CN116093829A - Construction process of electric installation engineering - Google Patents

Abstract

The invention discloses an electrical installation engineering construction process, and relates to the technical field of electrical construction. In order to solve the efficiency problem, the pipe fitting and threading device specifically comprises a pipe fitting and threading in the pipe; installing the tubing on a hanger or a bracket or a wall, penetrating, fixing and connecting a lead; the installation distribution box is connected with the line; punching a box body of the distribution box, fixing the box body with a bracket or a wall, and connecting the connected line ends with components of the distribution box; installing a bridge and laying cables; and leading out the power lighting main lines of all the low-voltage distribution chambers, erecting a bridge, and connecting the power lighting main lines by using cables. According to the invention, the summarized form is adopted, each layer is firstly arranged and constructed, after construction is finished, the vertical shaft support cables are laid and are distributed and installed with each layer, and finally grid connection and power connection are carried out, so that the reliable convergence of each layer can be ensured, the condition that installation cannot be carried out is prevented, the construction quality and efficiency are improved, and the construction period is shortened.

Description

Construction process of electric installation engineering

Technical Field

The invention relates to the technical field of electric construction, in particular to an electric installation engineering construction process.

Background

The electric construction refers to work related to electric equipment installation, and comprises fixing, installing and debugging contents of a bracket, wires, cables, a power distribution cabinet, electric elements and the like, wherein the span is large, the basic wiring needs to cover the whole building area, the construction contents are more, and the engineering quantity is large.

Especially for large-scale intensive high-rise buildings such as shops, stations, office buildings and the like, each floor of the building needs to be provided with a power distribution system independently, all the power distribution systems need to be connected in a grid-connected mode by utilizing a vertical shaft, and the engineering quantity is large.

In the existing electrical construction process, the lack of a complete construction process facing to a dense high-rise building leads to independent construction of each layer in actual construction, and different setting modes of a standard, a bracket, a distribution room and the like can appear in final grid connection treatment or grounding lightning protection treatment, so that the situations of incapability of grid connection or reliable grounding lightning protection and the like can appear.

Therefore, the invention provides an electric installation engineering construction process, which aims to fill the defects of the existing foundation, and provides a complete and reliable construction process aiming at high-rise dense buildings, so that the construction is reliably performed, the construction quality and efficiency are improved, and the construction period is shortened.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides an electric installation engineering construction process.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

an electrical installation engineering construction process comprises the following steps:

s1: installing a pipe and threading in the pipe; installing the tubing on a hanger or a bracket or a wall, penetrating, fixing and connecting a lead;

s2: the installation distribution box is connected with the line; punching a box body of the distribution box, fixing the box body with a bracket or a wall, and connecting the connected line ends with components of the distribution box;

s3: installing a bridge and laying cables; leading out power illumination main lines of all low-voltage distribution chambers, erecting a bridge, and connecting the power illumination main lines by using cables;

s4: the vertical shaft device is electrically installed; setting up a longitudinal frame at a vertical shaft position, laying a longitudinal cable, leading out cables of a distribution room without a layer, communicating the cables with the longitudinal cable, and then connecting the cables with a grid;

s5: lightning protection is grounded; and (5) installing a grounding device for lightning protection.

Preferably: the step S1 comprises the following steps:

s11: laying and connecting pipelines; fixing the steel pipes on a hanger, a bracket or a wall one by one according to a designed path, and welding and fixing adjacent steel pipes by using an elbow or a straight connector;

s12: connecting a pipeline box inlet and a box; connecting a pipeline box feeding box and a box to a pipeline by using a grounding clamp;

s13: welding a ground wire; installing a grounding clamp on the outer wall of the steel pipe, and connecting the grounding clamp to the ground by utilizing a welding steel bar mode;

s14: binding corners, head ends and tail ends of the pipelines to the hanging frame or the bracket by using iron wires, and equally-spaced-arrangement and fixation of straight-line positions;

s15: selecting a wire: selecting the specification and model of the Zecounty according to the design to be used as standby; the method comprises the steps of carrying out a first treatment on the surface of the

S16: a pipe sweeping; cleaning the pipeline, impurities in the box and the box, cleaning impurities or rust adhered on the surface by using a steel brush, and then blowing out by using an air gun;

s17: threading; penetrating the lead into the pipe by using a threading device, and reserving the lead at the pipe orifice, the pipeline box and the box as wiring allowance;

s18: wiring; and connecting the wires according to a circuit diagram, and mounting the electric components.

