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阻燃電線電纜是指在規(guī)定的試驗條件下被燃燒，具有火焰蔓延僅在限定范圍內。撤去火源后，殘煙和殘灼能在限定的時間內自行熄滅特性的電纜。 
(1)、阻燃電線電纜的阻燃等級 
成品電線電纜燃燒分為單根燃燒試驗和成束燃燒試驗。 
a、單跟燃燒試驗方法：取自規(guī)定長度的試樣垂直支持，在試樣上部放置涂膠牛皮紙火焰指示器，在試樣下方放置手術棉球，用噴燈向試樣供火15s，停15s。反復5個周期后，如果火焰指示器燒去25％以上，燃燒的滴落物點燃棉球，火焰的持續(xù)時間超過60s則判定為不合格，反之為合格。 
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