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扁电缆安装时最小弯曲半径
Table2 The minimun bend radius of the cable
项目 Item | 单芯电缆single core cable | 三芯电缆 triple core cable | ||
无铠装 Unarmored | 有铠装 Armored r | 无铠装 Unarmored | 有铠装 Armored r | |
安装时的电缆最小弯曲半径 Minimun bend radius of the cable in course of installation | 20D | 15D | 15D | 12D |
靠近连接盒和终端的电缆的最小弯曲半径 The minimun bend radius of the cable close to the junction box and terminal | 15D | 12D | 12D | 10D |
注:D为电缆外径(mm)。Note:D is outer diameter of the cable |
1、 敷设方式
电缆没有敷设落差限制。There is no limit of head drop during the cable laying.
电缆允许敷设在室内、室外、空气中和土壤中,允许局部有积水。
The cable may be laid in indoor, outdoor, air and soil. The cable may be immersed in water locally.
电缆敷设方式可以是隧道、管道、电缆沟、桥架、排管,铠装电缆允许直埋地下,钢丝铠装电缆允许垂直敷设。
The cable may be laid in tunnel, pipe, trench, conduit and on cable bridge. The amoured cable can be laid undergroud, and the wire- amoured cable can be laid vertically.
单芯电缆不允许敷设在磁性金属管内。
The single core cable mustn't be laid in the magnetic metal pipes.
电缆敷设环境应有良好的散热条件。
The enviroment of cable laying shall be in good heat dissipation condition.
2、 电缆敷设时导体最大允许牵引力和电缆最大允许侧压力
The maxium allowed haul-off force and lateral pressure of cable
导体最大允许牵引力计算方法:he calculating method of the maxium allowed haul-off force :
——铜导体:F=70×S(N/mm2)。
——铝导体:F=40×S(N/mm2)。
侧压力计算方法:the calculating method of the maxium allowed lateral pressure:
P=F÷R(N/m),最大允许侧压力不超过3000N/m。the maxium allowed lateral pressure≤3000N/m
式中:F-牵引力,N;lateral pressure
S-导体截面,mm2;conductor section
P-侧压力,N/m;lateral pressure
R-电缆弯曲半径,m。Bend radius