Wire tube threading and threading process

1. Wire and pipe threading process

(1)Before threading, check whether the pipeline is unblocked, whether the direction of the pipeline and the positions of boxes and boxes are in accordance with the requirements of design and construction drawings; with galvanized iron wire or steel wire with a diameter of 1.2-2.0mm, The line should be straight and unbuckled, kinked, etc., and have a corresponding mechanical pull.

(2) Sweep the pipeline. The purpose of cleaning the pipeline is to remove dust, muddy water and other debris from the pipeline.

(3) Wire tube with guard mouth. After the wire tube is cleaned, select the appropriate size of the shroud according to the diameter of the wire tube and put the shroud into the tube mouth. Before threading the conduits, check whether the guards of each nozzle are complete. If any are missing or damaged, they should be repaired and replaced.

2. Electric wire pipe threading process

1) Material requirements for wires

The specification and type of the wire must meet the design requirements, and there should be a factory certificate, a "CCC" certification mark and a copy of the certificate and a production license. When entering the market, the wire should be inspected for its specifications, model, appearance quality and marking on the wire, and use a caliper to check whether the wire diameter meets the national standards. The layout of the wiring and its wire type and specifications should meet the design requirements.

2) Bundling of wires and cords

When the number of the wires is 2-3, the insulation layer at the front end of the wire can be stripped off, and then the wire core can be tied tightly with the strip wire to form a smooth cone transition portion.

3) threading and disconnection

(1) Take the line off. Before laying the line, the specification and type of the wire shall be checked according to the design drawings. The wire shall be put on the payoff frame or on the payline when putting the wire out. The wire cannot be dragged on the ground at random, and no brute force may be used to prevent damage to the insulation. Layer or pull off the core. Threading requires two people at one end, one slowly pulls the wire with the wire, and the other slowly feeds the wire into the tube.

(2) disconnection. When cutting the wire, the reserved length of the wire is considered as follows: The reserved length of the wires in the bottom box, the switch box, the socket box and the lamp box is more than 150mm and less than 250mm; the reserved length of the wires in the distribution box is 1⁄2 of the circumference of the box of the electric box; at the branch, the trunk can be used as a branch joint without cutting the wire, and the stay should be based on the actual length.

(3) threading requirements. The wires in the wire conduit should pass through once, and the wires passing through the wire conduit should be color-separated. To ensure the safety and convenience of construction, a section of the trunk circuit and each power branch circuit at the outlet of the wire tube to the distribution box and switchboard Color separation should be determined according to the color code.

Every line that enters the box and the switch box needs to be insulated with an insulating tape. The coil is coiled with 16mm wire and rolled neatly into the box. In order to avoid all kinds of electrical accidents caused by poor quality of the wire connector, when the wires are laid, it should be avoided to have joints in the wire tube. The joints should be in the bottom box (box). In order to prevent accidents such as fire and electric shock, the insulated wires led from the bottom case to the apparatus in the ceiling should be protected by flexible metal wire protection tubes or metal hoses, and the wires should not be exposed.