Of course, there are norms, and they are mandatory national norms. It is forbidden to use 1.5 square conductor.
16.10.2 electrical installation workers should hold relevant certificates.
16. 1.3 The distribution box shall be wired and powered according to the different power of indoor electrical equipment; High-power household appliances should be wired independently and installed with sockets.
When wiring 16. 1.4, the colors of phase line and neutral line should be different; The phase line (L) of the same residence should be uniform in color, the neutral line (N) should be blue, and the protection line (PE) must be yellow-green double-color line.
16.10.5 the construction of circuit pipes and lines, and the installation of electrical appliances and lamps shall comply with the provisions of the current relevant national standards and norms.
16.10.6 After the project is completed, provide the owner with the electrical engineering completion drawing.
16.2 quality requirements of main materials
16.2. 1 the specifications and models of electrical appliances and electrical materials should meet the design requirements and the relevant provisions of the current national electrical product standards.
16.2.2 the packaging of electrical appliances and electrical materials shall be intact, the appearance of materials shall be undamaged, and accessories and spare parts shall be complete.
16.2.3 plastic wire protection tubes and junction boxes must be flame retardant products, and their appearance must not be damaged or deformed.
16.2.4 The appearance of metal wire protection tube and junction box should be free from flatness and cracks, and there should be no burr in the tube, and the nozzle should be smooth.
16.2.5 The junction box and junction box used in the communication system shall be of the same series as the switches and sockets in the power distribution system.
16.3 construction points
16.3. 1 according to the position of electrical equipment, determine the pipeline direction, elevation and the position of switches and sockets.
2. How to thread the sewing machine correctly
Preparation materials: spool, sewing machine.
1. Insert the spool into the winding machine, and then thread the thread drawn from the spool through the small hole on the left.
2. Thread the wire through the small hole in the splint. Then go through the hole on the left.
3. Thread the line through the top circle and then pull it down.
4. After being pulled down, go through the hole below.
5. Wrap the drawn thread from bottom to top and pass through the hole on the left.
6. Finally, thread the thread through the pinhole below. The threading process of the sewing machine is completed.
3. How to thread
Insert the completed junction box into the open wall. Note: the junction box must be placed correctly, otherwise the outer panel will be skewed.
Calculate the distance between the pipe box and the ground and bend the pipe. Experienced construction team has undergone special treatment to ensure smooth bending and no pipe breakage. Now you can connect the pipe with the box, and the elbow is just lying on the ground smoothly. Experienced construction teams usually succeed once.
The new pipe can be threaded without steel wire, but if it is more standard to wear expensive audio wire or long-distance threading, steel wire should be used. Hook one end of the steel wire first to prevent the sharp end from scratching the inside of the pipeline.
Insert the steel wire into the tube slowly and push it slowly to avoid scratching the tube too fast and too hard. After the steel wire comes out from the other end, it is twisted with the steel wire and slowly pulled into the tube. The steel wire is actually the lead in this process.
After the wires reach the junction box, connect the pipes with matching connectors. As a concealed project, the interface link must be closed and intact.
The wire at the other end should be protected with a gland in time. The standard practice of the thread head part is to hide it all in the wire box, but the control of the thread head length is a detailed problem, and it is only a standard.
At this point, the threading part is basically completed, and only after a series of acceptance tests such as measuring whether the circuit is unobstructed can cement be poured. The threading process on the ceiling is basically the same, but generally, because there are more lamp heads on the ceiling, you only need to wear red live wire and blue zero line.
4. How does the sewing machine thread?
Shuttle winding
0 1
Separator needle. Turn the upper wheel on the side of the sewing machine to the end to raise the needle bar to the highest position. In this way, when you wind the spool, the needle will not suddenly fall off.
02
Take the spool core. The spool is a small circle under the needle of a sewing machine. The bobbin provides the bottom of the sewing machine, but it usually has no thread. Pull open the push plate on the bobbin, and then take the bobbin out of the bobbin sleeve; At this time, there is no wire winding on the top of the spool.
03
Put the coil on. Put the coil in the stitch at the top of the sewing machine. The coil should be able to rotate so that the wire can be pulled out of the coil counterclockwise.
04
Pull out the thread. Draw the thread with the thread end, and then wind the thread on the bobbin winding adjustment plate at the top of the sewing machine. If you have a relatively new sewing machine, there may be a chart on the top of the sewing machine to teach you how to do this step:
05
Start winding the spool. Pick up the spool and wind the thread 2-3 times.
06
Put the bobbin on the bobbin nail. It is a small nail, usually installed on the top of a sewing machine. Turn the bobbin nail to one side and fix it, and then wind it.
