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How to transform the circuit in the old house

Old houses will age if they live for a long time. At this time, it is necessary to rebuild, so as to ensure the safety of living. So, how to change the old house circuit? What are the precautions for circuit reconstruction of old houses? Let's have a look! How to reform the old house circuit

1. Find an experienced hydropower designer for overall design.

The circuit layout of the old house obviously does not conform to the electrical appliances of modern families. Therefore, we must invite experienced hydropower designers to design the whole project, and then consider what are the shortcomings and make modifications. Once the hydropower project is started, it will be very troublesome to modify it, so it must be planned in advance.

2. Carefully install the distribution box, circuit breaker and wiring.

Many old houses don't have distribution boxes, but use fuses, which are easy to burn out and cause safety problems. Erhu now has a lot of electrical appliances, so it needs to be equipped with new distribution boxes and circuit breakers, and each room should be controlled by separate lines.

3, choose a reasonable wire diameter, equipped with electrical appliances to consider the total load of the meter.

When designing the wire diameter, it should be as large as possible to meet the future demand; But when the old house was built, the total load was originally small, so the total power of the whole house should not be too high. Try to choose low power when buying electrical appliances.

4. Pay attention to supervision during construction.

It is best to invite professional experts to supervise. Electrical pipes and wires should be made of high-quality materials, and the circuit trough must be leveled with cement after installation. After leveling, cracks will appear in the wall. In addition, pay attention to the distance between strong and weak electricity.

The whole process of old house circuit transformation

1, clarificaiton pay-off

The project manager shall make technical disclosure to the workers, and then the foreman shall pay off according to the design requirements, and the groove shall be 50 mm wide ... The pay-off shall be accurate without any leakage.

2. Remove the original wire and switch socket.

Replace all original conduits, wires and switch sockets with brand products. The quality of the original wire can not be guaranteed, the conductivity is poor, and there is even the danger of leakage and fire. Old and new wires can't be mixed, because the resistance is different, which is prone to line failure.

3. Slotting and drilling

Pay attention to the slotting depth according to the actual lofting position of the construction site. Because cement mortar must be poured on it, the depth must be higher than the pipe diameter. The top surface cannot be slotted. If there is no ceiling on the top surface and wiring is needed (such as bay window), the wire slot should be cut shallowly on the top surface, and the wire should be wrapped with a thin conduit and then fixed in the slot. Where the wall and lintel passage need to be drilled, the hole diameter and hole spacing during drilling are generally100 mm; ; Wires and water pipes can't pass through a hole.

3. Although the standard of15 is horizontal, flat and vertical, with three elbows and one crossing box, this construction will increase a lot of empty slabs, which will affect the appearance and increase the cost. Pipes can be arranged obliquely in a straight line, so that the pipes have neither elbows nor boxes, which is convenient for construction and maintenance.

4. Oil pipeline

Arrange the pipeline according to the groove opened in the construction site. When piping is arranged in a room with water, electrical piping should be arranged on the wall and top. Strong and weak wires are not allowed to walk on the floor of the balcony in the kitchen and bathroom. The layout of the through-wall pipeline should be straight and try not to bend. If there is a bend, there should be no obvious crease at the corner.

The distance between strong and weak current must be greater than or equal to 150mm to prevent unclear cable signal. The distance between gas pipeline and electrical pipeline should not be less than 150 mm, and the height of switches installed in rows should be consistent, and the height difference should not be greater than 2mm. The spacing between cassettes is 10mm, the height of sockets from the ground is generally at least 300mm, and the switch position is generally 1300mm from the ground.

When threading, the sum of the cross-sectional areas of the wires passing through the conduit must be less than 40% of the cross-sectional area inside the conduit. In general, there should be no more than 3 lines of 16mm and no more than 4 lines of 20 mm. ..

Strong and weak wires should be laid through pipes, and different types of wires should not be installed in the same conduit. In the wiring process, the junction of the conduit and the pipe shall be connected with a junction box, and the wiring place shall be connected with a wiring cap, and the wiring shall be color-separated.

Ceiling lighting line adopts hose (above 200mm); Ceiling inner pipe fixing brackets are arranged in rows to install the center line of lamps. 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 line pipe should be locked into the box, and the line head 15cm in the box must be looped.

5, check the line

Use multimeter and ohmmeter to check whether the line is clear, short circuit or open circuit. Insulation resistance between wires is greater than or equal to 0.5mΩ, so as to prepare for installation of switch socket.

