电缆是现代电力系统中不可或缺的组成部分。在火灾条件下，电缆的性能至关重要，因为它们必须能够保持电路完整性，以确保电力系统的安全和可靠性。IEC 60331-2:2018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。

本标准适用于额定电压为0.6/1.0 kV及以下，整体直径不超过20mm的电缆。测试方法是在至少830°C的温度下进行冲击火灾测试，以评估电缆在火灾条件下的性能。测试过程中，电缆必须保持通电状态，并且测试时间为180分钟。测试结束后，评估电缆的电路完整性，以确定其是否符合标准要求。

IEC 60331-2:2018标准的测试方法可以帮助电力系统设计人员选择适合其应用的电缆，并确保电缆在火灾条件下的性能符合标准要求。此外，该标准还可以帮助电力系统维护人员评估现有电缆的性能，并确定是否需要更换或升级电缆。

相关标准
- IEC 60331-1:2018 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 60332-1-2:2018 Tests on electric and optical fibre cables under fire conditions - Part 1-2: Test for vertical flame propagation for a single insulated wire or cable - Procedure for 1 kW pre-mixed flame
- IEC 60332-3-24:2018 Tests on electric and optical fibre cables under fire conditions - Part 3-24: Test for vertical flame spread of vertically-mounted bunched wires or cables - Category C
- IEC 60332-3-25:2018 Tests on electric and optical fibre cables under fire conditions - Part 3-25: Test for vertical flame spread of vertically-mounted bunched wires or cables - Category D
- IEC 60332-3-26:2018 Tests on electric and optical fibre cables under fire conditions - Part 3-26: Test for vertical flame spread of vertically-mounted bunched wires or cables - Category Eca