選用(yong)阻燃電纜時注意的問題
作者: 發布時間:2023-12-23
設(she)(she)計(ji)人員應該根據(ju)阻(zu)(zu)燃(ran)(ran)(ran)電(dian)(dian)纜(lan)(lan)的(de)(de)具(ju)體特性對阻(zu)(zu)燃(ran)(ran)(ran)電(dian)(dian)纜(lan)(lan)進行設(she)(she)計(ji)選用及(ji)敷設(she)(she)施工(gong),并(bing)應注意以下幾個問(wen)題: (1)由于含鹵阻(zu)(zu)燃(ran)(ran)(ran)電(dian)(dian)纜(lan)(lan)(包括(kuo)阻(zu)(zu)燃(ran)(ran)(ran)電(dian)(dian)纜(lan)(lan)、低(di)鹵低(di)煙阻(zu)(zu)燃(ran)(ran)(ran)電(dian)(dian)纜(lan)(lan))在燃(ran)(ran)(ran)燒(shao)時(shi)會釋放具(ju)有腐蝕(shi)性的(de)(de)鹵酸氣體,大(da)(da)大(da)(da)阻(zu)(zu)礙消防工(gong)作從(cong)而耽誤(wu)救火(huo)時(shi)間(jian)并(bing)加劇火(huo)勢(shi)蔓延,因(yin)此在人口密度較高的(de)(de)公(gong)眾場所(suo)應盡量設(she)(she)計(ji)選用無鹵低(di)煙阻(zu)(zu)燃(ran)(ran)(ran)電(dian)(dian)纜(lan)(lan)。在人口密度較小的(de)(de)作業(ye)區可以選用任意一種(zhong)阻(zu)(zu)燃(ran)(ran)(ran)電(dian)(dian)纜(lan)(lan)。 (2)阻(zu)(zu)燃(ran)(ran)(ran)電(dian)(dian)纜(lan)(lan)分為A、B、C3類(lei),其中A類(lei)阻(zu)(zu)燃(ran)(ran)(ran)電(dian)(dian)纜(lan)(lan)性能較B、C類(lei)更優(you),價格也最(zui)貴。設(she)(she)計(ji)人員提供(gong)訂貨清冊時(shi)應標(biao)明阻(zu)(zu)燃(ran)(ran)(ran)電(dian)(dian)纜(lan)(lan)的(de)(de)類(lei)別。 (3)從(cong)外觀(guan)上無法(fa)區分阻(zu)(zu)燃(ran)(ran)(ran)電(dian)(dian)纜(lan)(lan)的(de)(de)A、B、C類(lei)別,只(zhi)有靠制造廠(chang)家進行供(gong)貨保證,因(yin)此在設(she)(she)計(ji)選用時(shi)應慎重選擇電(dian)(dian)纜(lan)(lan)制造廠(chang)家。 ...
如何判斷阻燃耐火(huo)電纜(lan)的質(zhi)量
作者(zhe): 發(fa)布時間:2023-12-23
判斷阻(zu)燃(ran)耐火電纜(lan)質量的(de)一般要(yao)求如下: 1、阻(zu)燃(ran)耐火電纜(lan)顏(yan)(yan)色(se)(se)(se)識(shi)別(bie)(bie)。 1)顏(yan)(yan)色(se)(se)(se)要(yao)求:徽標(biao)(biao)顏(yan)(yan)色(se)(se)(se)必須(xu)(xu)符合或接近GB6995.2-86 《電線電纜(lan)識(shi)別(bie)(bie)標(biao)(biao)志(zhi)第2部分:標(biao)(biao)準顏(yan)(yan)色(se)(se)(se)》中(zhong)指定的(de)特定顏(yan)(yan)色(se)(se)(se)。 2)清晰度(du):標(biao)(biao)志(zhi)顏(yan)(yan)色(se)(se)(se)應易(yi)于(yu)識(shi)別(bie)(bie)或易(yi)于(yu)識(shi)別(bie)(bie)。 3)內(nei)摩擦(ca)性:標(biao)(biao)志(zhi)要(yao)有(you)內(nei)摩擦(ca),擦(ca)拭(shi)后的(de)顏(yan)(yan)色(se)(se)(se)基本不變。 2、阻(zu)燃(ran)耐火電纜(lan)數字(zi)識(shi)別(bie)(bie)。 1)顏(yan)(yan)色(se)(se)(se)要(yao)求:載體(ti)必須(xu)(xu)是相同(tong)的(de)顏(yan)(yan)色(se)(se)(se),所(suo)有(you)識(shi)別(bie)(bie)數字(zi)的(de)顏(yan)(yan)色(se)(se)(se)必須(xu)(xu)是相同(tong)的(de)顏(yan)(yan)色(se)(se)(se)。載體(ti)顏(yan)(yan)色(se)(se)(se)和徽標(biao)(biao)顏(yan)(yan)色(se)(se)(se)必須(xu)(xu)有(you)很大差(cha)異,并且必須(xu)(xu)能夠(gou)滿(man)足(zu)或接近GB6995.2-86中(zhong)指定的(de)特定顏(yan)(yan)色(se)(se)(se)。 2)清晰度(du):數字(zi)標(biao)(biao)識(shi)要(yao)清晰,書(shu)寫要(yao)清晰。 3)內(nei)摩擦(ca)性:數字(zi)標(biao)(biao)識(shi)必須(xu)(xu)...
