For laying indoors, in tunnel or cable trench, unable to bear external mechanical forces, Singlecore cable in magnetic duct is not permissible.
室内、隧道、电缆沟等场所，不能承受机械外力，单芯电缆不允许敷设在磁性管道中。
2
For laying indoors, in tunnels or cable trench, unable to bear external mechanical forces. Singlecore cable in magnetic duct is not permissible.
室内、隧道及电缆沟等场所，不能承受机械外力。单芯电缆不允许敷设在磁性管道中。
3
The efficiency of coupling between DH lasers and tapered launchers with singlecore, clad-core and double core has been calculated by using skew ray tracing technique.