着火条件下电缆的试验.电路完整性.第3部分:在金属外壳中试验的额定电压0.6/1.0 kV及以下电缆在至少830°C温度下冲击着火的试验方法

[中文适用范围]： 本部分IEC 60331规定了电缆在金属外壳内进行测试并在规定条件下经受火灾和机械冲击时保持电路完整性的测试方法。 本文件适用于额定电压不超过600 V / 1000 V的电缆，包括额定电压低于80 V的电缆、金属数据和电信电缆以及光纤电缆。 它用于测试总直径不超过20 mm的电缆。 本文件包括与额定电压高达并包括600 V / 1000 V的电力电缆和控制电缆相关的具体故障点、连续性检查安排、测试样品、测试程序和测试报告的详细信息。IEC 60331-3未提供与金属数据和电信电缆以及光纤电缆相关的具体故障点、连续性检查安排、测试样品、测试程序和测试报告的详细信息。 尽管范围仅限于额定电压高达并包括0.6 / 1.0 kV的电缆，但在制造商和购买者同意的情况下，该方法可用于额定电压高达并包括1.8 / 3(3.3) kV的电缆，前提是使用合适的保险丝。 不假定通过此方法成功评估的电缆也将满足IEC 60331-1或IEC 60331-2的要求。对这两个标准的测试应单独进行。这种额外的性能可以通过根据IEC 60331-1:2018第11条或IEC 60331-2:2018第11条的标记来识别。 附录A提供了用于测试的燃烧器和控制系统的验证方法。 警告 - 本标准中的测试可能涉及危险电压和温度的使用。应采取适当的预防措施以防止可能涉及的触电、烧伤、火灾和爆炸风险，以及可能产生的有害烟雾。 [外文原描述]： IEC 60331-3:2018 specifies the test method for cables which are required to maintain circuit integrity when tested in a metal enclosure and when subject to fire and mechanical shock under specified conditions. This document is applicable to cables of rated voltage not exceeding 600 V/1 000 V, including those of rated voltage below 80 V, metallic data and telecom cables and optical fibre cables. It is intended for use when testing cables not greater than 20 mm overall diameter. This document includes details for the specific point of failure, continuity checking arrangement, test sample, test procedure and test report relevant to electric power and control cables with rated voltage up to and including 600 V/1 000 V. Details for the specific point of failure, continuity checking arrangement, test sample, test procedure and test report relevant to metallic data and telecom cables and optical fibre cables are not given by IEC 60331-3. Although the scope is restricted to cables with rated voltage up to and including 0,6/1,0 kV, the procedure can be used, with the agreement of the manufacturer and the purchaser, for cables with rated voltage up to and including 1,8/3 (3,3) kV, provided that suitable fuses are used. It is not assumed that cables successfully assessed by this method, will also pass requirements for either IEC 60331-1 or IEC 60331-2. Testing to either of these two standards is to be carried out separately. Such additional performance can be recognised by the marking in accordance with IEC 60331-1:2018 Clause 11 or IEC 60331 2:2018 Clause 11. This second edition cancels and replaces the first edition published in 2009. It constitutes a technical revision. The significant technical changes with respect to the previous edition are as follows: – extension of the scope to include metallic data and telecom cables and optical fibre cables, although details for the specific point of failure, continuity checking arrangement, test sample, test procedure and test report relevant to metallic data and telecom cables and optical fibre cables are not given by IEC 60331-3; – improved description of the test environment; – mandatory use of mass flow meter/controllers as the means of controlling accurately the input flow rates of fuel and air to the burner; – improved description of the information to be included in the test report.