着火条件下电缆和光缆的试验.第1-2部分:单根绝缘电线或电缆垂直火焰蔓延的试验.1kW预混合火焰规程

[中文适用范围]： GB／T 18380的本部分规定了在火焰条件下，单根电线电缆或光缆火焰垂直蔓延试验的方法。试 验装置在GB／T 18380．11 2008中规定。 注1：如果需要．GB／T 18380．12 2008的试验可与GB／T 18380 13--2008的试验同时进行。 推荐的性能要求在附录A中给出。 本部分规定了1 kw预混合型火焰的常规用法．不适用于测试总截面小于0．5 mm。的小规格单根 电线电缆，因为其导体在试验结束之前会被熔化，也不适用于细光缆，因为在试验结束前光缆会断裂a 在这些情况下，试验方法可参照GB／T 18380．22--3008。 注2：使用能延缓火焰蔓延并符合奉标准要求的电线电缆并不足以保证该电线电缆能在所有敷设条件下阻止火焰 的蔓延，因此，在一些蔓延危险性高的场合，如成柬电缆大长度垂直敷设时，还应采用特殊的装置来预防，不 应认为电缆试样符合本标准规定的性能要求t而成束的该种电缆亦会表现出类似的性能(见GB／T 18380．31～ 18380 88系列标准)。 [外文原描述]： IEC 60332-1-2:2004 Specifies the procedure for testing the resistance to vertical flame propagation for a single vertical electrical insulated conductor or cable, or optical fibre cable, under fire conditions. The apparatus is given in IEC 60332-1-1. NOTE 1 Testing to IEC 60332-1-2 may be performed simultaneously with that to IEC 60332-1-3 if required. Recommended requirements for performance are given in Annex A. IEC 60332-1-2 specifies the use of a 1 kW pre-mixed flame and is for general use, except that the procedure specified may not be suitable for the testing of small single insulated conductors or cables of less than 0,5 mm² total cross-section because the conductor melts before the test is completed, or for the testing of small optical fibre cables because the cable is broken before the test is completed. In these cases, the procedure given in IEC 60332-2-2 is recommended. NOTE 2 Since the use of insulated conductor or cable which retards flame propagation and complies with the recommended requirements of this standard is not sufficient by itself to prevent propagation of fire under all conditions of installation, it is recommended that wherever the risk of propagation is high, for example in long vertical runs of bunches of cables, special installation precautions should also be taken. It cannot be assumed that because the sample of cable complies with the performance requirements recommended in this standard, that a bunch of cables will behave in a similar manner. (See IEC 60332-3 series.)