電力電纜廠家,電力電纜規格
電(dian)(dian)(dian)(dian)力(li)(li)電(dian)(dian)(dian)(dian)纜廠家,電(dian)(dian)(dian)(dian)力(li)(li)電(dian)(dian)(dian)(dian)纜規格(ge),型號,價格(ge),銅芯,批(pi)發,供應名(ming)稱及適用(yong)范(fan)圍銅芯 鋁(lv)芯vv zr-vv vlv zr-vlv 聚氯乙(yi)烯(xi)(xi)絕(jue)緣(yuan)(yuan)聚氯乙(yi)烯(xi)(xi)護(hu)(hu)套(tao)(tao)電(dian)(dian)(dian)(dian)力(li)(li)電(dian)(dian)(dian)(dian)纜 聚氯乙(yi)烯(xi)(xi)絕(jue)緣(yuan)(yuan)聚氯乙(yi)烯(xi)(xi)護(hu)(hu)套(tao)(tao)阻燃(ran)電(dian)(dian)(dian)(dian)力(li)(li)電(dian)(dian)(dian)(dian)纜 敷(fu)設在室內(nei)、隧道(dao)內(nei)、管道(dao)中、電(dian)(dian)(dian)(dian)纜不能(neng)受(shou)機械外力(li)(li)作用(yong)vv22 zr-vv22 vlv22 zr-vlv22 聚氯乙(yi)烯(xi)(xi)絕(jue)緣(yuan)(yuan)鋼帶鎧(kai)裝(zhuang)聚氯乙(yi)烯(xi)(xi)護(hu)(hu)套(tao)(tao)電(dian)(dian)(dian)(dian)力(li)(li)電(dian)(dian)(dian)(dian)纜
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電力電纜廠家,電力電纜規格,型號,價格,銅芯,批發,供應型號 型號 名稱及適用范圍銅芯 鋁芯vv zr-vv vlv zr-vlv 聚氯乙烯絕緣聚氯乙烯護套電力電纜 聚氯乙烯絕緣聚氯乙烯護套阻燃電力電纜 敷設在室內、隧道內、管道中、電纜不能受機械外力作用vv22 zr-vv22 vlv22 zr-vlv22 聚氯乙烯絕緣鋼帶鎧裝聚氯乙烯護套電力電纜 聚氯乙烯絕緣鋼帶鎧裝聚氯乙烯護套阻燃電力電纜 敷設在室內、隧道內、管道中、敷設在地下,電纜能受機械外力作用yjv zr-yjv yjlv zr-yjlv 交聯聚乙烯絕緣、聚氯乙烯護套電力電纜 交聯聚乙烯絕緣、聚氯乙烯護套阻燃電力電纜 敷設在室內、隧道內、管道中、電纜不能受機械外力作用yjv22 zr-yjv22 yjlv22 zr-yjlv22 交聯聚乙烯絕緣鋼帶鎧裝聚氯乙烯護套電力電纜 交聯聚乙烯絕緣鋼帶鎧裝聚氯乙烯護套阻燃電力電纜 敷設在室內、隧道內、管道中、敷設在地下,電纜能受機械外力作用基本結構 電力電纜的基本結構由線芯(導體)、絕緣層、屏蔽層和保護層四部分組成。 銷售;/5962999(1)線芯 線芯是電力電纜的導電部分,用來輸送電能,是電力電纜的主要部分。 (2)絕緣層 絕緣層是將線芯與大地以及不同相的線芯間在電氣上彼此隔離,保證電能輸送,是電力電纜結構中*的組成部分。 (3)屏蔽層15KV及以上的電力電纜一般都有導體屏蔽層和絕緣屏蔽層。 (4)保護層 保護層的作用是保護電力電纜免受外界雜質和水分的侵入,以及防止外力直接損壞電力電纜。電力電纜火災事故原因及對策 電力電纜廠家,電力電纜規格,型號,價格,銅芯,批發,供應 1 電力電纜火災事故的特點當電纜發生火災事故時,火勢兇猛,燃燒迅速,煙氣危害大。 電纜在燃燒時產生大量的二氧化碳、一氧化碳、氯化氫等有害氣體。氯化氫氣體會形成稀鹽酸附著在電氣元件上,使電氣設備的絕緣性能下降,甚至引起短路事故,電氣元件遭到稀鹽酸的腐蝕后清除困難。另外,由于電纜四周活動區域狹小,造成撲救困難,修復時間長,損失嚴重。 2 電力電纜火災事故的原因 2.1電纜隧道堆放雜物,電纜或電纜支架上積灰過厚,電纜隧道有可燃氣體、可燃液體泄漏等,經高溫或明火引燃,發生火災或爆炸。 2.2電纜與熱力管道距離過近或電纜長期過負荷,溫度過高使絕緣材料老化,造成絕緣性能下降,擊穿引燃。 2.3電纜的防護層在電纜敷設時遭到損壞或電纜絕緣在運行中受到機械損傷,引起電纜相間與外層間的絕緣擊穿。 2.4油浸電纜敷設時高、低位差較大,發生淌油或電纜頭滲油現象,致使高位電纜端的絕緣油流失或干枯,熱阻增加,絕緣焦化而擊穿起火。 