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Flammability Tester

Flammability Tester

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Description

Laboratory Flame Retardant Test Apparatus For Electric Cables

As per IEEE Std. 383-1974

Scope:

Covers a method to assess the ability of grouped electric power control and instrumentation cables via the vertical tray flame test to determine their relative ability to resist fire.

Significance:

The fire test should demonstrate that the cable does not propagate fire even if its outer covering and insulation have been destroyed in the area of flame impingement.


Apparatus:

Test should be conducted in a naturally ventilated room or enclosure free from excessive drafts and spurious air currents. The vertical tray configuration is recommended as the best arrangement to establish whether or not a cable could propagate a fire. The tray (ladder) is a vertical metal, ladder type, 3 inch deep, 12 inch wide, and 8 ft long. The ladder is bolted at the bottom to a length of horizontal tray for support.

Flame source:

The ribbon gas burner shall be mounted horizontally such that the flame impinges on the specimen midway between the ladder rungs, and so that the burner face is 3 inch behind and approximately 2 ft. above the bottom of the vertical ladder. The flame temperature should be approximately 1500 °F (815°C) when measured by a thermocouple located in the flame close to, but not touching the surface of the specimens (about 1/8 inch spacing). Under dynamic condition, if propane gas is used the pressure shall be --2.6 ± 0.3 cm of water at the supply side A to the Venture mixer. If commercial gas is used the pressure shall be – 0.9 ± 0.1 cm of water when measured at the supply side of the Venture mixer. For propane gas, the air pressure should be 4.3 ± 0.5 cm of water, measured at the air inlet B to the mixer.