How to choose the grade of flame retardant cable

1. should consider the importance of the use of occasions, caused by the degree of fire hazards, such as nuclear power plants, subway stations, terminal buildings, ships and boats cabin parts, thermal power plants, such as the heart of the system, the important places or lines selected high flame retardant cables. 2. should take into account the laying capacity, bundles of laying of the degree of intensity of the IEC332-3 in the test of A, B, C test assessment is based on the volume of combustible cable (to calculate the number of test cable roots) and external ignition source combustion time to distinguish. 3. the cable should be used in a variety of ways. (which is used to calculate the number of roots of the test cable) and the external ignition source combustion time to distinguish. As the standard test assessment is carried out in a vertical manner, the degree of harshness is much greater than the actual operation of other laying methods. So according to the actual laying capacity of the cable and the sum, converted to the volume of combustible material, as a reference to determine the category of flame retardant.3. In the same channel laying cable, the flame retardant level to the same appropriate, flame retardant and non-flame retardant should not be mixed deployment.4. Should consider the environment around the laying cable, whether there is a flammable and explosive system, "the beginning of the source of ignition "After the capacity of the cable is determined, depending on the thickness of the outer diameter of the cable should be selected flame retardant category, the general outer diameter of the thin high, thick outer diameter, armored type of low, some manufacturers and users of high-voltage cables proposed class A (such as 110kv high-voltage cross-linked cables) does not seem to be necessary. 6. cable plant to carry out bundling combustion test Examination and acceptance of users, should be taken seriously flame retardant grade. Through the test must be a full range of test cable specifications, structure should be arbitrary choice. Halogen-free flame retardant cable flame retardant category requires a high level of general class B is appropriate.

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