07
Start winding the spool. When holding the long thread end by hand and preparing to put it into the bobbin, press the pedal or the bobbin winding button to start winding the bobbin, which takes several seconds. This can ensure that the thread is tightly wound on the bobbin. Cut off the end of the short line.
08
End spool winding. Step on the pedal or reverse the upper wheel to make the bobbin completely wrap the thread. When the bobbin is full of thread, it is easy for your upper wheel to stop automatically; When the spool is completely wound, it should still be easy to rotate.
09
Take off the spool. Turn the bobbin nail and take off the bobbin. At this point, the thread should be connected to the spool and the coil at the same time, and the redundant part should be cut off with scissors, leaving a thread end of 5~8 cm. You have to start wearing sewing machines!
Thread a sewing machine
0 1
Re-needle the machine. Now you can start preparing to sew with the sewing machine. The large coil should be placed at the same position on the top of the sewing machine. The shuttle shell is placed under the small push plate, or directly under the needle or in front of the needle. Find the shuttle shell and open it.
02
Draw a few centimeters of thread from the spool. (Note that the blue-green line in the figure represents the bottom line, so as to distinguish the bottom line from the coil line. )
03
Put the bobbin back into the bobbin case. Insert the thread exposed from the bobbin into the groove of the bobbin sleeve. Some machines usually have a C-ring with a blade at the end, which is usually used to cut the thread end. Fix the spool. When pulling the cable, the spool will rotate counterclockwise. The end of the line should be pulled to the right to let it go easily. When paying off, push the push plate above the spool back to its original position.
04
Start winding the sewing machine. Pull out the coil thread at the top of the sewing machine. Thread the thread through the yarn guide on the top of the sewing machine-that is, the silver object fixed on the top of the sewing machine. Instructions may be printed on the top of the machine to teach you how to do this step.
5. How is the thread in the pipeline put on?
In-pipe threading method: use a steel wire that is not easy to bend, simmer it into a small hook in front with a tool, and then thread one end of the steel wire hook into the pipe by hand. When threading, rotate it to ensure that it can pass at the bend. When it passes through the other end, hang the iron wire on the hook of the steel wire, and then pull it back from the penetrating end and take it out, thus completing the pipeline threading.
Skills of wire threading;
Generally speaking, single-core wires 1.5 square wires are used for lighting lamps, 2.5 square wires for sockets, 4 square wires for more than three air conditioners, 6 square wires for incoming wires and two-color wires for grounding wires. The air conditioning lines and new houses are all arranged. Under normal circumstances, air conditioning lines should not be added. In addition, Yuba's wires should also use socket wires, and 2.5 square meters and 4 square meters are the most ideal effects.
Now PVC pipes are generally divided into 6 points and 4 points. If possible, use 6 points and indicate it in the budget. 4-point pipe can only pass through 1.5 lighting line, and a pipe can only pass through 3 lines at most. Six pipes can pass through 2.5 wires, and one pipe can only pass through 3 2.5 wires at most.
Extended data:
A, the role of line pipe:
1, wiring basis
Through-pipe wiring is the basis of cloth "live line", which lays the foundation for future line maintenance, replacement and home intelligence.
2. Protect the insulating layer
The wire passing through the tube can prevent the insulation layer of the wire from being damaged. If directly buried in cement mortar, silicate may corrode the insulation layer of the wire, leading to the decline of the insulation performance of the wire and causing short circuit.
3, to prevent fire
In case the insulation layer of the wire catches fire due to electrical short circuit, the wire can pass through the tube to prevent the flame from spreading, because the tube is made of flame retardant material and will not burn itself, so it is usually called "flame retardant tube". If the catheter is not used, it will be dangerous if there are other materials or flammable materials next to the wire.
4. Heat dissipation
Because the cross-sectional area of the conductor is determined by the load, there is usually a margin when wiring, but it can still alleviate the heating of the conductor caused by special circumstances.
Second, the wire tube matters needing attention
When threading, the total cross-sectional area of wires in the conduit must be less than 40% of the cross-sectional area in the conduit. In general, there should be no more than 3 lines of 16mm and no more than 4 lines of 20 mm. ..
Ceiling lighting line adopts hose (above 200mm); The ceiling inner pipe fixing brackets are arranged with the center lines of lamps in rows. When multiple socket wires and switches are connected in the socket box, arch head connection is not allowed, and LC type crimping cap should be used to crimp the main head before branch connection. The threaded pipe should be locked into the box, and the box internal thread head 375px must be circled.