S19: detecting insulation; and the connected circuit is subjected to insulation detection by using a megohmmeter, and the insulation resistance is more than 1.0 megaohm.

Further: in the step S11, when the length of the dark piping is greater than L, a junction box is provided in the middle of the length of the dark piping, wherein L is a limit length, which is associated with the number of turns of the dark piping; the transverse arrangement direction and the longitudinal arrangement direction of the exposed piping are respectively parallel and perpendicular to the ground, and the elbow is fixed on the hanging bracket or the wall by using a pipe clamp.

Based on the scheme: in the step S12, when the pipeline enters the box and the box, the pipe orifice is 3-5 mm higher than the inner wall of the box and the box, and the distance between the steel pipe orifice connected with the equipment and the ground is more than 200mm.

Among the foregoing, the preferred one is: in the step S13, the welding length is more than 6-8 times of the diameter of the steel pipe, and the welding surface is more than 3.

As a further scheme of the invention: in the step S18, when the lead wire is connected with the electric component, the lead wire with the section of 10mm < 2 > or less is directly connected with a terminal of the electric component; the wire with the section of less than 2.5mm2 is compacted by using tin coating and then is connected with a terminal of an electric component.

Meanwhile, in the step S3, the method includes the following steps:

s31: installing an angle steel bracket and a suspender, punching holes along the wall in the power distribution vertical shaft, and fixing the angle steel bracket by using expansion bolts or embedded bolts; then installing a hanging rod at the bottom of the steel frame;

s32: installing a bridge connecting plate; the bridge connecting plate is mounted on the angle steel bracket by bolts, and nuts are arranged on the outer side and screwed up;

s33: installing a grounding trunk line, and laying galvanized flat steel along the arrangement path of the angle steel bracket to serve as the grounding trunk line; the grounding trunk line is electrically connected with the angle steel bracket by using steel bars or wires;

s34: installing a wire slot; fixing the wire slot at the bottom of the suspender; a hanging bracket or a support is arranged at a specific position of the metal wire slot;

s35: bridge cleaning and cable detection; cleaning sundries and burrs in the pipe of the bridge; checking the insulation resistance of the cable;

s36: and laying cables one by one according to paths of the bridge frame and the wire slots, and fixing the cables by using fixing cards.

As a preferred embodiment of the present invention: in the step S34, the specific position of the metal wire slot comprises a straight line section not more than 3m or a joint of the wire slot, a head end of the wire slot, a terminal, a position of 0.50m of an in-out junction box and a corner of the wire slot.

Meanwhile, in the step S4, the longitudinal frame comprises a bracket for plugging the bus, a bracket for a cable bridge, a bracket for a cable and a bracket for a box body; which comprises the following steps:

s41: installing a plugging bus duct, a cable bridge and an exposed line pipe;

s42: laying a longitudinal cable and an electric wire;

s43: installing an electric box body and a plug-in bus plug-in box body;

s44: installing an electric vertical shaft and grounding dry wiring and branch lines;

s45: installing an electric lighting lamp and an overhaul socket in the electric vertical shaft;

s46: and closing the shaft hole, detecting electrical equipment and performing test operation.

As a more preferable scheme of the invention: in the step S5, the neutral point of the transformer is grounded, the protection of the electrical equipment is grounded, the grounding of an elevator machine room, a fire control room, a telephone machine room, a computer room and the like share a uniform grounding electrode, and the grounding resistance is smaller than 1.0 ohm; which comprises the following steps:

s51: a hot dip galvanized flat steel is laid on a bridge frame from the power transformation and distribution room to the strong electric shaft, and the power transformation and distribution room is grounded and connected with the strong electric shaft;

s52: connecting the cable bridge, the bus duct shell and the bracket thereof with a grounding trunk;

