暗敷设在240mm、370mm 厚墙内的 PVC电线保护管进入接线盒、开关盒、插座盒的作法一般按照图集大样,将进盒的一端管子先弯制成乙字弯,然后,按管路的走向从盒的上、下、左、右的敲落孔与盒连接,见图1。从图1中可以看出,管子进盒端弯制成乙字弯是为了使管路除了进盒的一段外,其余部分置于砖墙中间,以便于砌砖操作和保持墙体 Concealed in 240mm, 370mm thick PVC wire into the protective tube into the junction box, switch box, outlet box approach generally follow the Atlas large sample, into the box at one end of the tube bent into the first bend, then, according to the pipeline To the box from the top, bottom, left and right knockout hole connected with the box, shown in Figure 1. Can be seen from Figure 1, the tube into the box into a curved bend B is to make the pipeline in addition to a section of the box, the rest placed in the middle of the brick wall, in order to facilitate the operation of brick masonry and to maintain the wall