Technical Information Power And Control Cables Power Appendixes Fire Performance of Cable KCI Reduced Smoke PVC Certifcates صفحه KCI Reduced Smoke PVC Certifcates
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Why reduced smoke PVC ? As PVC material makes considerable smoke comparing halogen free materials that means no international standard has referred to low-smoke test for such a cables and in the other hand some projects has requested for low smoke cables with PVC sheath , so KCI has developed reduced smoke PVC for such applications. As PVC has stronger mechanical properties (tensile strength and also fexibility) comparing with halogen free materials , this kind of reduced smoke PVC has signifcant advantages for both having mechanical and safety issues for sensitive usages such as petrochemical plants , ..... . It is very important to note that IEC 61034 is the main test for low smoke cables , but there are another test that is used just for material testing . Scope of ASTM D 2843 : This fre-test-response test method covers a laboratory procedure for measuring and observing the relative amounts of smoke obscuration produced by the burning or decomposition of plastics. It is intended to be used for measuring the smoke-producing characteristics of plastics under controlled conditions of combustion or decomposition. The measurements are made in terms of the loss of light transmission through a collected volume of smoke produced under controlled, standardized conditions. |
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| As you can see from above curves , smoke density rating of KCI reduced smoke PVC is less that Normal PVC . These materials are tested in “Architectural Testing” laboratory . | |
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The another test method for comparing Normal and reduced Smoke PVC is ASTM E 662 standard . Scope of ASTM D E 662 : This fre-test-response standard covers determination of the specifc optical density of smoke generated by solid materials and assemblies mounted in the vertical position in thicknesses up to and including 1 inch . KCI reduced smoke PVC is tested in Exova warringtonefre laboratory . |
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Improved fame retardancy evaluation by Oxygen Index : What Is Oxygen Index Testing? Measuring the amount of oxygen required to support sustained ignition gives an indication of the fammability of the material. Test Method : This part of BS EN ISO 4589 specifes methods for determining the minimum concentration of oxygen, in a mixture with nitrogen, that will support combustion of small vertical test specimens under specifed test conditions. The test is performed at an ambient temperature of 23oC ± 2oC. What Is Temperature Index Testing? Measuring the temperature required to support sustained ignition gives an indication of the fammability of the material. |
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Reduced Halogen acid gas while burning : Obviously PVC during burning makes considerable amount of Halogen (that is inside the polymer formulation polyvinyl - chloride ). For Halogen free materials the value of halogen gas is less than 0.5 % whereas for Normal PVC is about 23 % ! One of another advantages of KCI reduced smoke PVC is lower amount of released halogen gas that is about half of Normal PVC. This material is tested acc to IEC 60754-1 by Exova Warrringtone fre. |
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Ultimate Improved fame retardancy ; IEC 60332-3-22 Category A : Scope of test : IEC 60332-3-22 specifes a method of test for the assessment of vertical fame spread of vertically mounted bunched wires or cables, electrical or optical, under defned conditions. Flame spread is measured as the extent of damage of the cable sample. This procedure may be utilised to demonstrate the cable’s ability to limit fame spread. Part 3-22 of IEC 60332 covers Category A and relates to cables installed on the test ladder to achieve a nominal total volume of non-metallic material of 11 litres per meter of test sample. The fame application time is 40 min. The method of mounting uses the front of the standard ladder. The category is intended for general use where low volumes of non metallic material are required to be evaluated. The test specimen, consisting of a number of 3.5m lengths of cable, is deemed to have met the requirements of the Standard if, after burning has ceased or fames extinguished, the extent of charred portion does not reach a height exceeding 2500mm above the bottom edge of the burner. Results of test : * The duration of after burn was 3 minutes. * The maximum height of the cable charred, as measured from the bottom of the burner, was 1.19m. |
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Resistance to environmental conditions OIL Resistant / UV Resistant : For some special projects , such as petrochemical plants , refneries , .... that the area is polluted with oil and hydrocarbon and also in hot climate zone that cable installed in sun-light exposure ; The outer sheath of cable should be OIL and UV resistant. KCI has developed several kinds of OIL and UV resistant PVC sheaths and has gotcertifcates from Exova laboratories . |
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