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电缆沟电缆敷设要求是什么谁能说说？

电缆沟电缆敷设要求是什么谁能说说？

浏览：24次 | 提问时间： 07-07 04:04

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别怕我在 07-07 04:05

1、电缆在敷设以前，根据设计要求检查电缆的型号、绝缘情况和外观是否正确、完好。对于采用直埋和水下敷设方式时，则应在直流耐压试验合格后方可敷设。
2、三相系统中使用的单芯电缆，应组成紧贴的正三角形排列，以减少损耗。每隔1～1.5m应用绑带扎紧，避免松散。
3、在三相四线制系统中，不允许采用三芯电缆另外加一根单芯电缆或电线、甚至直接利用三芯电缆的金属护套等作中性线的方式。否则，当三相电流不平衡时，相当于单芯电缆的运行状况，容易引起工频干扰。对铠装电缆来说，则使铠装发热，甚至导致绝缘的热击穿。
4、并列运行的电力电缆，其型号和长度应相同，以免因导电线芯的直流电阻不同，造成载流量分配不均。
5、在运输、安装或运行中，应严格防止电缆扭伤和过度弯曲，电缆的最小允许弯曲半径应满足相关技术要求。
6、在有比较严重的化学或电化学腐蚀区域里，直埋的电缆除应采用具有黄麻外被层的铠装电缆或塑料电缆外，还应加以防腐措施。
7、油浸纸绝缘电力电缆线路的高度差，不应超过20m。否则应选用不滴流电缆或塑料电缆。
8、敷设电缆时，应留出足够的备用长度(一般为1%〜1.5%),以备补偿因温度因素所引起的变形。在易于发生位移的地(如沼泽地等)，直埋备用段应不少于1.5%～2%。保护管的出(入)口处也应留有3～5m的备用段，以备检修时使用。
9、在敷设电缆前的24h内，如果电缆的存放处及敷设现场的平均温度低于允许数值时，不宜施工。如因特殊情况必须施工时，应将电缆预先加热，使电缆在开始施工至敷设完毕，电缆线芯和外皮温度均保持在5℃以上，否则需二次加热。

且由他 07-07 04:13

具体要求如下：
1.电缆沟内全长应装设有连续的接地线装置，接地线的规格应符合规范要求。
2.敷设在不填黄沙的电缆沟内的电缆，为防火需要，应采用裸铠装或非易燃性外护层的电缆。
3.电缆线路上如有接头，为防止接头故障时殃及邻近电缆，可将接头用防火保护盒保护或采取其它防火措施。
4.电缆沟的沟底可直接放置电缆，同时沟内也可装置支架，以增加敷设电缆的数量。
5.电缆固定于支架上，水平装置时，外径不大于50mm的电力电缆及控制电缆，每隔0.6m一个支撑；外径大于50mm的电力电缆，每隔1.0m一个支撑。排成正三角形的单芯电缆，应每隔1.0m用绑带扎牢。垂直装置时，每隔1.0—1.5m应加以固定。
6.电缆沟内的金属结构物均需采取镀锌或涂防锈漆的防腐措施。
7.电力电缆和控制电缆应分别安装在沟的两边支架上。若不具备条件时，则应将电力电缆安置在控制电缆之上的支架上。

Prosperous悲 07-07 04:21

电缆埋置深度应符合下列要求：
一、电缆表面距地面的距离不应小于0.7m。穿越农田时不应小于1m。在引入建筑物、与地下建筑物交叉及绕过地下建筑物处，可浅埋，但应采取保护措施。
二、电缆应埋设于冻土层以下，当受条件限制时，应采取防止电缆受到损坏的措施。一般的在施工中，直埋电缆大家都采用铠装电缆，为了确保安全。管沟敷设：电缆与热管道(沟)、油管道(沟)、可燃气体及易燃液体管道(沟)、热力设备或其他管道(沟)之间，虽净距能满足要求，但检修管路可能伤及电缆时，在交叉点前后1m范围内，尚应采取保护措施；当交叉净距不能满足要求时，应将电缆穿入管中，其净距可减为0.25m
四、电缆与热管道(沟)及热力设备平行、交叉时，应采取隔热措施，使电缆周围土壤的温升不超过10℃.

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