Fire Survival Cables (Low-smoke Halogen-Free-LSHF) are used in various indoor and outdoor Applications in which maintenance of power supply during a fire is required and in areas where smoke and acid gas evolution could pose a hazard to personal or sensitive equipment in high-rise building, schools, hospitals, hotels, shopping centers, subway etc.
Electrical cables and wires are a significant fire safety issue in today’s buildings and installations:
If the insulating or jacketing materials in cables catch fire, they can represent a significant quality of fuel for fire, because of the sheer volume of cables in modern building (electrical, telephone, computer connections etc.)
WHY USE AVOCAB LSZH / FRLS CABLES AND WIRES
Eliminates the threat of forming caustic acids (such as hydrochloric acid) and contributes to less corrosion damage to equipments near the fire.
Eliminates the threat of inhaling toxic gasses which reducing the damage to the human respiratory system.
No release of dense smoke that impairs visibility of the fire exit routes and hampers rescues operations.
It takes much more time than traditional cables to catch a fire, which facilitating the evacuation procedures.
Its excellent flame retardant property prevents the fire from spreading through the place.
TESTING PROCEDURE FOR FIRE SURVIVAL CABLES:-
This test is intended to evaluate cables which are designed as fire survival cables to be used for fire alarm circuits, emergency lighting, and cables for other emergency services. The test establishes whether a cable can maintain electrical circuit integrity for a time up to 3 hours at temperatures ranging from 650 °C up to in excess of 950 °C. The energized cable (at the rated voltage) is mounted horizontally in a test chamber and is exposed to a gas flame from a ribbon type burner, adjusted to give the appropriate temperature. There are many variations of this test using different conditions and a cable is rated depending on how the cable performs in the various categories. These categories can be summarized as follows:
IEC 60331-21: Cables are subjected to fire at 750 °C for 90 minutes followed by a 15 min cooling period.
BS 6387 (Category A): Cables are subjected to fire at 650 °C for 180 minutes.
BS 6387 (Category B): Cables are subjected to fire at 750 °C for 180 minutes.
BS 6387 (Category C): Cables are subjected to fire at 950 °C for 180 minutes.
BS 6387 (Category S): Cables are subjected to fire at 950 °C for 20 minutes (short duration).
Performance of Cables in the Event of Fire Resistance to Fire with Water
BS 6387 (Category W): Cables are subjected to fire at 650 °C for 15 minutes, then at 650°C with water Spray for further 15 minutes.
Resistance to Fire with Mechanical Shock : Cables are subjected to fire at 830 °C with mechanical shock for 120 minutes.
BS 6387 (Category X): Cables are subjected to fire at 650 °C with mechanical shock for 15 minutes.
BS 6387 (Category Y): Cables are subjected to fire at 750 °C with mechanical shock for 15 minutes.
BS 6387 (Category Z): Cables are subjected to fire at 950 °C with mechanical shock for 15 minutes.
The cable will possess the characteristics for providing circuit integrity so long as during the course of the test; the voltage is maintained i.e. no fuse fails or circuit-breaker is interrupted and a conductor does not rupture, i.e. the lamp is not extinguished.
Solid / Stranded Copper conductor lapped with Glass Mica tape, insulated with XLPE to form a core. Cores laid up together to form a power cable / control cable / Instrumentation cable with fire survival properties.
Conductor: Copper bare or tinned. Circular or sector shaped with Glass Mica tape.
Insulation : XLPE / LSZH
Inner sheath: FRLS
Amour: Wire or Strip
Outer Sheath : FRLS / LSZH
- To maintain circuit integrity during the Fire.
- Standard Specifications: IS / IEC / BS.
- Range Copper 1.5 SQMM to 400 SQMM
- Special Characteristics: Withstand flame temperature of 750 degree centigrade up to 3 hours without electrical breakdown at rated voltage.
- Does not produce noxious smoke, propagate flame & fumes which hinder fire fighting and endanger life.
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