2.5電纜中間接頭壓接不緊,焊接不牢,使運行中的電纜接頭發生氧化;注入電纜中間接頭盒的絕緣物質劑量不符合要求,或灌注時盒內存有氣孔;電纜盒密封不良或受損,裂紋浸入潮氣,使絕緣擊穿,起火爆炸。 2.6電纜頭表面受潮或積污,電纜頭瓷套管破裂及引出線相間距離過小等導致閃絡起火。 電力電纜廠家,電力電纜規格,型號,價格,銅芯,批發,供應 3 對策 3.1首先要從思想上引起高度重視,嚴把設計、選購、安裝、維護、檢修等各個環節,實行全過程治理,提高電纜安全可靠性。 3.2定期清掃電纜或電纜支架上的積灰,保持其清潔。 3.3加強對運行電纜的巡視維護,禁止電纜長期過負荷高溫運行,敷設電纜時按標準要求進行。 3.4油浸電纜要盡可能做到水平敷設,減少電纜的高、低位差。 3.5電纜頭的制作要符合標準要求,避免運行中因接觸不良而引起發熱,在電纜比較集中的隧道內盡可能不做電纜接頭,如必須要做時,接頭處要采取鐵管包封措施,接頭兩側及其臨近區域內應刷防火涂料或增加防火包帶阻燃。在多個電纜頭并排集中的場合應在電纜頭之間加隔板或填充阻燃材料,避免因一個電纜頭的故障而牽連其他正常電纜頭的安全運行。 3.6電纜隧道應保持干燥通風,防止電纜浸水導致腐蝕,應在通風孔處設積水井,并把積水排至地面。 3.7為把電纜火災事故的損失減到小,除對電纜實施防火、防燃措施外,還必須裝設自動報警裝置和配備必要的滅火器材。電力電纜各型號中符號含義電力電纜各型號中符號含義35KV 交聯聚乙烯絕緣低鹵及無鹵阻燃、耐火電力電纜 型號及名稱 1)型號用字母及數字含義:NH——通過GB12666.6類耐火試驗;ZR——通過GB12666.5類成束燃燒試驗;B——低鹵(型號末位);C——無鹵低煙(型號末位);YJ——交聯聚乙烯絕緣;V——低鹵阻燃聚氯乙烯護套或襯層;S——無鹵阻燃熱塑性聚烯烴護套或襯層;22——鋼帶鎧裝低鹵阻燃聚氯乙烯外護套;24——鋼帶鎧裝無鹵阻燃熱塑性聚烯烴外護套。 2)型號組合結構及表示的電纜名稱,見表 型號 名稱 NH/ZR-YJV-B 交聯聚乙烯絕緣低鹵、阻燃、耐火型電力電纜 NH/ZR-YJV22-B 交聯聚乙烯絕緣低鹵、阻燃、耐火型鋼帶鎧裝電力電纜 NH-ZR-YJS-C 交聯聚乙烯絕緣無鹵低煙、阻燃熱塑性聚烯烴襯墊(或護層)耐火型電力電纜 NH-ZR-YJS24-C 交聯聚乙烯絕緣無鹵低煙、阻燃熱塑性聚烯烴襯墊(或護層)耐火型電力電纜 額定電壓450/750V及以下控制電纜 電力電纜廠家,電力電纜規格,型號,價格,銅芯,批發,供應型號及名稱 產品分類 絕緣 護套 屏蔽、鎧裝 特性 代號 含義 代號 含義 代號 含義 代號 含義 代號 含義 K 控制電纜 V 聚氯乙烯 V 聚氯乙烯 P 銅絲編織屏蔽 R 軟導體結構 Y 聚乙烯 P2 銅帶屏蔽 ZR 阻燃電纜 YJ 交聯聚乙烯 Y 聚乙烯 22 鋼帶鎧裝 NH 耐火電纜2KVV22聚氯乙烯絕緣聚氯乙烯護套鋼帶鎧裝控制電纜。KYJVP-ZR交聯聚乙烯絕緣聚氯乙烯護套銅絲編織屏蔽阻燃控制電纜。KYJVP2-NH 交聯聚乙烯絕緣聚氯乙烯護套銅帶屏蔽耐火控制電纜。主要用途及使用特性適用于額定電壓450/750V及以下的控制、監控回路及保護線路等。交聯聚乙烯(XLPE)絕緣控制電纜長期允許工作溫度不超過90℃,聚氯乙烯絕緣、聚乙烯絕緣控制電纜長期允許工作溫度不超過70℃,安裝環境溫度不低于0℃。銅帶屏蔽或鋼帶鎧裝電纜的彎曲半徑應不小于電纜外徑的12倍,其它類型電纜的彎曲半徑不小于電纜外徑的6倍。 電力電纜各型號中符號含義 T: 銅(一般省略,不寫進型號中) L: 鋁 V:聚氯乙烯絕緣或護套 YJ: 交聯聚氯乙烯絕緣 22: 鋼帶鎧裝 32: 細鋼絲鎧裝 42: 粗鋼絲鎧裝注土壤熱阻系數劃分為:潮濕地區(指沿海、湖、河畔地區、雨量多地區,如華東、華南地區等),取60~80;普通土壤(指一般平原地區,如東北、華北等),取120;干燥土壤(指地區、雨量少的山區、丘陵等干燥地帶),取160~200。 第133條電纜經過耐壓后的泄漏電流,應不大于耐壓前的數值。除塑料電纜外,泄漏電流的不平衡系數應不大于2;但6千伏及以下電纜的泄漏值小于10微安時,10千伏電纜的泄漏值小于20微安時,不平衡系數不作;泄漏電流值只作為判斷絕緣情況的參考,決定是否能投入運行的標準。 ;/ 《電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)運行規(gui)(gui)程》自(zi)頒發(fa)以來,對(dui)(dui)(dui)安全經濟生(sheng)產,起(qi)(qi)了積極作用(yong)(yong)。