3 types of fire resistance standards for fire resistant cables

The fire resistance of fire-resistant cables, that is, the line can maintain its integrity for a certain period of time under flame conditions. But different standards on the fire resistance of cables to assess the indicators are different. Kind of fire-resistant standard is IEC60331: IEC60331-21 mainly about the rated voltage of 0.6/1kV and the following cables in the flame conditions to maintain the integrity of the line test procedures and requirements. It stipulates that the flame temperature should not be lower than 750℃ and the fire time is recommended to be 90min. no spraying and vibration should be carried out during the test. The second fire-resistant standard is AS/NZS3013. the third fire-resistant standard is BS6387: horizontal combustion test for the A class 650 ℃ / 3h, B class 750 ℃ / 3h, C class 950 ℃ / 3h, S class 950 ℃ / 20min. A class indicates that at 650 ℃ under the application of the rated voltage of the cable level of combustion for 3 hours without breakdown. B class indicates that at 750 ℃ under the application of the rated voltage of the cable level of combustion for 3 hours without breakdown. Class B indicates that the rated voltage level of the cable is applied at 750℃ for 3 hours without breakdown. class C indicates that the rated voltage level of the cable is applied at 950℃ for 3 hours without breakdown. class S indicates that the rated voltage level of the cable is applied at 950℃ for 20min without breakdown. Water spray test for the W level, said to apply the rated voltage level of the cable burning 15min after the drench burning 15min without breakdown. Shock combustion test is divided into X level 650 ℃ / 15min, Y level 750 ℃ / 15min, Z level 950 ℃ / 15min. at the same time to start the vibration device and combustion device for 15min without breakdown. Therefore, BS6387 requirements for more specific models for CWZ.

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