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IEC 60332-3-24: Test on electric cables under fire conditions-Part 3-24: Test for vertical flame spread of vertically-mounted bunched wires or cables-Category C.
IEC 60332-3-24: 着火条件下电缆的通用试验方法—多根成束电缆垂直火焰燃烧测试—第3-24部分-程序--类型C.

IEC 60332-3-25: Test on electric cables under fire conditions-Part 3-24: Test for vertical flame spread of vertically-mounted bunched wires or cables-Category D.
IEC 60332-3-25: 着火条件下电缆的通用试验方法—多根成束电缆垂直火焰燃烧测试—第3-25部分-程序--类型D。