現(xian)根(gen)據電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)工業發(fa)展的(de)(de)(de)(de)(de)需要和(he)實(shi)踐經驗(yan)的(de)(de)(de)(de)(de)總結,對(dui)(dui)(dui)本規(gui)(gui)程重新作了修訂,自(zi)即日(ri)起(qi)(qi)頒發(fa)執(zhi)行。原(yuan)規(gui)(gui)程同時(shi)作廢。各(ge)(ge)單位的(de)(de)(de)(de)(de)現(xian)場規(gui)(gui)程應(ying)(ying)(ying)(ying)符(fu)合(he)本規(gui)(gui)程的(de)(de)(de)(de)(de)。對(dui)(dui)(dui)本規(gui)(gui)程在(zai)(zai)執(zhi)行中的(de)(de)(de)(de)(de)意見,請隨時(shi)收(shou)集告(gao)我部生(sheng)產司。 第(di)(di)26條敷(fu)設(she)在(zai)(zai)房(fang)屋內(nei)(nei)(nei)(nei)、隧(sui)道(dao)(dao)(dao)內(nei)(nei)(nei)(nei)和(he)不(bu)(bu)(bu)(bu)(bu)(bu)填砂土(tu)的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)溝(gou)(gou)內(nei)(nei)(nei)(nei)的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan),應(ying)(ying)(ying)(ying)采(cai)用(yong)(yong)裸鎧裝(zhuang)或(huo)(huo)非易燃性外(wai)護層(ceng)的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)線(xian)如(ru)有(you)(you)(you)接頭,應(ying)(ying)(ying)(ying)在(zai)(zai)接頭的(de)(de)(de)(de)(de)周圍(wei)采(cai)取防(fang)(fang)止火(huo)焰(yan)蔓延的(de)(de)(de)(de)(de)措(cuo)施。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)溝(gou)(gou)與(yu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)隧(sui)道(dao)(dao)(dao)的(de)(de)(de)(de)(de)防(fang)(fang)火(huo)要求還應(ying)(ying)(ying)(ying)符(fu)合(he)《火(huo)力(li)發(fa)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)廠設(she)計技術(shu)規(gui)(gui)程》與(yu)《變(bian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)所(suo)設(she)計技術(shu)規(gui)(gui)程》的(de)(de)(de)(de)(de)有(you)(you)(you)關。 第(di)(di)16條電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)與(yu)城(cheng)市(shi)街道(dao)(dao)(dao)、公或(huo)(huo)鐵交(jiao)叉時(shi),應(ying)(ying)(ying)(ying)敷(fu)設(she)于(yu)(yu)管(guan)中或(huo)(huo)隧(sui)道(dao)(dao)(dao)內(nei)(nei)(nei)(nei)。管(guan)的(de)(de)(de)(de)(de)內(nei)(nei)(nei)(nei)徑不(bu)(bu)(bu)(bu)(bu)(bu)應(ying)(ying)(ying)(ying)小(xiao)(xiao)于(yu)(yu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)外(wai)徑的(de)(de)(de)(de)(de)1.5倍(bei),且不(bu)(bu)(bu)(bu)(bu)(bu)得(de)小(xiao)(xiao)于(yu)(yu)100毫(hao)米(mi)。