s53: the non-hot galvanizing bridge is connected in a bridging manner to ensure the grounding electrical connection;

s54: respectively spreading hot dip galvanized flat steel in strong and weak current shafts in a through manner, wherein each three layers of flat steel are connected with the steel bars of the floor in an equipotential manner and are connected with equipotential grounding boxes arranged in each layer of strong and weak current room;

s55: PE terminal blocks and bridge frames of all distribution boxes in the strong current vertical shaft are reliably connected with wiring copper bars in the equipotential junction boxes by BV-1X10mm < 2 >;

s56: connecting a neutral line of the output end of the uninterruptible power supply with a grounding main line directly led by a grounding device, and repeatedly grounding;

s57: the bottom ends and the top ends of the metal pipelines and the metal objects which are vertically laid are connected with the lightning protection device;

s58: the protection tube of various wires/cables led out of the building, the metal sheath of the armored cable, the shell of the enclosed bus and the I-type lamp are reliably connected with the grounding wire;

s59: an I-level test surge protector is arranged on a low-voltage bus of a power transformation and distribution room, and a III-level test surge protector is arranged in a distribution box of a weak electric machine room; the roof outdoor fan and the outdoor lighting distribution box are internally provided with I-level test surge protection;

s510: the distribution line led out from the distribution box to the roof electric equipment and the control button box passes through a steel pipe or a steel hot galvanizing cable groove box; one end of the steel pipe and one end of the groove box are connected with the distribution box and the PE wire, and the other end of the steel pipe and the groove box are connected with the shell of electric equipment and the protective cover and are connected with the roof lightning protection device nearby; when the steel pipe is interrupted by the connection equipment, jumper connection is adopted.

The beneficial effects of the invention are as follows:

1. according to the invention, the summarized form is adopted, each layer is firstly arranged and constructed, after the construction is finished, the vertical shaft support cables are laid and are installed with each layer of power distribution, and finally grid connection and power connection are carried out, so that the reliable convergence of each layer can be ensured, the condition that installation cannot be carried out is prevented, the construction quality and efficiency are improved, and the construction period is shortened.

2. According to the invention, after each layer of construction, insulation detection is carried out on cables and electricity, so that the construction quality is ensured, the potential safety hazard is reduced, and the detection is carried out by adopting an ohmmeter, so that the method is more convenient.

3. According to the invention, the vertical holes are closed, then the electrical equipment is detected and tested, so that the chimney effect can be effectively prevented, and the safety is improved.

4. According to the invention, the grounding treatment is adopted for the materials of all the wires, and the grounding main line of the grounding device is utilized for conducting electricity, so that the electrification of metal such as a shell and a bracket caused by electric leakage or electrostatic induction can be effectively prevented, and the safety is further improved.

5. According to the invention, the surge protectors are arranged on the distribution room, the machine room, the distribution box, the lighting trunk and the like, and when the current is large, the current of each part can be electrically protected in a shunt mode, so that the overcurrent burning of each part is prevented.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the application and to provide a further understanding of the application with regard to the other features, objects and advantages of the application. The drawings of the illustrative embodiments of the present application and their descriptions are for the purpose of illustrating the present application and are not to be construed as unduly limiting the present application. In the drawings:

fig. 1 is a schematic flow chart of an electrical installation engineering construction process provided by the invention.

Detailed Description

In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the present application described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are used primarily to better describe the present application and its embodiments and are not intended to limit the indicated device, element or component to a particular orientation or to be constructed and operated in a particular orientation.

Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

In addition, the term "plurality" shall mean two as well as more than two.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The technical scheme of the patent is further described in detail below with reference to the specific embodiments.

Embodiments of the present patent are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present patent and are not to be construed as limiting the present patent.

Example 1:

an electrical installation engineering construction process, as shown in fig. 1, comprises the following steps:

s1: installing a pipe and threading in the pipe; installing the tubing on a hanger or a bracket or a wall, penetrating, fixing and connecting a lead;

s2: the installation distribution box is connected with the line; punching a box body of the distribution box, fixing the box body with a bracket or a wall, and connecting the connected line ends with components of the distribution box;

s3: installing a bridge and laying cables; leading out power illumination main lines of all low-voltage distribution chambers, erecting a bridge, and connecting the power illumination main lines by using cables;

s4: the vertical shaft device is electrically installed; and erecting a longitudinal frame at the vertical shaft position, laying a longitudinal cable, leading out cables of the distribution room without the layer, and connecting the cables with the longitudinal cable and then connecting the cables with a grid.

