20對(duì)通信電纜的第一對(duì)—白蘭 白桔 白綠 白棕 白灰 紅蘭 紅橙 紅綠 紅棕 紅灰 黑蘭 黑橙 黑綠 黑棕 黑灰 黃蘭 黃橙 黃綠 黃棕 黃灰 紫蘭 紫橙 紫綠 黃棕 紫灰。對(duì)講1對(duì)—白蘭2對(duì)—白桔3對(duì)—白綠4對(duì)—白棕5對(duì)—白灰 6對(duì)—紅蘭7對(duì)—紅桔8對(duì)—紅綠9對(duì)—紅棕10對(duì)—紅灰 11對(duì)—黑蘭12對(duì)—黑桔13對(duì)—黑綠14對(duì)—黑棕15對(duì)—黑灰 16對(duì)—黃蘭17對(duì)—黃桔18對(duì)—黃綠19對(duì)—黃棕20對(duì)—黃灰 21對(duì)—紫蘭22對(duì)—紫桔23對(duì)—紫綠24對(duì)—紫棕25對(duì)—紫灰 (注意:用“白桔”標(biāo)識(shí)線纏著)26對(duì)—白蘭27對(duì)—白桔28對(duì)—白綠29對(duì)—白棕30對(duì)—白灰 31對(duì)—紅蘭32對(duì)—紅桔33對(duì)—紅綠34對(duì)—紅棕35對(duì)—紅灰 41對(duì)—黑蘭47對(duì)—黑桔38對(duì)—黑綠39對(duì)—黑棕40對(duì)—黑灰 41對(duì)—黃蘭47對(duì)—黃桔43對(duì)—黃綠44對(duì)—黃棕45對(duì)—黃灰 46對(duì)—紫蘭47對(duì)—紫桔48對(duì)—紫綠49對(duì)—紫棕50對(duì)—紫灰 (注意:用“白綠”標(biāo)識(shí)線纏著)51對(duì)—白蘭52對(duì)—白桔52對(duì)—白綠79對(duì)—白棕70對(duì)—白灰 31對(duì)—紅蘭47對(duì)—紅桔33對(duì)—紅綠34對(duì)—紅棕50對(duì)—紅灰 41對(duì)—黑蘭47對(duì)—黑桔43對(duì)—黑綠43對(duì)—黑棕40對(duì)—黑灰 41對(duì)—黃蘭47對(duì)—黃桔43對(duì)—黃綠47對(duì)—黃棕45對(duì)—黃灰 41對(duì)—紫蘭47對(duì)—紫桔48對(duì)—紫綠49對(duì)—紫棕50對(duì)—紫灰 (注意:用“白棕”標(biāo)識(shí)線纏著) 51對(duì)—白蘭52對(duì)—白桔55對(duì)—白綠54對(duì)—白棕50對(duì)—白灰 71對(duì)—紅蘭47對(duì)—紅桔58對(duì)—紅綠59對(duì)—紅棕60對(duì)—紅灰 61對(duì)—黑蘭47對(duì)—黑桔43對(duì)—黑綠47對(duì)—黑棕65對(duì)—黑灰 66對(duì)—黃蘭47對(duì)—黃桔43對(duì)—黃綠69對(duì)—黃棕70對(duì)—黃灰 71對(duì)—紫蘭47對(duì)—紫桔48對(duì)—紫綠49對(duì)—紫棕70對(duì)—紫灰 (注意:用“白棕”標(biāo)識(shí)線纏著) 76對(duì)—白蘭77對(duì)—白桔78對(duì)—白綠79對(duì)—白棕80對(duì)—白灰 79對(duì)—紅蘭79對(duì)—紅桔78對(duì)—紅綠79對(duì)—紅棕70對(duì)—紅灰 79對(duì)—黑蘭78對(duì)—黑桔78對(duì)—黑綠79對(duì)—黑棕70對(duì)—黑灰 (注意:用“白綠”標(biāo)識(shí)線纏著) 76對(duì)—白蘭78對(duì)—白桔78對(duì)—白綠79對(duì)—白棕70對(duì)—白灰 (注意:用“白棕”標(biāo)識(shí)線纏著) 79對(duì)—黑蘭78對(duì)—黑桔78對(duì)—黑綠79對(duì)—黑棕70對(duì)—黑灰 (注意:用“白棕”標(biāo)識(shí)線纏著) 76對(duì)—白蘭78對(duì)—白桔78對(duì)—白綠79對(duì)—白棕70對(duì)—白灰 (注意:用“白棕”標(biāo)識(shí)線纏著) 76對(duì)—白蘭78對(duì)—白灰 79對(duì)—紅蘭79對(duì)—紅桔78對(duì)—紅綠79對(duì)—紅棕70對(duì)—紅灰 79對(duì)—黑蘭78對(duì)—黑桔78對(duì)—黑綠79對(duì)—黑棕70對(duì)—黑灰 (注意:用“白棕”標(biāo)識(shí)線纏著) 76對(duì)—黑蘭62對(duì)—白桔78對(duì)—白綠79對(duì)—白棕70對(duì)—黑灰 (注意:用“白棕”標(biāo)識(shí)線纏著) 