NFPA 262 / FT6 Steiner-Tunnel (UL 910 withdrawn)

Test set-up The cables are secured to a horizontal ladder in a single layer (quantity depends on the diameter of the cable). The length of each sample is 7.32 m. A device for measuring the smoke density is placed behind the combustion chamber.

Flame temperature

Determined by the stipulated quantity of propane gas and air. The power equals 86 kW (294,000 Btu/hr).

Test duration 20 minutes (2 tests to be performed)

Compliance criterion

The area of fire damage to the cables must not exceed 1.52 m. The mean optical density of the smoke produced must not exceed a value of 0.15. The maximum optical smoke density should not exceed 0.5 (light transmission of 32 %).

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