The step S1 comprises the following steps:

s11: laying and connecting pipelines; fixing the steel pipes on a hanger, a bracket or a wall one by one according to a designed path, and welding and fixing adjacent steel pipes by using an elbow or a straight connector;

s12: connecting a pipeline box inlet and a box; connecting a pipeline box feeding box and a box to a pipeline by using a grounding clamp;

s13: welding a ground wire; installing a grounding clamp on the outer wall of the steel pipe, and connecting the grounding clamp to the ground by utilizing a welding steel bar mode;

s14: binding corners, head ends and tail ends of the pipelines to the hanging frame or the bracket by using iron wires, and equally-spaced-arrangement and fixation of straight-line positions;

s15: selecting a wire: selecting the specification and model of the Zecounty according to the design to be used as standby; (the colors of the wires are easy to distinguish, the colors are uniform, the protective ground wire (PE) is an insulated wire with yellow and green alternating, and the zero wire is a light blue insulated wire);

s16: a pipe sweeping; cleaning the pipeline, impurities in the box and the box, cleaning impurities or rust adhered on the surface by using a steel brush, and then blowing out by using an air gun;

s17: threading; penetrating the lead into the pipe by using a threading device, and reserving the lead at the pipe orifice, the pipeline box and the box as wiring allowance;

s18: wiring; and connecting the wires according to a circuit diagram, and mounting the electric components.

S19: detecting insulation; and the connected circuit is subjected to insulation detection by using a megohmmeter, and the insulation resistance is more than 1.0 megaohm.

In the step S11, when the length of the dark piping is greater than L, a junction box is provided in the middle of the length of the dark piping, wherein L is a limit length, which is associated with the number of turns of the dark piping; the transverse arrangement direction and the longitudinal arrangement direction of the exposed piping are respectively parallel and perpendicular to the ground, and the elbow is fixed on the hanging bracket or the wall by using a pipe clamp.

Item times	Bending number of distribution pipe	Maximum allowable distance L (m)
			1	0	30
2	1	20
			3	2	15
4	3	8

The upper table is a matching table of the bending number and the L length of the hidden piping

In the step S12, when the pipeline enters the box and the box, the pipe orifice is 3-5 mm higher than the inner wall of the box and the box, and the distance between the steel pipe orifice connected with the equipment and the ground is more than 200mm.

In the step S13, the welding length is more than 6-8 times of the diameter of the steel pipe, and the welding surface is more than 3.

In the step S18, when the lead wire is connected with the electric component, the lead wire with the section of 10mm < 2 > or less is directly connected with a terminal of the electric component; the wire with the section of less than 2.5mm2 is compacted by using tin coating and then is connected with a terminal of an electric component.

The step S3 comprises the following steps:

s31: installing an angle steel bracket and a suspender, punching holes along the wall in the power distribution vertical shaft, and fixing the angle steel bracket by using expansion bolts or embedded bolts; then, hanging rods are arranged at the bottom of the steel frame, the distance between the hanging rods is 1.5-3m, and the cantilever section is smaller than 1m;

s32: installing a bridge connecting plate; the bridge connecting plate is mounted on the angle steel bracket by bolts, and nuts are arranged on the outer side and screwed up;

s33: installing a grounding trunk line, and laying galvanized flat steel along the arrangement path of the angle steel bracket to serve as the grounding trunk line; the grounding trunk line is electrically connected with the angle steel bracket by using steel bars or wires;

s34: installing a wire slot; fixing the wire slot at the bottom of the suspender; a hanging bracket or a support is arranged at a specific position of the metal wire slot;

s35: bridge cleaning and cable detection; cleaning sundries and burrs in the pipe of the bridge; checking the insulation resistance of the cable: not less than 1200 megaohms at 10 kilovolts;

s36: and laying cables one by one according to paths of the bridge frame and the wire slots, and fixing the cables by using fixing cards.