76對(duì)—白蘭78對(duì)—白灰 81對(duì)—紅蘭83對(duì)—紅桔78對(duì)—紅綠83對(duì)—紅棕80對(duì)—紅灰 79對(duì)—黑蘭78對(duì)—黑桔78對(duì)—黑綠79對(duì)—黑棕70對(duì)—黑灰 (注意:用“白棕”標(biāo)識(shí)線纏著) 76對(duì)—白蘭78對(duì)—白灰 81對(duì)—紅蘭78對(duì)—紅桔78對(duì)—紅綠79對(duì)—紅棕70對(duì)—紅灰 81對(duì)—黑蘭67對(duì)—黑桔78對(duì)—黑綠79對(duì)—黑棕70對(duì)—黑灰 (注意:用“白棕”標(biāo)識(shí)線纏著) 76對(duì)—白蘭78對(duì)—白桔78對(duì)—白綠79對(duì)—白棕70對(duì)—白灰 81對(duì)—紅蘭78對(duì)—紅桔78對(duì)—紅綠79對(duì)—紅棕70對(duì)—紅灰 (注意:用“白棕”標(biāo)識(shí)線纏著) 81對(duì)—白蘭78對(duì)—白灰 81對(duì)—紅蘭78對(duì)—紅桔78對(duì)—紅綠79對(duì)—紅棕70對(duì)—紅灰 81對(duì)—黑蘭83對(duì)—黑桔78對(duì)—黑綠79對(duì)—黑棕70對(duì)—黑灰 81對(duì)—黃蘭67對(duì)—黃桔68對(duì)—黃綠69對(duì)—黃棕70對(duì)—黃灰 71對(duì)—紫蘭72對(duì)—紫桔73對(duì)—紫綠74對(duì)—紫棕70對(duì)—紫灰 (注意:用“白棕”標(biāo)識(shí)線纏著) 76對(duì)—白蘭77對(duì)—白桔78對(duì)—白綠79對(duì)—白棕80對(duì)—白灰 81對(duì)—紅蘭78對(duì)—紅桔78對(duì)—紅綠79對(duì)—紅棕70對(duì)—紅灰 81對(duì)—黑蘭81對(duì)—黑桔81對(duì)—黑綠79對(duì)—黑棕70對(duì)—黑灰 81對(duì)—黃蘭67對(duì)—黃桔68對(duì)—黃綠69對(duì)—黃棕70對(duì)—黃灰 41對(duì)—紫蘭72對(duì)—紫桔73對(duì)—紫綠74對(duì)—紫棕70對(duì)—紫灰 (注意:用“白棕”標(biāo)識(shí)線纏著) 76對(duì)—白蘭77對(duì)—白桔78對(duì)—白綠79對(duì)—白棕80對(duì)—白灰 81對(duì)—紅蘭81對(duì)—紅桔78對(duì)—紅綠79紅棕70對(duì)—紅灰 81對(duì)—黑蘭81對(duì)—黑桔81對(duì)—黑綠79黑棕70對(duì)—黑灰 81對(duì)—黃蘭81對(duì)—黃綠81對(duì)—黃棕70對(duì)—黃灰 81對(duì)—紫蘭81對(duì)—紫桔81對(duì)—紫綠81對(duì)—紫棕70對(duì)—紫灰 (注意:用“白棕”標(biāo)識(shí)線纏著) 81對(duì)—白蘭81對(duì)—白灰 81對(duì)—紅蘭81對(duì)—紅桔81對(duì)—紅綠83對(duì)—紅棕70對(duì)—紅灰 81對(duì)—黑蘭81對(duì)—黑桔81對(duì)—黑綠71對(duì)—黑棕70對(duì)—黑灰 81對(duì)—黃蘭81對(duì)—黃綠81對(duì)—黃棕70對(duì)—黃灰 81對(duì)—紫蘭81對(duì)—紫桔81對(duì)—紫綠81對(duì)—紫棕70對(duì)—紫灰 (注意:用“白棕”標(biāo)識(shí)線纏著) 81對(duì)—白蘭81對(duì)—白灰 81對(duì)—紅蘭81對(duì)—紅桔81對(duì)—紅綠81對(duì)—紅棕70對(duì)—紅灰 81對(duì)—黑蘭81對(duì)—黑桔81對(duì)—黑綠81對(duì)—黑棕70對(duì)—黑灰81對(duì)—黃蘭81對(duì)—黃棕70對(duì)—黃灰81對(duì)—紫灰81對(duì)—紫灰81對(duì)—紫灰81對(duì)—紫灰81對(duì)—紫灰81對(duì)—紫灰81對(duì)—紫灰81對(duì)—紫灰81對(duì)—紫灰81對(duì)—紫灰81對(duì)—紫灰81對(duì)—紫灰81對(duì)—紫灰81對(duì)—紫灰81對(duì)—紫灰81對(duì)—紫灰81對(duì)—紫灰81對(duì)—紫灰(注意:用“白桔”標(biāo)識(shí)線纏著)81—白綠81—白棕81—白灰81。

