Because ordinary cables and wires release a lot of harm gas when burning. Therefore, flame-retardant and fire-resistant cables have been widely used in recent years.Smokeless and halogen-free, low-smoke and low-halogen products are used in various industries. Increasing proportion,the international standards for flame retardant cables or materials have been fully updated. The international standards for flame retardant cables are divided into two major systems.The first is the European system (including IEC, ISO, BS and other standards), and the second is the American system (including UL, ASTM, AEIC, and other standards). The biggest difference between the two systems is the vertical burning test of the bundled cable

UL1666 simulates the combustion of multiple cables laid vertically in a ventilation shaft,Higher requirements for the flame retardancy of cables,In addition UL910 involves fire tests in horizontal tunnels,there is no such aspect in European standards.

UL flame retardant standards Any cable listed in UL has been tested and verified to meet a certain fire rating,can be printed with UL identification, fire rating and approval number on the cable

◎Booster grade-CMP grade (Supply air combustion test / Steiner tunnel furnace fire test, this is the highest demanding cable in the UL fire protection standard. UL910 is the applicable safety standard,the test requires laying multiple specimens on the horizontal air duct of the device, use a 87.9KW gas Bunsen burner (300,000 BTU / Hr) to burn for 20 minutes,the eligibility criterion is that the flame must not extend beyond 5 feet from the flame front of the gas Bunsen burner.The maximum optical density peak is 0.5, and the average density value is maximum 0.15,this CMP cable is usually installed in air return pressure boosting systems used in ventilation ducts or air handling equipment, and is approved for use in Canada and the United States.FEP / PLENUM material according to UL910,flame retardant performance is better than the low-smoke halogen-free materials apply to IEC60332-1 and IEC60332-3,lower smoke concentration when burning

 Referenced standards

NFPA 262 -2007: Standard Method of Test for Flame Travel and Smoke of Wires and Cables for Use in Air-Handling Spaces

UL 910 : UL Standard for Safety Test for Flame-Propagation and Smoke-Density Values for Electrical and Optical-Fiber Cables Used in Spaces Transporting Environmental Air

 

Recommend Furnace Chamber: SKYLINE SL804 Steiner Tunnel Test Apparatus

Furnace type: Steiner horizontal tunnel furnace

 Furnace main dimensions: Furnace size 7620mm * 451mm * 305mm

 Number of furnace covers: Steiner horizontal tunnel furnace: 1 furnace cover

 Furnace working temperature: up to 600 ℃ (flue gas temperature)

 Fuel: Methane with a purity of at least 95%

 Fuel calorific value: 3500btu / lb

 Fuel pressure: 0.4-0.5MPa

 Burner model: 3/4 inch U-shaped double burner

 Exhaust temperature of flue pipe: <250 ° C, usually the flue gas temperature is controlled within 200 ° C.

 Test method of the tested object: Horizontal component furnace-furnace ceiling hoisting

 Control the temperature rise and furnace pressure of the UL910 / NFPA262 heating curve