Is the length of the electrical foundation piping based on the centerline of the two nozzles?

Dressage. Engineering quantity calculation rules 1. All kinds of piping should distinguish different laying methods, laying positions, pipe materials and specifications, and take "extension meters" as the unit of measurement, without deducting the length of the junction box (box), lamp head box and switch box in the middle of the pipeline. 2. The engineering quantity of threading in the pipe should be calculated by distinguishing the nature of the line, the material of the wire, and the cross-section of the wire, and the "extension meter" of the single line.

The length of the line branch connector line has been comprehensively considered in the quota and shall not be calculated separately. When the cross-section of the wire in the lighting circuit is greater than or equal to 6mm2, the corresponding project of power line threading should be executed. 3. The wiring quantity of the wire clamp should be distinguished from the wire clamp material (plastic, porcelain), wire type (two wires, three wires), laying position (in wood, brick, concrete) and wire specifications, and the line "extension meter" should be used as the unit of measurement.

Fourth, the insulator wiring engineering quantity should be distinguished from the form of insulator (needle, drum, butterfly), insulator wiring position (along the roof truss, beams, columns, walls, across the roof truss, beams, columns, wood structure, ceiling, brick, concrete structure, along the steel bracket and steel cable), wire cross-sectional area, the line "extension meter" as the unit of measurement. The insulator is concealed, and the down conductor is calculated according to the length of the distance from the line support point to the lower edge of the ceiling. 5. The amount of slot plate wiring should be distinguished from the material of the slot plate (wood, plastic), the wiring position (wood structure, brick, concrete), the wire section, and the line type (two wires and three lines), and the line "extension meter" should be used as the unit of measurement.

Sixth, the plastic sheath line surface laying engineering quantity, should distinguish the wire cross-section, the number of wire cores (two cores, three cores), laying position (wood structure, brick concrete structure, along the steel cable), to a single line each bundle "extension meters" as the unit of measurement. 7. The engineering quantity of wiring in the trunking should be distinguished from the wire cross-section, and the "extension meter" of a single line should be used as the unit of measurement. 8. The amount of steel cable erection engineering should be distinguished from the diameter of round steel and steel cable (6, 9), and the distance between the inner edge of the wall (column) shown in the figure should be calculated in the unit of measurement of "extension meter", without deducting the length occupied by the tensioning device.

9. The amount of production and installation of bus tensioning device and steel cable tensioning device should be distinguished from the bus section and the diameter of the flower basket bolt) with "set" as the unit of measurement. 10. The installation quantity of the ribbon bus in the workshop should be distinguished from the bus material (aluminum, steel), bus cross-section, and installation position (along the roof truss, beams, columns, walls, across the roof truss, beams, columns) with "extension meters" as the unit of measurement. Ten.

1. The installation quantity of the junction box should be distinguished from the installation form (surface installation, concealed installation) and the half-circumference of the junction box, with "one" as the unit of measurement. Ten.

Second, the installation quantity of the junction box should be distinguished from the installation form (surface, concealed, on the steel cable) and the type of junction box, with "one" as the unit of measurement. Ten.

3. The reserved wires of lamps, bright and dark switches, sockets, buttons, etc., have been integrated in the corresponding items and are not separately counted.

Ten. Fourth, the wiring into the switch box, cabinet, board of the reserved line, the length specified in the table below, respectively, included in the corresponding engineering quantity.

Piping includes wire pipes, steel pipes, explosion-proof pipes, plastic pipes, hoses, corrugated pipes, etc.

Piping laying requirements.

1. When the piping is open, the pipeline should be laid horizontally and vertically along the surface of the building, but it should not be laid on the boiler, flue and other heating surfaces.

2. The allowable deviation value of the horizontal or vertical laying of the open piping is 3mm within 2m, and the total length should not exceed 1 2 of the inner diameter of the pipe.

3. When the piping is dark, the wire protection pipe should be laid along the nearest route, and the bending should be reduced, and the pipeline should be shortened, so as to save costs and reduce costs.

4. The ambient temperature when laying plastic pipes should not be lower than -15, and matching plastic junction boxes, lamp head boxes, switch boxes and other accessories should be used. When the plastic pipe is grooved and laid in the brick wall, it must be protected by cement mortar with a strength of not less than m10, and the thickness should not be less than 15mm.

5. The plastic pipe should be fixed when it enters the junction box, lamphead box, switch box or distribution box. When the steel pipe enters the lamp head box, switch box, wire box, junction box and distribution box, the dark pipe can be fixed by welding, and the exposed box (box) of the pipe mouth should be less than 5mm; The exposed piping should be fixed with a lock nut or retainer cap, and the thread fastener that exposes the lock nut is 2 4 buckles.

