639弱电布线工程(1)金属管的要求金属管应符合设计文件的规定,表面不

639 Weak Current Wiring Engineering <br>(1) Requirements for <br>metal pipes Metal pipes should meet the requirements of the design documents. The surface should not have perforations, cracks and obvious unevenness. The inner wall should be smooth and no corrosion is allowed. In places susceptible to mechanical damage and direct burial in places subject to large forces, pipes with sufficient strength should be used. <br>(2) When cutting and connecting metal pipes, cut the <br>pipes according to the actual length required. The pipe can be cut with a hacksaw, pipe cutter or electric pipe cutter. It is strictly forbidden to cut <br>the connection between the pipe and the pipe, the pipe and the junction box, and the wiring box. File the burrs on the end surface and the inner wall of the pipe mouth to keep the pipe mouth. Smooth, using direct, lock nut and other accessories to connect.

639 Weak electrical wiring engineering<br>(1) The requirements of the metal pipe<br>Metal pipes should comply with the provisions of the design documents, the surface should not have perforations, cracks and obvious bumps uneven, the inner wall should be smooth, not allowed to rust. In places that are susceptible to mechanical damage and when buried directly in places with greater force, a sufficient strength of the pipe should be used.<br>(2) Cutting and connecting of metal pipes<br>When the tube is piped, the pipe is cut according to the actual length required. Pipe cutting can use a saw, pipe cutting knife or electric cutting machine, is strictly prohibited with gas cutting<br>Pipes and pipes, tubes and terminal boxes, wiring boxes, the end of the pipe and the inner wall of the burr light, so that the tube port to maintain smooth, the use of direct, locking mother and other accessories to connect.

639 weak current wiring project<br>(1) Requirements for metal pipes<br>The metal pipe shall comply with the provisions of the design documents, the surface shall be free from perforation, crack and obvious unevenness, and the inner wall shall be smooth without rust. In places prone to mechanical damage and directly buried in places with large stress, pipes with sufficient strength shall be used.<br>(2) Cutting and connection of metal pipe<br>When piping, the pipe shall be cut according to the actual required length. Steel saw, pipe cutter or electric pipe cutter can be used for pipe cutting, and gas cutting is strictly prohibited<br>The burr on the end face and inner wall of the pipe orifice shall be filed smooth for the connection between the pipe and the pipe, between the pipe and the junction box and the wiring box, so as to keep the pipe orifice smooth. The direct and lock nut shall be used for connection.<br>