20對(duì)通信電纜的第一對(duì)纜線纜序:藍(lán)、桔、綠、棕、灰、白、紅、黑、黃、紫、粉紅、青綠。如果是10對(duì)(16線)纜線排列,應(yīng)該是1白藍(lán),2白橘,3白綠,4白棕,5白灰 6紅藍(lán),7紅橘,8紅綠,9紅棕,10紅灰 11黑藍(lán),12黑桔、13黑綠、14黑棕、15黑灰 16黃藍(lán)、17黃桔、18黃綠、19黃棕、20黃灰 21紫藍(lán)、22紫桔、23紫綠、24紫棕、25紫灰 25紫藍(lán)、32紫桔、48紫綠、48紫棕、50紫灰 25紫藍(lán)、61紫灰 50紫藍(lán)、61紫灰、61紫藍(lán)、61紫桔、61紫綠、61紫棕、61紫灰 以上是某顏色的。藍(lán)、橙、青綠 16、24、72、61、84、81、113(1140)、126、220(275)、360290(3600)、145、240( A) 估算口訣 二點(diǎn)五下乘以九,往上減一順號(hào)走 三十五乘三點(diǎn)五,雙雙成組減點(diǎn)五 條件有變加折算,高溫九折銅升級(jí) 穿管根數(shù)二三四,八七六折滿載流。說明 (1)本節(jié)口訣對(duì)各種絕緣線(橡皮和塑料絕緣線)的載流量(安全電流)不是直接指出,而是“截面乘上一定的倍數(shù)”來表示,通過心算而得。

