | Complies with BS 6387 W-class |
| Mechanical impact device | Complies with BS 6387 Z-class | |
| Consumables | Gas | Propane or LPG |
| Test cable | Test specimen | |
| Seals | Periodic replacement required |
Applications
Based on practical applications of domestic and international fire-resistant and flame-retardant cable testing equipment, this apparatus is suitable for the following products and scenarios:
Mineral-insulated cables (MI cables)
Power cables with fire-resistant layer structures
Fire-resistant building wires
Low-voltage control and signal cables
Fire-resistant optical fibers and composite cables
Fire-resistant cables rated ≤ 450/750 V
Verification of fire, flame-retardant, and water-resistant fire performance
Applicable users include cable manufacturers, electrical inspection agencies, fire safety product testing centers, research institutes, and third-party laboratories.
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