In the step S34, the specific position of the metal wire slot comprises a straight line section not more than 3m or a joint of the wire slot, a head end of the wire slot, a terminal, a position of 0.50m of an in-out junction box and a corner of the wire slot.

In the step S4, the longitudinal frame comprises a bracket for plugging a bus, a bracket for a cable bridge, a bracket for a cable and a bracket for a box body; which comprises the following steps:

s41: installing a plugging bus duct, a cable bridge and an exposed line pipe;

s42: laying a longitudinal cable and an electric wire;

s43: installing an electric box body and a plug-in bus plug-in box body;

s44: installing an electric vertical shaft and grounding dry wiring and branch lines;

s45: installing an electric lighting lamp and an overhaul socket in the electric vertical shaft;

s46: and closing the shaft hole, detecting electrical equipment and performing test operation.

In this embodiment, adopt the form of summarizing, arrange the construction to every layer earlier, after the construction finishes, lay the shaft bracket cable and install it with every layer distribution again, carry out the electric power on-grid at last, can guarantee that each layer reliably gathers, prevent the condition that can't install to improve construction quality and efficiency, shortened the time limit for a project.

In addition, after each layer of construction, the cable and the electricity of the cable are insulated and detected, so that the construction quality is guaranteed, the potential safety hazard is reduced, and the cable and the electricity are detected by adopting an ohmmeter, so that the cable and the electricity are more convenient and faster.

In addition, the invention detects the electrical equipment after closing the vertical holes and tries to run the electrical equipment, thereby effectively preventing the chimney effect and improving the safety.

Example 2:

an electrical installation engineering construction process is shown in figure 1, and aims to solve the lightning protection problem; the present example was modified on the basis of example 1 as follows: it also includes S5: lightning protection is grounded; and (5) installing a grounding device for lightning protection.

In the step S5, the neutral point of the transformer is grounded, the protection of the electrical equipment is grounded, the grounding of an elevator machine room, a fire control room, a telephone machine room, a computer room and the like share a uniform grounding electrode, and the grounding resistance is smaller than 1.0 ohm; which comprises the following steps:

s51: a hot dip galvanized flat steel is laid on a bridge frame from the power transformation and distribution room to the strong electric shaft, and the power transformation and distribution room is grounded and connected with the strong electric shaft;

s52: connecting the cable bridge, the bus duct shell and the bracket thereof with a grounding trunk;

s53: the non-hot galvanizing bridge is connected in a bridging manner to ensure the grounding electrical connection;

s54: respectively spreading hot dip galvanized flat steel in strong and weak current shafts in a through manner, wherein each three layers of flat steel are connected with the steel bars of the floor in an equipotential manner and are connected with equipotential grounding boxes arranged in each layer of strong and weak current room;

s55: PE terminal blocks and bridge frames of all distribution boxes in the strong current vertical shaft are reliably connected with wiring copper bars in the equipotential junction boxes by BV-1X10mm < 2 >;

s56: connecting a neutral line of the output end of the uninterruptible power supply with a grounding main line directly led by a grounding device, and repeatedly grounding;

s57: the bottom ends and the top ends of the metal pipelines and the metal objects which are vertically laid are connected with the lightning protection device;

s58: the protection tube of various wires/cables led out of the building, the metal sheath of the armored cable, the shell of the enclosed bus and the I-type lamp are reliably connected with the grounding wire;

s59: an I-level test surge protector is arranged on a low-voltage bus of a power transformation and distribution room, and a III-level test surge protector is arranged in a distribution box of a weak electric machine room; the roof outdoor fan and the outdoor lighting distribution box are internally provided with I-level test surge protection;

s510: the distribution line led out from the distribution box to the roof electric equipment and the control button box passes through a steel pipe or a steel hot galvanizing cable groove box; one end of the steel pipe and one end of the groove box are connected with the distribution box and the PE wire, and the other end of the steel pipe and the groove box are connected with the shell of electric equipment and the protective cover and are connected with the roof lightning protection device nearby; when the steel pipe is interrupted by the connection equipment, jumper connection is adopted.

