家庭布電線:電線超負荷原因及注意事項
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來源:金環宇電線發(fa)布日(ri)期:2020-04-07 10:19
超(chao)負荷(he)也叫“過(guo)(guo)載(zai)(zai)”。例如某(mou)型汽(qi)車(che)的載(zai)(zai)重量為4噸,超(chao)過(guo)(guo)這(zhe)個規(gui)定的載(zai)(zai)重量就(jiu)是“過(guo)(guo)載(zai)(zai)”,這(zhe)樣容易損壞(huai)車(che)輛。電(dian)(dian)(dian)(dian)線也有(you)它(ta)的載(zai)(zai)電(dian)(dian)(dian)(dian)規(gui)定。電(dian)(dian)(dian)(dian)流通(tong)過(guo)(guo)電(dian)(dian)(dian)(dian)線會(hui)使電(dian)(dian)(dian)(dian)線發熱,這(zhe)本來是正常現象。但如果超(chao)負荷(he)使用,細電(dian)(dian)(dian)(dian)線通(tong)過(guo)(guo)大電(dian)(dian)(dian)(dian)流,就(jiu)容易引起火(huo)災。
室內安(an)裝明線(xian),環境溫度不應高(gao)于35c。在電(dian)線(xian)安(an)全載流內選用(yong)電(dian)線(xian),電(dian)線(xian)不會發生(sheng)過熱(re)(re)(re)。但用(yong)電(dian)量(liang)超過電(dian)線(xian)的(de)安(an)全載流時(shi),電(dian)線(xian)會發熱(re)(re)(re),電(dian)線(xian)的(de)發熱(re)(re)(re)量(liang)和電(dian)流強度的(de)平(ping)方成正比(bi)(bi),如果電(dian)流強度增加2倍(bei),發熱(re)(re)(re)量(liang)就比(bi)(bi)原來增加4倍(bei),會造成電(dian)線(xian)過熱(re)(re)(re),容易引(yin)起(qi)火災。
超負荷原因
新線(xian)選(xuan)(xuan)(xuan)線(xian)太細(xi)(xi),截(jie)面小;在舊(jiu)線(xian)上任意增加負荷(he)(he);保險絲選(xuan)(xuan)(xuan)用(yong)不當。保險絲選(xuan)(xuan)(xuan)細(xi)(xi)了(le),經常斷(duan)電(dian),不利于供電(dian);保險絲選(xuan)(xuan)(xuan)粗了(le),超(chao)負荷(he)(he)時保險絲不斷(duan),造成過熱燒壞電(dian)線(xian)絕緣層,也容易引起火災。
注意事項
電(dian)(dian)線(xian)(xian)使(shi)用期限的(de)長短,取決于(yu)電(dian)(dian)線(xian)(xian)的(de)質量(liang)和電(dian)(dian)線(xian)(xian)安裝的(de)環境(jing)。電(dian)(dian)線(xian)(xian)主要(yao)靠外面一層包皮(pi)絕緣,時(shi)間一長,受到腐蝕性氣體的(de)腐蝕,絕緣性能逐漸降低(di),慢慢老(lao)化(hua)變硬,發脆或脫落。電(dian)(dian)線(xian)(xian)失去絕緣的(de)性能是很危險的(de),如果兩根(gen)電(dian)(dian)線(xian)(xian)碰在一起或火(huo)線(xian)(xian)碰到與大地相接的(de)東西,就會發生(sheng)跑電(dian)(dian)現象,使(shi)局(ju)部電(dian)(dian)線(xian)(xian)的(de)溫度升高,產生(sheng)火(huo)花,造成(cheng)火(huo)災(zai)。
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