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Special Cables • Temperature Measurement • Cable Harnessing
The above flame resistance and fire propagation tests are often confused with one another on 63022 basis of their very similar designations. However, the test methods employed are quite different.
Test for vertical flame propagation for a single insulated wire or cable This flame resistance test is passed by most cables constructed of flame-retardant materials, e. In the test, a single core or cable with a length of approx.
The test is deemed passed if, after the flame has been removed, the burning cable extinguishes itself and the fire damage is at least 50 mm from the upper mounting clamp.
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It is iecc how long the cable burns before extinguishing itself. Test for vertical flame spread of vertically-mounted bunched wires or cables This fire propagation test is also iev as the “bundle fire test” and is generally only passed by specially developed cables and wires with highly flame-retardant insulation and sheath material.
In most cases, the flame resistance of the plastics used is greatly enhanced by the addition of aluminium or magnesium hydroxide.
Multiple cables are bundled or layered in lengths of approx. The cable volume and time of flame application is defined by the test method, since IEC comprises four different bundle fire tests: IEC Category A is often used for maritime applications on oil rigs and ships, for example.
The test is deemed passed if, after the burner has been switched off, the burning cables extinguish themselves and the fire damage does not cover more than 2. It is impossible to say which of the four test categories poses the most difficult challenge, since there are a range of different factors to consider.
Functional integrity and fire resistance of electric cables Unlike IEC and IECthis test does not assess the flame propagation but instead checks the electrical functioning of the cable in the event of a fire.
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In the iex, a flame is applied across the entire horizontal length of a single, cm cable for a period of 90 minutes. The test is deemed passed, if the cable continues to conduct electricity without shorting throughout the 90 minute flame application and for a subsequent 15 minute cooling period. This test is generally only passed by cables and wires with special, flame-retardant glass or mica wrapping enclosing the individual cores as well as the entire cable bundle.
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BS EN 60322:2001, IEC 60322:2001
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