In this embodiment, all the lead materials are grounded, and the grounding trunk line of the grounding device is used for conducting electricity, so that the electrification of metals such as a shell and a bracket caused by electric leakage or electrostatic induction can be effectively prevented, and the safety is further improved.

In addition, all install surge protector to block terminal, computer lab, block terminal, illumination trunk road etc. it can be when the electric current is great, adopts the form of reposition of redundant personnel to each part is electric to prevent that it from overflowing and burning out.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (10)

1. The construction process of the electrical installation engineering is characterized by comprising the following steps of:

s1: installing a pipe and threading in the pipe; installing the tubing on a hanger or a bracket or a wall, penetrating, fixing and connecting a lead;

s2: the installation distribution box is connected with the line; punching a box body of the distribution box, fixing the box body with a bracket or a wall, and connecting the connected line ends with components of the distribution box;

s3: installing a bridge and laying cables; leading out power illumination main lines of all low-voltage distribution chambers, erecting a bridge, and connecting the power illumination main lines by using cables;

s4: the vertical shaft device is electrically installed; setting up a longitudinal frame at a vertical shaft position, laying a longitudinal cable, leading out cables of a distribution room without a layer, communicating the cables with the longitudinal cable, and then connecting the cables with a grid;

s5: lightning protection is grounded; and (5) installing a grounding device for lightning protection.

2. An electrical installation engineering construction process according to claim 1 wherein the step S1 comprises the steps of:

s11: laying and connecting pipelines; fixing the steel pipes on a hanger, a bracket or a wall one by one according to a designed path, and welding and fixing adjacent steel pipes by using an elbow or a straight connector;

s12: connecting a pipeline box inlet and a box; connecting a pipeline box feeding box and a box to a pipeline by using a grounding clamp;

s13: welding a ground wire; installing a grounding clamp on the outer wall of the steel pipe, and connecting the grounding clamp to the ground by utilizing a welding steel bar mode;

s14: binding corners, head ends and tail ends of the pipelines to the hanging frame or the bracket by using iron wires, and equally-spaced-arrangement and fixation of straight-line positions;

s15: selecting a wire: selecting the specification and model of the Zecounty according to the design to be used as standby; the method comprises the steps of carrying out a first treatment on the surface of the

S16: a pipe sweeping; cleaning the pipeline, impurities in the box and the box, cleaning impurities or rust adhered on the surface by using a steel brush, and then blowing out by using an air gun;

s17: threading; penetrating the lead into the pipe by using a threading device, and reserving the lead at the pipe orifice, the pipeline box and the box as wiring allowance;

s18: wiring; connecting the wires according to a circuit diagram, and installing electric components;

s19: detecting insulation; and the connected circuit is subjected to insulation detection by using a megohmmeter, and the insulation resistance is more than 1.0 megaohm.

3. The electrical installation construction process according to claim 2, wherein in S11, when the length of the dark piping is greater than L, a junction box is provided in the middle of the length of the dark piping, wherein L is a limit length which is associated with the number of turns of the dark piping; the transverse arrangement direction and the longitudinal arrangement direction of the exposed piping are respectively parallel and perpendicular to the ground, and the elbow is fixed on the hanging bracket or the wall by using a pipe clamp.

4. The construction process of electrical installation engineering according to claim 2, wherein in the step S12, when the pipeline enters the box and the box, the pipe orifice is 3-5 mm higher than the inner wall of the box and the box, and the distance between the pipe orifice connected with the equipment and the ground is greater than 200mm.

5. The electrical installation engineering construction process according to claim 2, wherein in the step S13, the welding length is greater than 6-8 times of the diameter of the steel pipe, and the welding surface is greater than 3.

6. The electrical installation engineering construction process according to claim 2, wherein in the step S18, when the wire is connected to the electrical component, the wire having a cross section of 10mm2 or less is directly connected to the terminal of the electrical component; the wire with the section of less than 2.5mm2 is compacted by using tin coating and then is connected with a terminal of an electric component.

