If the telephone hub is not a number of telephone summary in a telephone trunk? Wiring frame, how should the connection? More
Calculation method: the amount of engineering calculation formula: L = (pipe length calculation + wire reserved length) × with the number of cross-section wire. Note: plastic pipe should not be flattened, cracks, no debris in the tube, cut the mouth should be flat, the nozzle should be shaved plastic wire pipe connection using glue bonding, plastic pipe bonding must be tightly tight, and in the pipeline plug on the plastic pipe plug, to prevent the paddle, plug tube concrete floor, wall and brick structure of the various switches, socket bottom box , The lamp junction box and the pipe connection must be connected with the wiring, is strictly prohibited plastic pipe directly into the junction box dark in the concrete junction box requirements with wet cement paper or plastic foam filled with internal, not allowed to use The cement paper packs its outside. Embedded in the floor, the shear wall of the plastic pipe, the junction box should be fixed firmly to prevent the shift to adopt
Item Underground metal pipe Underground take vinyl pipe Polyethylene pipe Above the facility Take vinyl pipe The facility below the water supply pipe, other gas pipe 0.150.150.15 Drain pipe 0.150.150.20 Cascade cable Buried 0.500.500.5 Within the pipe 0.150.200.20 Heating pipe t ≤ 150 ℃ Buried heating pipe 0.150.50 plus casing 1.30 plus casing t≤150 ℃ heating pipe groove 0.150.20 plus tube or 0.40.3 plus casing t ≤ 280 ℃ steam heating Pipe ditch 0.151.00 plus casing does not allow the railway rail bottom 1.201.20 plus casing
PVC pipe: the commonly used PVC threading pipe wall thickness of the A-thick type, B-type general-purpose, C (PVC) Type thin-walled three. General engineering is the most used B-tube. B-type tube DN20 wall thickness of 1.. DN25 wall thickness of 1.. DN32 wall thickness of 2.0JDG hot galvanized wire tube: JDG in addition to 16 pipe wall thickness of 1.. the rest of all 1.6U-PVC drain : 50 * 2.0; 75 * 2.3; 110 * 2.8; 110 * 3.2; 160 * 3.2; 160 * 4.0