管(guan)頂距軌(gui)底(di)或(huo)(huo)公面(mian)的(de)(de)(de)(de)(de)深(shen)度(du)不(bu)(bu)(bu)(bu)(bu)(bu)應(ying)(ying)(ying)(ying)小(xiao)(xiao)于(yu)(yu)1米(mi),距排水溝(gou)(gou)底(di)不(bu)(bu)(bu)(bu)(bu)(bu)應(ying)(ying)(ying)(ying)小(xiao)(xiao)于(yu)(yu)0.5米(mi),距城(cheng)市(shi)街道(dao)(dao)(dao)面(mian)的(de)(de)(de)(de)(de)深(shen)度(du)不(bu)(bu)(bu)(bu)(bu)(bu)應(ying)(ying)(ying)(ying)小(xiao)(xiao)于(yu)(yu)0.7米(mi);管(guan)長除(chu)跨(kua)越公或(huo)(huo)軌(gui)道(dao)(dao)(dao)寬度(du)外(wai),一(yi)(yi)(yi)般(ban)(ban)應(ying)(ying)(ying)(ying)在(zai)(zai)二端各(ge)(ge)伸(shen)出2米(mi),在(zai)(zai)城(cheng)市(shi)街道(dao)(dao)(dao),管(guan)長應(ying)(ying)(ying)(ying)伸(shen)出車道(dao)(dao)(dao)面(mian)。當(dang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)和(he)直流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)氣(qi)(qi)化鐵交(jiao)叉時(shi),應(ying)(ying)(ying)(ying)有(you)(you)(you)適當(dang)的(de)(de)(de)(de)(de)防(fang)(fang)蝕措(cuo)施。 第(di)(di)147條清除(chu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)故障部分(fen)(fen)后,必(bi)須(xu)(xu)進行電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)絕(jue)(jue)緣(yuan)(yuan)的(de)(de)(de)(de)(de)潮(chao)氣(qi)(qi)試驗(yan)和(he)絕(jue)(jue)緣(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻試驗(yan)。檢(jian)驗(yan)潮(chao)氣(qi)(qi)用(yong)(yong)油的(de)(de)(de)(de)(de)溫度(du)為(wei)150℃。對(dui)(dui)(dui)于(yu)(yu)油紙絕(jue)(jue)緣(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan),不(bu)(bu)(bu)(bu)(bu)(bu)能(neng)以半導體(ti)紙有(you)(you)(you)無(wu)氣(qi)(qi)泡來判(pan)(pan)斷電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)絕(jue)(jue)緣(yuan)(yuan)的(de)(de)(de)(de)(de)潮(chao)氣(qi)(qi),而應(ying)(ying)(ying)(ying)以絕(jue)(jue)緣(yuan)(yuan)紙有(you)(you)(you)無(wu)水分(fen)(fen)作為(wei)判(pan)(pan)斷潮(chao)氣(qi)(qi)的(de)(de)(de)(de)(de)標(biao)(biao)準(zhun);對(dui)(dui)(dui)于(yu)(yu)橡(xiang)塑電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)則(ze)以導線(xian)內(nei)(nei)(nei)(nei)有(you)(you)(you)無(wu)水滴作為(wei)判(pan)(pan)斷標(biao)(biao)準(zhun)。 