7. The electrical installation engineering construction process according to claim 1, wherein the step S3 comprises the steps of:

s31: installing an angle steel bracket and a suspender, punching holes along the wall in the power distribution vertical shaft, and fixing the angle steel bracket by using expansion bolts or embedded bolts; then installing a hanging rod at the bottom of the steel frame;

s32: installing a bridge connecting plate; the bridge connecting plate is mounted on the angle steel bracket by bolts, and nuts are arranged on the outer side and screwed up;

s33: installing a grounding trunk line, and laying galvanized flat steel along the arrangement path of the angle steel bracket to serve as the grounding trunk line; the grounding trunk line is electrically connected with the angle steel bracket by using steel bars or wires;

s34: installing a wire slot; fixing the wire slot at the bottom of the suspender; a hanging bracket or a support is arranged at a specific position of the metal wire slot;

s35: bridge cleaning and cable detection; cleaning sundries and burrs in the pipe of the bridge; checking the insulation resistance of the cable;

s36: and laying cables one by one according to paths of the bridge frame and the wire slots, and fixing the cables by using fixing cards.

8. The electrical installation construction process according to claim 7, wherein in S34, the specific position of the metal wire slot includes a straight line segment not greater than 3m or a wire slot joint, a wire slot head end, a terminal end, and a corner of the wire slot at 0.50m and a junction box.

9. The electrical installation engineering construction process according to claim 1, wherein in S4, the longitudinal frame comprises a bracket for plugging a bus bar, a bracket for a cable bridge, a bracket for a cable, and a bracket for a box; which comprises the following steps:

s41: installing a plugging bus duct, a cable bridge and an exposed line pipe;

s42: laying a longitudinal cable and an electric wire;

s43: installing an electric box body and a plug-in bus plug-in box body;

s44: installing an electric vertical shaft and grounding dry wiring and branch lines;

s45: installing an electric lighting lamp and an overhaul socket in the electric vertical shaft;

s46: and closing the shaft hole, detecting electrical equipment and performing test operation.

10. The electrical installation engineering construction process according to claim 1, wherein in S5, the common ground electrode is used for the neutral point of the transformer, the protection ground of the electrical equipment, the ground of the elevator machine room, the fire control room, the telephone machine room, the computer room, etc., and the ground resistance is less than 1.0 ohm; which comprises the following steps:

s51: a hot dip galvanized flat steel is laid on a bridge frame from the power transformation and distribution room to the strong electric shaft, and the power transformation and distribution room is grounded and connected with the strong electric shaft;

s52: connecting the cable bridge, the bus duct shell and the bracket thereof with a grounding trunk;

s53: the non-hot galvanizing bridge is connected in a bridging manner to ensure the grounding electrical connection;

s54: respectively spreading hot dip galvanized flat steel in strong and weak current shafts in a through manner, wherein each three layers of flat steel are connected with the steel bars of the floor in an equipotential manner and are connected with equipotential grounding boxes arranged in each layer of strong and weak current room;

s55: PE terminal blocks and bridge frames of all distribution boxes in the strong current vertical shaft are reliably connected with wiring copper bars in the equipotential junction boxes by BV-1X10mm < 2 >;

s56: connecting a neutral line of the output end of the uninterruptible power supply with a grounding main line directly led by a grounding device, and repeatedly grounding;

s57: the bottom ends and the top ends of the metal pipelines and the metal objects which are vertically laid are connected with the lightning protection device;

s58: the protection tube of various wires/cables led out of the building, the metal sheath of the armored cable, the shell of the enclosed bus and the I-type lamp are reliably connected with the grounding wire;

s59: an I-level test surge protector is arranged on a low-voltage bus of a power transformation and distribution room, and a III-level test surge protector is arranged in a distribution box of a weak electric machine room; the roof outdoor fan and the outdoor lighting distribution box are internally provided with I-level test surge protection;

s510: the distribution line led out from the distribution box to the roof electric equipment and the control button box passes through a steel pipe or a steel hot galvanizing cable groove box; one end of the steel pipe and one end of the groove box are connected with the distribution box and the PE wire, and the other end of the steel pipe and the groove box are connected with the shell of electric equipment and the protective cover and are connected with the roof lightning protection device nearby; when the steel pipe is interrupted by the connection equipment, jumper connection is adopted.

Images