着火条件下电缆的试验 电路完整性 第25部分:程序和要求 光缆

[中文适用范围]： IEC 60331 的这一部分规定了测试程序，并给出了在指定条件下受火时保持电路完整性所需的光纤电缆的性能要求，包括建议的火焰施加时间。它描述了样品制备的方法、连续性检查安排、光学测试程序、燃烧电缆的方法，并给出了评估测试结果的要求。 [外文原描述]： IEC 60331-25:1999 Specifies the test procedure and gives the performance requirement, including a recommended flame application time, for optical fibre cables required to maintain circuit integrity when subjected to fire under specified conditions. Describes the means of sample preparation, continuity checking arrangements, optical testing procedure, the method of burning the cables and gives requirements for evaluating test results. Covers electric data cables which have no rated voltage and are used for extra low voltage circuits.