JDG Tube Related Knowledge

1, process introduction

JDG tube (sleeve galvanized steel conduit, steel flat conduit for electrical installation) is a new type of protective conduit for electrical circuits, connecting conduits and their metal attachments are made of screw connection technology No need to do cross-grounding, welding, and threading. It is the best choice for protection pipelines of Mingdian dark-coated insulated wires.

2, analysis of advantages and disadvantages

JDG tube is a replacement product of various kinds of traditional wire conduits, such as PVC pipe and SC pipe, and it is a breakthrough innovation in the field of construction electrics using new materials and new technologies. The JDG pipe uses a galvanized steel pipe and a thin-walled steel pipe to connect the grounding cable, which overcomes the disadvantages of the complex construction and large construction loss of the common metal conduit, and also solves the problems of poor fire resistance and difficult grounding of the PVC pipe. Because the JDG pipe has an increase in cost compared with ordinary pipes, it is mostly used for construction such as integrated wiring and fire-fighting wiring during construction.

3 Technical standards

JDG tube series products are designed and produced according to GB/T14823.1-93 and GB/T13381.1-92 standards according to the national standard "Special requirements for electrical installation conduits".

4 Project acceptance

In accordance with the “CECS 120:2007 Rules for the Construction and Acceptance of Steel Pipeline Pipes with Closed-set Types” established by the China Engineering Construction Standardization Association, project acceptance was carried out.

5 Construction process

(1) The cut off of the JDG pipe shall be cut with a toothless saw or a hacksaw. The port shall be smooth and free of burrs.

(2) When the JDG pipe is darkly laid, its bending radius should not be less than 6 times the outside diameter of the pipe. In the concrete plane, its bending radius should not be less than 10 times the outside diameter of the pipe. When the JDG pipe is laid, its bending radius is not Should be less than 6 times the outside diameter of the tube. When there is only one bend between two junction boxes, the bend radius should not be less than 4 times the outer diameter of the tube.

(3) When the JDG pipe is concealed, the spacing between the fixed points shall not be greater than 1000mm, and the distance between the fixed point and the elbow, junction box and terminal shall be greater than 150mm and less than 300mm.

(4) When the JDG tube is buried in the wall or concrete, the net distance between the pipeline and the wall or concrete surface should not be less than 15mm.

(5) When laying tightly-fitting steel conduit pipes, the specifications of their brackets and hangers shall be less than the round steel: 6mm in diameter; flat steel: 30mm*3mm:; angle steel: 25mm* when there is no design requirement. 25mm*3mm rule.

(6) Pipes (boxes) shall be one hole and one hole. The pipe diameter shall be consistent with the knockout hole of the box (box). It is forbidden to open the long hole. The arrangement of the tube into the box (box) should be neat and evenly spaced, with the box (box) flush with the wall.

(7) After the piping is completed, in order to prevent foreign matter from entering the pipe, plugging should be done at the end.

(8) When pouring the concrete, an electrician should be kept in charge to prevent the pipe and junction box from shaking and shifting.

(9) After the template is removed, the pre-sweep should be performed in time. The swab should be fixed at one end of the strip line and pulled out from the other end of the pipeline to remove debris that enters the pipe due to the galvanizing line or Water. After the sweep is completed, the box is closed.

6 Specifications

JDG tube according to the pipe diameter, specifications are 16mm 20mm 25mm 32mm 40mm 50mm

According to wall thickness, specifications are 1.0mm 1.1mm 1.2mm 1.3mm 1.4mm 1.5mm 1.6mm

7 related accessories

Iron direct, iron box, iron star anise, iron clip