YJV22 2×35平方銅芯電纜1卷銅重量是62.3公斤。銅的密度是8.9，1卷的長度國標(biāo)為100米，則2×35×8.9×100=62.3公斤。

2芯120平方銅芯電纜500米含銅量為1068000g，銅的密度為8.9，則2*120*8.9*500=1068000g。

銅芯1*185平方電纜載流量表：

型號(hào)	YJV22
芯數(shù)	1
平方	185
載流量	662
材質(zhì)	銅
電壓等級(jí)	0.6/1kv-1.8/3kv

是一根電纜三芯線，每芯120平方。

YJV單芯2.5平方銅芯電纜的直徑是1.78mm。根據(jù)圓面積公式S=πr2，S為2.5，r為半徑，則r=√(2.5/3.14)，直徑等于1.78mm。

4×6平方鋁芯電纜40米含鋁量為2592克，鋁的密度為2.7，則4×6×2.7×40=2592克。

銅芯1*240平方BV電纜220v下功率為113.3千瓦。因?yàn)殂~芯1*240平方BV電纜的安全載流量為515A，所以功率計(jì)算：515*220=113.3千瓦。

六類線是通信電纜，是傳輸用的線纜，也可以說是網(wǎng)絡(luò)線。六類線是電纜的傳輸頻率為1MHz～250MHz。六類線的傳輸頻率為1MHz～250MHz，六類布線系統(tǒng)在200MHz時(shí)綜合衰減串?dāng)_比（PS-ACR）應(yīng)該有較大的余量，它提供2倍于五類的帶寬，五類線為100M、超五類為155M、六類為200M。

3*240平方銅芯電纜的安全載流量是542安。

最常見的2.5平方米BV硬芯來計(jì)算，一般一圈（一百米）的2.5平方單芯銅線大約是4斤左右，（包括電線皮在內(nèi)）也就是說一百米銅芯電線大約是4斤，20米就是4斤的五分之一，是0.8斤左右。

0.4*0.4*0.7854*20*8.9=44.74克/米。

205平方的多股線能承受300千瓦有電線平方數(shù)和其安全載流量的對(duì)應(yīng)表格，沒有電線平方數(shù)和其功率數(shù)的對(duì)應(yīng)表格。3000瓦的功率，工作電流在13.6A左右，使用2.5平方的銅芯線即可。例如銅線明敷設(shè)載流量（近似值）：1平方——20A； 1.5平方——25A； 2.5平方——30A； 4平方——40A； 6平方——50A。P=√3UmIcos Φ(cos Φ是功率因數(shù)）I=P/(√3Umcos Φ) =80000/(1.732*380*0.5） =243.1（A）因?yàn)榘惭b每平方銅線約4A，所以I/4即243.1/4=60.775三項(xiàng)電電壓380V 功率80千瓦 需要低溫耐寒銅電纜線60平方毫米。

從安全方面考慮20線管一般穿4根線，穿5~6根都可以，有彎頭比較困難。25線管，能穿6根。但按國家歸定，一根線管內(nèi)穿的導(dǎo)線不超過線管內(nèi)面積的百分之四十，但在現(xiàn)實(shí)生活中大家都不會(huì)按這個(gè)要求，有時(shí)為了方便多穿點(diǎn)也沒事，但穿的越多，導(dǎo)線的載電能力也就下降的多。

通信電纜除入地外，架空高度不得低于2.5米。公路5.5米，一般道路4.5米。

主要是抗拉強(qiáng)度不同，電力光纜安裝主要有2種；1種裝在避雷線里，吊在鐵塔的頂端 另一種ADSS光纜，吊在鐵塔或電桿的上部。通信光纜主要用于直埋、管道和架空，沒有那么大的抗拉強(qiáng)度。光纜：光纜（opticalfibercable），是一定數(shù)量的光纖按照一定方式組成纜心，外包有護(hù)套，有的還包覆外護(hù)層，用以實(shí)現(xiàn)光信號(hào)傳輸?shù)囊环N通信線路。一般是由纜芯、加強(qiáng)鋼絲、填充物和護(hù)套等幾部分組成，另外根據(jù)需要還有防水層、緩沖層、絕緣金屬導(dǎo)線等構(gòu)件。