第(di)(di)8條單芯電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)的(de)(de)(de)(de)(de)鉛(qian)包(bao)(bao)只在(zai)(zai)一(yi)(yi)(yi)端接地(di)時(shi),在(zai)(zai)鉛(qian)包(bao)(bao)另一(yi)(yi)(yi)端上的(de)(de)(de)(de)(de)正(zheng)常電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)一(yi)(yi)(yi)般(ban)(ban)不(bu)(bu)(bu)(bu)(bu)(bu)應(ying)(ying)(ying)(ying)超過(guo)(guo)65伏,當(dang)鉛(qian)包(bao)(bao)正(zheng)常電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)超過(guo)(guo)65伏時(shi),應(ying)(ying)(ying)(ying)對(dui)(dui)(dui)易于(yu)(yu)與(yu)人身接觸的(de)(de)(de)(de)(de)裸露的(de)(de)(de)(de)(de)鉛(qian)包(bao)(bao)及其(qi)相連(lian)的(de)(de)(de)(de)(de)設(she)備加以適當(dang)的(de)(de)(de)(de)(de)遮蔽,或(huo)(huo)采(cai)用(yong)(yong)將鉛(qian)包(bao)(bao)分(fen)(fen)段絕(jue)(jue)緣(yuan)(yuan)后對(dui)(dui)(dui)三相鉛(qian)包(bao)(bao)加以互聯(lian)的(de)(de)(de)(de)(de)方法(fa)。 第(di)(di)128條停電(dian)(dian)(dian)(dian)(dian)(dian)(dian)超過(guo)(guo)一(yi)(yi)(yi)個(ge)星期但不(bu)(bu)(bu)(bu)(bu)(bu)滿(man)一(yi)(yi)(yi)個(ge)月(yue)的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan),在(zai)(zai)重新投(tou)入運行前(qian),應(ying)(ying)(ying)(ying)用(yong)(yong)搖表測量(liang)絕(jue)(jue)緣(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻。如(ru)有(you)(you)(you)疑問(wen)時(shi),須(xu)(xu)用(yong)(yong)直流(liu)高(gao)壓(ya)(ya)試驗(yan),檢(jian)查(cha)絕(jue)(jue)緣(yuan)(yuan)是否良(liang)好。停電(dian)(dian)(dian)(dian)(dian)(dian)(dian)超過(guo)(guo)一(yi)(yi)(yi)個(ge)月(yue)但不(bu)(bu)(bu)(bu)(bu)(bu)滿(man)一(yi)(yi)(yi)年的(de)(de)(de)(de)(de),必(bi)須(xu)(xu)用(yong)(yong)直流(liu)高(gao)壓(ya)(ya)試驗(yan),其(qi)試驗(yan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)為(wei)第(di)(di)122條所(suo)的(de)(de)(de)(de)(de)一(yi)(yi)(yi)半電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya),時(shi)間為(wei)一(yi)(yi)(yi)分(fen)(fen)鐘。 