6. Install switch socket and lamp.

Before installation, it is not allowed to use the old socket at home, only the designated cable box can be used. Pay attention to the switch socket panel should be flat and close to the building surface. The same switch has the same cutting position, flexible operation and reliable contact.

The number of circuit wiring in the old house

1. Bedroom: Generally, there are 7 lines, including power line, lighting line, air conditioning line, TV feeder, telephone line, computer line and alarm line.

2. Corridor and hall: There should be two routes, including power lines and lighting lines.

3. Kitchen: There must be two lines, the power line and the lighting line.

4. Dining room: There should be three lines: power line, lighting line and air conditioning line.

5. Toilet: There should be three lines: power line, lighting line and telephone line.

6. Living room: Generally, the wiring in the living room should be 8-way: including power cord (2.5mm2 copper wire), lighting cord (2.5mm2 copper wire), air conditioning cord (4mm2 copper wire), TV cord (feeder), telephone line (4-core sheath line), computer cord (5-pin cord), intercom or doorbell cord (4-core sheath line optional, 2-core standby) and alarm cord (referring to)

7. Study room: Line 7; Includes power cord, lighting cord, TV cord, telephone cord, computer cord, air conditioning cord and alarm cord.

8. Balcony: There should be two lines, power line and lighting line.

What if the optical fiber is blocked after the renovation of the old house?

If the optical cable is broken, you can only call the operator to report the fault, and individuals can't repair the optical cable fault. If the optical fiber network is blocked, rather than the optical cable is broken, further tests are needed to determine where the specific fault point is. The failure of optical fiber network is not necessarily the interruption of optical fiber cable. Only by testing can the fault point be accurately judged, and then the fault can be eliminated according to the scope of the fault point.

Problems needing attention in circuit reconstruction of old houses

1. Before renovation, open several socket boxes and check the nozzle of the previously installed conduit. If the catheter has rusted, the original catheter can no longer be used and should be discarded. If the catheter is well preserved, the wires in the catheter can be replaced directly. If the catheter is made of standard plastic copper wire, it can still be used.

2. In order to save the decoration cost, the original circuit can be used without dismantling, but the newly added power socket and lighting circuit are best wired separately from the distribution box, because when all the original circuits are installed, the current is calculated and distributed according to the power load of each circuit branch. Arbitrary wiring or adding sockets and lighting appliances to the original circuit will cause the load of a single circuit to be too large, which will easily lead to the tripping or burning of the main power switch, and even lead to a serious fire.

3. The original socket circuit of the old house may have no grounding wire, which does not meet the safety standard of shared electricity and must be replaced. One way is to replace the main power box of the house and set the grounding in the power box; Another way is to consult the electricity management personnel of the property about the installation location and connection mode of the grounding wire, and never set the grounding wire privately.

4. According to the new national standard, the number of fixed sockets in houses should not be less than 12, but there are still many existing sockets in second-hand houses that can't meet this standard. If a large number of mobile sockets are used, when the current load increases, the mobile sockets will produce abnormal high temperature due to poor contact, laying a hidden danger for electric shock and electrical fire accidents.

5. For weak current projects such as telephone lines, network lines and video lines, the installation positions of various weak current sockets should be considered in advance before decoration. According to people's living habits now, it is best to reserve weak current sockets in major functional rooms (such as living room and bedroom), and telephone sockets must be considered in bathrooms to facilitate future life. As for the building intercom system, it is best to ask the property department to dismantle it in advance when decorating and reinstall it after completion. If it is really impossible to dismantle it, it should be wrapped or protected in advance to avoid damage during construction.

6. The circuit of the old house has changed a lot. At this time, it is necessary to follow the new circuit requirements. When using the socket of high-power electrical appliances, it is necessary to have an independent circuit and use a wire with a cross section of 4 square millimeters.

7. These lines should be protected against moisture. If it is the ground floor, the humidity is high, especially affected by the south. Too much humidity can easily affect the circuit. For example, telephone, optical fiber, broadband and other lines should not be laid on the ground to avoid moisture affecting the lines. In areas such as kitchens and bathrooms, the humidity will be heavier, and water pipes can be buried underground, but the circuit is recommended to be on the wall.

8. Decoration records should be made well, and the previous circuit layout will definitely be disrupted when it is renovated. In the process of decoration, we must pay attention to leaving change records in the form of photos and drawings to ensure that professionals can know the arrangement of lines when they need to be rectified and repaired in the future. At the same time, it is also related to whether adding a nail to the wall will pierce the water and electricity lines in the future, which cannot be ignored.