How much does it cost per square meter for 20 story water supply and drainage, main cable, grounding

The standards are different from place to place, and it depends on the local economic development.

Labor cost of the standard layer of the main body of the high-rise: 130-140 yuan m2 (the standard layer adds 20-30 yuan m2 on this basis);

Decoration labor cost: 75-85 yuan m2;

Water, heating (excluding floor heating, floor heating area of 35-38 yuan m2), electricity and weak current labor costs: 35-40 yuan m2.

Electrical, if only in the case of lighting and sockets, about 12 yuan.

Water supply and drainage are only about 7 to 8 yuan.

The electrician job here in Taizhou is 9-20 yuan, and if you are in Shanghai, you can ask those electrician masters to see! The hydraulics are not very clear.

Electricians, plumbers, and workers are counted in an square.

Wires, network cables, switches, sockets, etc., according to your estimated estimates, there are many that can be returned!

Labor cost of the standard layer of the main body of the high-rise: 130-140 yuan m2 (the standard layer adds 20-30 yuan m2 on this basis); Decoration labor cost: 75-85 yuan m2;

Water, heating (excluding floor heating, floor heating area of 35-38 yuan m2), electricity and weak current labor costs: 35-40 yuan m2.

1. Strong and weak current lines need to be wired separately A major taboo in circuit transformation is that the construction team will store all the lines together for the convenience of construction. The consequence of this is interference between lines, resulting in unstable signals and leaving fire hazards.

Therefore, when the circuit is transformed, the strong and weak currents should be separated from the wiring, and it is strictly forbidden to share a tube and a bottom box with strong and weak currents, and the parallel spacing of strong current lines should not be less than 30cm, preferably 50cm, and the crossing must be at right angles.

The weak current threading pipe should be made of steel pipe or hard PVC pipe, PVC pipe is relatively cheap and commonly used, but the signal shielding effect is not as good as copper pipe. Therefore, if there is a local interference source in the line and the minimum clear distance requirement cannot be met, the steel pipe should be used as the threading pipe.

2. In order to avoid signal interference, weak currents such as network cables, ** lines, and cable TV lines should be threaded separately in the circuit construction, and should not be worn in the same tube.

3. Lay the pipe first and then route the line Weak current construction is the same as strong electricity, and the pipeline should be installed first and then threaded during construction, so as to avoid the phenomenon that the line cannot be twitched when changing the line in the future.

4. Avoid too many lines in the same pipe When laying, it should be changed depending on the number of wires worn in the tube, and the same pipe should not exceed four, and the wires are prohibited from filling all the space in the pipe. The diameter utilization rate of straight pipes should be 50% to 60%, and the diameter utilization rate of elbows should be 40% to 50%.

5. Avoid taking a broken right-angle bend When routing the line, pay attention to the wire pipe should not be directly broken to the right angle, which is easy to cause the line to not pass through, and the impact on the signal is also very large, it is best to use a large bend connection.

If you do it manually, you will only do it. Electrical: 30 Water Supply and Drainage:

6 Fire water: 10 Loss and laughter: 12 Sprinkler:

20 Weak electricity, it's hard to say, it's about 20% of the cost You can calculate it according to the cost, and the cost of selling Zheng Gong is about 25-30, depending on whether your content is good or not, consider it comprehensively.

100kw equipment requires 95 square millimeters of wire.

Single-phase load per kilowatt, motor per kilowatt 2a (cos&=, calculate the current and then select the wire.

Single-phase load 100 kW = 450A (if it is divided into 3 phases, divide by 3.) ), motor 100 kW = square millimeter copper power cord (bx) safe current carrying capacity 126a.

100kw power supply according to three-phase power supply, the current is about, choose 95 square copper core wire, 95 cable current carrying capacity is about 231A. The current carrying capacity of the wire has a great relationship with the laying method and the environment, and there should be a certain margin, so it is appropriate to choose 95 copper core wire.

KW needs to use 35 square copper cable, 380V three-phase 100KW load current is estimated at 180A, it is recommended to use 3 * 120 + 1 * 95 copper core cable or larger model so that it is safer, 100KW according to the three-phase power supply, the current is about 1787A, choose 95 square copper core wire, 95 cable current carrying capacity is about 231A.

2. Generally, the phase wire of the three-phase wire adopts 2x300mm2 single-core copper core cable, and each phase is installed in parallel with two copper core cables of 300 square millimeters of the same specification, and the zero line adopts a 300mm2, and the grounding wire adopts a 300mm2 single-core copper core cable.

Such a large power should be powered by a three-phase power supply p=.

P: Power(W); u: voltage (v) ; i: Current (a) Cos power factor.

Calculation process: The current is calculated according to this formula, i=p (

Then look for the wire and cable manual according to your wire laying method and environmental heat dissipation conditions, etc., and select the specifications of the wire according to the current.

100kw equipment requires 70 square millimeters of wire.

According to the formula p= 3*u*i*cos; i=p/√3*u*cosφ

p: load power.

u: power supply voltage.

i: Load current.

COS: Power factor (resistive load COS = 1, inductive load COS 1, motor COS

After calculating and checking the power wire comparison table, 100kw equipment needs 70 square millimeters of wire.

100kw equipment requires 70 square millimeters of three-core copper wire.

According to the power formula p=have:i=p (calculated according to the three-phase mains, the power factor can be seen by checking the power wire comparison table, and the three-core copper cable of 70 square millimeters can be selected.)

The relationship between the cable cross-section and the estimation of the current is as follows:

1. For wires of square millimeters, the number of truncations can be multiplied by 5 times.

2. For a wire of square millimeters, the cross-sectional area can be multiplied by 4 times.

3. For the square millimeter wire, the cross-sectional area can be multiplied by 3 times.

4. For wires of square millimeters, the number of cross-sectional areas can be multiplied.

5. For the square millimeter wire, the cross-sectional area can be multiplied by 2 times.

Calculate with the "Wire Selection Calculator": three-phase copper: 95 square 130kw, 70 square 107kw is too dangerous without considering the safety factor!

- -They're all floating clouds, landlord, let me tell you.

100 divided equals 125

125 divided by 3 equals 41

You can use 42mm2 Honghe copper core wire, and three (sedan electric) zero wires are 50mm Honghe copper core wires. The grounding wire is Honghe copper core wire. The branch wire is 6mm Honghe copper core wire.

Veterans don't explain.

p=uicosφ

p power u voltage i current cos power factor.

Calculate the current according to this formula, then find the wire and cable manual according to your wire routing method and environmental conditions, and select the specifications of the wire according to the current.

Referring to the opinion on the 3rd floor, it is quite practical.

If you do it manually, you will only do it.

Electrical approx. 30

Water supply and drainage: 6 fire water: 10

Fire electricity: 12

Spray: 20 weak electricity, it is difficult to say, according to the cost of about 20% of the calculation.

You can calculate it according to the cost, and the labor cost is about 25-30, depending on whether your content is good or not, and consider it comprehensively.

Hello, weak current generally refers to communication and multi-** and fire-fighting intelligent equipment. General parcel network cables, cables, audio cables, equipment control cables, fire security cables and other integrated wiring. The specific cost needs to be budgeted according to the amount of work.

Network,**, surveillance, video intercom, TV, anti-theft, wireless AP, wireless audio, access control, and projection equipment.