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IEC60331----- Tests for electric cables under fire conditions – Circuit integrity
This test is carried out to verify circuit integrity even during a fire. A sample of cable is held horizontally over a ribbon flame at about 750 °C. A test voltage is applied continuously for a period of a minimum of 90 minutes to the cable and no break or short circuit should occur in the cable.
IEC 60331-11 Apparatus – Fire alone at a flame temperature of at least 750 °C
IEC 60331-23 Electric data cables
IEC 60331-21 Cables of rated voltage up to and including 0.6/1.0 kV
IEC60331- FLAME PROPAGATION TESTS on electric cables under fire conditions
Part 1: Tests on a single vertical insulated wire or cable
Part 3: Tests on bunched wires and cables under fire conditions.
Cables form a complex matrix in every building, traversing walls and ceilings to create a web of electrical power. Unfortunately, these cables also act as conduits for fire and heat, so cables must be fashioned of inflammable and self-extinguishing components.
This can be achieved by utilizing a protective material containing aluminum hydroxide. In the event of a fire, the material releases water crystals, and at the same time produces water vapor, which stops the entrance of oxygen and snuffs out the flame.
The IEC 60332-3 specification creates a realistic fire situation, and specifies methods for assessing the flame retardance of bunched cables with varying densities of combustible material.
This flame test evaluates the non-propagation of fire of a bunch of cables.
3 test categories to test the different amounts of combustible material contained in a bundle of cable.
