Slope is not straight and base is uneven: strengthen inspection, repair cable trench, and then accept seriously.

电缆沟边坡不直不平、基底不平：应加强检查，随挖随修，并要认真验收。

For laying in doors , in tunnels and in cable trench , able to bare external mechanical forces and certain puling force.

室内、隧道、电缆沟、竖井等能承受机械外力和一定拉力的场所。

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。