6. In order to ensure that the plastering layer is not exposed after dark laying, and to prevent the plastering surface from falling off due to rust and affecting the quality of the entire project, the distance between the pipeline and the surface of the main body of the building and structure should not be less than 15mm.

7. There is no open and dark piping, it is strictly forbidden to cut with gas and electric welding, there should be no iron filings in the pipe, and the nozzle should be smooth.

In dusty and humid places, the nozzle, the pipe connection and the upper mouth of the vertical laying that does not enter the box (box) should be sealed after threading. When connected with the equipment, the pipe should be connected to the equipment, if it cannot be connected, a protective hose should be added at the nozzle to introduce into the equipment, and the hose joint must be connected, and in the outdoor or wet house, the nozzle should also add a waterproof elbow.

8. The buried pipeline should not pass through the equipment foundation, and if it wants to pass through the building foundation, it should be protected by a protective pipe; The net distance from the surface of the pipe buried in the wall or concrete should not be less than 15mm; The floor of the hidden piping nozzle should not be less than 200mm; The pipeline entering the floor-mounted distribution box should be arranged neatly, and the nozzle should be not less than 50mm higher than the foundation surface.

9. Dark piping should be crossed as much as possible, such as crossing, large-diameter pipes should be placed under small-diameter pipes, and the spacing of rows of dark pipes should be greater than or equal to 25mm.

10. The pipeline should have a compensation device at the place where it passes through the expansion joint and settlement joint of the building. When the hard plastic pipe is laid along the surface of the building, a compensation device should be installed every 30m in the straight section.

Electrical piping is roughly calculated according to the total cross-sectional area of the wires worn in the pipe, and under normal circumstances, the specification stipulates that the total cross-sectional area of the wire does not exceed 40% of the inner diameter of the pipe, and also stipulates that the bending radius of the pipe is greater than or equal to more than 6 times the diameter of the pipe. Of course, the wiring also needs to consider the number of pipe bends, if you do the information, you should take a good look at the electrical engineering acceptance specifications, more detailed.

When calculating the wiring length of electrical wiring, some wire lengths = (piping calculation length + wire reserved length) The same cross-section RVV-2 * is two, VV22 4 35+1 16, that is, 4 35mm2 plus 1 16mm2,

The corresponding pipe diameter is selected according to the cross-sectional area and number of wires.

1.The junction box is the length of the electrical piping in the line. The pipeline elbow exceeds the distance specified in the code and.

When the number of elbows and the pipeline has branches, the transition box that must be set up, and the box that is reserved for the pipeline to the load terminal are all junction boxes. Its function is to facilitate threading, splitting and transition wiring.

2.Switch box, socket box, lamp box are all terminal boxes for these three types of installation, which are used for installing fixed panels and wiring in the box when installing switches and socket lamps.

3.Whether the junction box and switch box are metal boxes or PVC plastic boxes, the H86 box is commonly used in the installation project, with a box width of 86mm and a box depth of 50mm70mm (h86*s50, h86*s60, h86*s70, h86*s80, and 146h*s h*s60).

4.When the pipeline line is long, it is advisable to install a junction box appropriately. The straight part does not exceed 30m, one bend does not exceed 20m, two bends do not exceed 15m, and three bends do not exceed 8m.

If the pipeline exceeds the following lengths, a junction box should be installed, and its position should be convenient for threading. 30m without bending; 20m when there is a bend; 15m with two bends; There are three bends at 8m.

When the pipe wiring is bifurcated or cannot reach a length, a junction box must be installed.

In the case of connectors, a junction box should be installed!

It is calculated according to the plan, the length of this line is the length of the pipe *4, and the mark marked on the plan is the line mark, which is the number of roots of the line in the actual construction. The annotations in the system diagram are the annotations of the loop.

Yes, the current specification stipulates that lamps and lanterns also add protection lines, that is, 3 lines, so the length of the piping is multiplied by 3 to the wiring length, but different piping may have different threading roots, you had better refer to the drawings to mark the number of lines, different designs are slightly different, generally 2 lines, 3 lines are not marked. Therefore, the wiring length should be: pipe length * number of labels.

For example, if the mark between the lamps is 4, the line length is equal to = tube length * 4. In addition, there are generally 2 wirings (fire and control) at the switch, but most of them are not marked.

In two cases, if it is the end of the socket box, there is only that one tube, both the length is, if it is a through-line socket box, that is, the socket box that passes through the middle of the whole feeder, two pipes are needed, one in and one out (broken zero and continuous fire) both meters, and other circuits are also this calculation method A tube wears three wires (l n pe).

Yes, it is the actual length of the piping.

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The electrical piping is calculated according to the length shown in the figure, without deducting the intermediate wire box, and not adding other reserved lengths, which has been considered in the quota loss. There are no other additional lengths for wiring, which must be calculated according to the rules.

In case of iron shell Tianguan, the wire starter, knife switch and so on should be reserved.