如果提供了保护墙或屋顶，它们应用不可燃材料建造。
If protective walls or roofs are provided, they should be constructed of noncombustible materials.
本建议描述用不可燃材料来保护电缆的方法，并提供关于密封材料的分类和特性的资料。
This Recommendation describes the protection of cables by means of incombustible materials and provides information on the classification and characteristics of the sealing materials.
由于氧本身不可燃但支持燃烧，救火行动要求尽可能切断氧源，然后按照燃烧的材料来救火。
Since oxygen is nonflammable but supports combustion, fire-fighting actions require shutting off the source of oxygen, if possible, then fighting the fire according to the material involved.
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