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阻燃电线电缆是指在规定的试验条件下被燃烧，具有火焰蔓延仅在限定范围内。撤去火源后，残烟和残灼能在限定的时间内自行熄灭特性的电缆。
(1)、阻燃电线电缆的阻燃等级
成品电线电缆燃烧分为单根燃烧试验和成束燃烧试验。
A、单跟燃烧试验方法：取自规定长度的试样垂直支持，在试样上部放置涂胶牛皮纸火焰指示器，在试样下方放置手术棉球，用喷灯向试样供火15S，停15S。反复5个周期后，如果火焰指示器烧去25%以上，燃烧的滴落物点燃棉球，火焰的持续时间超过60S则判定为不合格，反之为合格。
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