IEC 60331-25:1999标准是一项关于光纤电缆的电路完整性测试的标准。该标准规定了在火灾条件下测试光纤电缆的程序和要求，以确保电缆在火灾情况下的电路完整性。

该标准要求在火灾条件下测试光纤电缆的电路完整性。测试过程中，光纤电缆应该暴露在火焰下，并且应该在一定的时间内保持电路完整性。测试的结果应该满足标准规定的要求。

该标准还规定了测试的具体程序和要求。测试应该在实验室环境下进行，并且应该按照标准规定的程序进行。测试结果应该记录并报告。

该标准的实施可以确保光纤电缆在火灾情况下的电路完整性，从而保证了电缆的安全性和可靠性。

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 0,6/1,0 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 0,6/1,0 kV and with an overall diameter not exceeding 20 mm
- IEC 60331-11:1999 Tests for electric cables under fire conditions - Circuit integrity - Part 11: Apparatus - Fire with shock
- IEC 60331-21:1999 Tests for electric cables under fire conditions - Circuit integrity - Part 21: Procedures and requirements - Electric data cables
- IEC 60331-23:1999 Tests for electric cables under fire conditions - Circuit integrity - Part 23: Procedures and requirements - Power and control cables