哪些因素會影響電纜(lan)的(de)絕緣電阻?
作者(zhe): 發布(bu)時(shi)間:2023-06-05
電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)生產(chan)中(zhong)經常會(hui)遇到(dao)絕(jue)(jue)緣電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)較(jiao)小的(de)現象,并(bing)且(qie)有很(hen)多(duo)因素會(hui)影(ying)響電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)的(de)絕(jue)(jue)緣電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)。今天小編就帶大(da)家(jia)一(yi)起來(lai)了解下相(xiang)關(guan)因素。1.溫度的(de)影(ying)響“隨(sui)著(zhu)溫度升(sheng)高(gao),絕(jue)(jue)緣電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)率降低(di)。這是由于熱運動(dong)(dong)的(de)增加(jia)(jia)(jia)以及(ji)離(li)子的(de)產(chan)生和遷(qian)移(yi)(yi)的(de)增加(jia)(jia)(jia)。在電(dian)(dian)(dian)(dian)(dian)(dian)壓的(de)作(zuo)用下,由離(li)子運動(dong)(dong)形成的(de)傳導電(dian)(dian)(dian)(dian)(dian)(dian)流增加(jia)(jia)(jia)而絕(jue)(jue)緣電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)降低(di)。2.電(dian)(dian)(dian)(dian)(dian)(dian)場強(qiang)(qiang)(qiang)度的(de)影(ying)響:當(dang)電(dian)(dian)(dian)(dian)(dian)(dian)場強(qiang)(qiang)(qiang)度在相(xiang)對較(jiao)低(di)的(de)范圍內時,離(li)子的(de)遷(qian)移(yi)(yi)率與電(dian)(dian)(dian)(dian)(dian)(dian)場強(qiang)(qiang)(qiang)度的(de)增加(jia)(jia)(jia)成比例關(guan)系地增加(jia)(jia)(jia)。離(li)子電(dian)(dian)(dian)(dian)(dian)(dian)流和電(dian)(dian)(dian)(dian)(dian)(dian)場強(qiang)(qiang)(qiang)度遵循(xun)歐姆定律(lv)。當(dang)電(dian)(dian)(dian)(dian)(dian)(dian)場強(qiang)(qiang)(qiang)度相(xiang)對較(jiao)高(gao)時,隨(sui)著(zhu)電(dian)(dian)(dian)(dian)(dian)(dian)場強(qiang)(qiang)(qiang)度的(de)增加(jia)(jia)(jia),離(li)子的(de)遷(qian)移(yi)(yi)率逐(zhu)漸從線性關(guan)系變為(wei)指(zhi)數關(guan)系。當(dang)電(dian)(dian)(dian)(dian)(dian)(dian)場強(qiang)(qiang)(qiang)度接近擊穿時,將(jiang)發生大(da)量的(de)電(dian)(dian)(dian)(dian)(dian)(dian)子遷(qian)移(yi)(yi),并(bing)且(qie)絕(jue)(jue)緣電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)率將(jiang)大(da)大(da)降低(di)。3.濕(shi)度的(de)影(ying)響:由于水的(de)電(dian)(dian)(dian)(dian)(dian)(dian)導率大(da),因此水分子的(de)尺寸...