第(di)(di)121條根(gen)據試驗(yan)結果被(bei)列為(wei)不(bu)(bu)(bu)(bu)(bu)(bu)合(he)格、但經過(guo)(guo)綜合(he)判(pan)(pan)斷允(yun)許在(zai)(zai)條件下(xia)投(tou)入運行的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan),其(qi)試驗(yan)周期應(ying)(ying)(ying)(ying)較(jiao)標(biao)(biao)準(zhun)縮(suo)短。如(ru)果在(zai)(zai)不(bu)(bu)(bu)(bu)(bu)(bu)少于(yu)(yu)6個(ge)月(yue)的(de)(de)(de)(de)(de)時(shi)期內(nei)(nei)(nei)(nei),經過(guo)(guo)三次以上的(de)(de)(de)(de)(de)試驗(yan),其(qi)缺陷(xian)特性沒有(you)(you)(you)變(bian)化,則(ze)可以按周>期試驗(yan)。 第(di)(di)58條直埋(mai)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)線(xian)必(bi)須(xu)(xu)有(you)(you)(you)詳細的(de)(de)(de)(de)(de)敷(fu)設(she)圖(tu)(tu)樣(參考附(fu)圖(tu)(tu)2),比(bi)例(li)尺一(yi)(yi)(yi)般(ban)(ban)為(wei)1:500,地(di)下(xia)管(guan)線(xian)密集地(di)段為(wei)1:100(甚至更(geng)大(da)),管(guan)線(xian)稀(xi)少地(di)段,為(wei)1:1000。平行敷(fu)設(she)的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)線(xian),盡可能(neng)合(he)用(yong)(yong)一(yi)(yi)(yi)張(zhang)圖(tu)(tu)紙,但必(bi)須(xu)(xu)標(biao)(biao)明各(ge)(ge)條線(xian)相對(dui)(dui)(dui),并標(biao)(biao)明地(di)下(xia)管(guan)線(xian)剖面(mian)圖(tu)(tu)。 第(di)(di)20條電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)直埋(mai)敷(fu)設(she)時(shi),電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)溝(gou)(gou)底(di)必(bi)須(xu)(xu)具有(you)(you)(you)良(liang)好的(de)(de)(de)(de)(de)土(tu)層(ceng),不(bu)(bu)(bu)(bu)(bu)(bu)應(ying)(ying)(ying)(ying)有(you)(you)(you)石塊或(huo)(huo)其(qi)它(ta)硬質雜(za)物(wu),否則(ze)應(ying)(ying)(ying)(ying)鋪以100毫(hao)米(mi)厚的(de)(de)(de)(de)(de)軟土(tu)或(huo)(huo)砂層(ceng)。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)敷(fu)設(she)好后,應(ying)(ying)(ying)(ying)鋪以100毫(hao)米(mi)厚的(de)(de)(de)(de)(de)軟土(tu)和(he)砂層(ceng),然后蓋(gai)以混凝(ning)土(tu)板,覆蓋(gai)寬度(du)應(ying)(ying)(ying)(ying)超出電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)直徑兩側各(ge)(ge)50毫(hao)米(mi)。但在(zai)(zai)不(bu)(bu)(bu)(bu)(bu)(bu)得(de)已的(de)(de)(de)(de)(de)情況下(xia),也允(yun)許用(yong)(yong)磚(zhuan)代替混凝(ning)土(tu)板。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)型號←電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)型號那么(me)多怎么(me)選