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電伴(ban)熱帶中部起火原因分析如下：

電伴(ban)熱帶中部起火(huo)原因外護套受損，帶電的線(xian)芯外漏，在雨雪天氣潮濕環境(jing)下線(xian)芯引起短路。

電(dian)(dian)(dian)伴熱(re)(re)帶中部起火(huo)原因保(bao)溫層(ceng)(ceng)未做防水處理，雨雪天(tian)氣保(bao)溫層(ceng)(ceng)侵水，使得伴熱(re)(re)帶部分線路處于(yu)低(di)溫或潮濕狀(zhuang)態(tai)下并(bing)以較大的輸出(chu)功率(lv)工作，電(dian)(dian)(dian)熱(re)(re)帶局部電(dian)(dian)(dian)量超負荷，衰減率(lv)不(bu)均(jun)勻，局部電(dian)(dian)(dian)流(liu)過大造(zao)成內部起火(huo)短路，產生電(dian)(dian)(dian)火(huo)花。

電(dian)(dian)(dian)伴熱(re)(re)帶(dai)(dai)在安(an)裝過程中，未對電(dian)(dian)(dian)熱(re)(re)帶(dai)(dai)做成品(pin)保護，踩踏(ta)，拖拽，拉扯，扭曲電(dian)(dian)(dian)熱(re)(re)帶(dai)(dai)，造成電(dian)(dian)(dian)熱(re)(re)帶(dai)(dai)內部線(xian)芯變(bian)形受損，一(yi)般施工(gong)(gong)場合都比較雜亂，即使是堅韌的氟塑料外套型(xing)電(dian)(dian)(dian)熱(re)(re)帶(dai)(dai)在不(bu)注(zhu)意的情況下(xia)，也(ye)會被輕易割裂。長時間大功率高(gao)溫工(gong)(gong)作的狀態下(xia)受損的線(xian)芯發(fa)熱(re)(re)不(bu)均勻，局(ju)部溫度過高(gao)，引發(fa)起火。