Scope GB/T 2951 specifies the test methods for polymer insulation and sheath materials of power distribution and communication cables and optical cables, including ships and offshore cables and optical cables. This part of GB/T 2951 specifies the low-temperature test method, which is applicable to PVC and polyethylene insulation and sheath materials for wires, cables, and optical cables. 1.1 Normative references. The clauses in the following documents are referred to in this part of GB/1 2951 and become the clauses of this part. For dated reference documents, all subsequent amendments (excluding corrected content) or revisions do not apply to this section. However, parties to agreements based on this section are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest version applies to this section. GB/T 2951.11-2008 General Test Methods for Insulation and Sheath Materials of Electric and Optical Cables - Part 11: General Test Methods - Measurement of Thickness and Boundary Dimensions - Mechanical Performance Test (IEC 60811-1:1993, IDT) - Test Principles - This part does not specify all test conditions (such as temperature, duration, etc.) and all test requirements, They should be specified in the relevant cable product standards. Any test requirements specified in this section can be modified in the relevant cable product standards to meet the needs of special types of cables. The test conditions and parameters specified in this section are applicable to the most commonly used types of insulation and sheath materials for cables, optical cables, wires, and flexible cords. The test methods described in this section are first used as type tests. There are fundamental differences in the conditions between type tests and frequently conducted tests (such as routine tests) for certain test items, and these differences have been identified in this section. All tests for pre-treatment should be stored for at least 16 hours after extrusion or vulcanization (or cross-linking) of insulation and sheath materials. 6. The temperature test should be conducted at the temperature specified in the relevant cable product standards. The intermediate value of 7 will be arranged in ascending or descending order to obtain the expected number of test data. If the number of valid data is odd, the intermediate value is the positive intermediate value; If it is an even number, the median is the average of the two values in the middle
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