IEC 60331-11:1999标准规定了电缆在火灾条件下的测试方法，以评估电缆的电路完整性。测试的目的是确定电缆在火灾条件下的性能，以确保电缆在火灾发生时能够保持电路完整性，从而保护人员和财产的安全。

该标准要求在火焰温度至少为750°C的条件下进行测试。测试时，电缆应在垂直方向上悬挂，并暴露在火焰中。测试时间为180分钟。测试期间，应记录电缆的电路完整性情况，并在测试结束后进行评估。

评估电缆的电路完整性时，应检查电缆是否出现短路、断路或其他故障。如果电缆的电路完整性没有受到影响，则电缆符合该标准的要求。

该标准适用于所有类型的电缆，包括电力电缆、通信电缆和控制电缆等。测试的目的是确定电缆在火灾条件下的性能，以确保电缆在火灾发生时能够保持电路完整性，从而保护人员和财产的安全。

除了测试方法外，该标准还规定了测试设备的要求。测试设备应能够提供稳定的火焰温度，并能够记录测试期间的温度变化。测试设备还应具有足够的安全措施，以确保测试过程中的安全。

总之，IEC 60331-11:1999标准是评估电缆在火灾条件下的电路完整性的重要标准。该标准的实施可以确保电缆在火灾发生时能够保持电路完整性，从而保护人员和财产的安全。

相关标准
- IEC 60331-1:1999 Tests for electric cables under fire conditions - Circuit integrity - Part 1: Test method for fire with shock at a temperature of at least 830°C for cables of rated voltage up to and including 0.6/1 kV and with an overall diameter exceeding 20 mm
- IEC 60331-2:1999 Tests for electric cables under fire conditions - Circuit integrity - Part 2: Test method for fire with shock at a temperature of at least 830°C for cables of rated voltage up to and including 0.6/1 kV and with an overall diameter of less than or equal to 20 mm
- IEC 60331-21:1999 Tests for electric cables under fire conditions - Circuit integrity - Part 21: Procedures and requirements - Cables of rated voltage up to and including 0.6/1 kV
- IEC 60331-23:1999 Tests for electric cables under fire conditions - Circuit integrity - Part 23: Procedures and requirements - Cables of rated voltage up to and including 0.6/1 kV with copper or aluminium conductors and their accessories
- IEC 60331-25:1999 Tests for electric cables under fire conditions - Circuit integrity - Part 25: Procedures and requirements - Cables of rated voltage up to and including 0.6/1 kV with special fire performance and cables with rated voltage up to and including 1.0/1.0 kV