【 Weak current College 】 intelligent construction electrical construction drawing design depth discussion

Summary: this article is based not on construction drawing design depth requirements, based on practical experience and national new standards and specifications, some electrical design depth of practice and theory of in-depth discussions. In its basis, gives the General intelligent construction electrical construction drawing design format and design depth specific requirements.
Keywords: design specification design depth of intelligent building
In order to adapt to the information society and intelligent building boom and thrown to design specifications and design changes, this author from enhanced technical management, satisfy the requirements and improve the site construction engineering drawings design quality, etc., for electrical construction drawing design format and to discuss the design depth.
In recent years, with the appearing of intelligent building weak electricity system, lightning protection measures has attracted widespread attention from people in the industry. China Research Institute of building standard design on the National Atlas of the buildings, structures, installation of lightning protection facilities (D562) and the independent lightning rod (D565) Atlas of revision, from December 1999 to 2 may begin the introduction of the new National Atlas of the building mine facilities installation (99D562), the Atlas of the original standard, highlighted the weak part of overvoltage protection (information systems and electronic devices, electrical equipment). Because the connection to the workstation, server, and the cable between the client computer is long, the effect of impulse voltage is becoming a data loss or system failure. In addition, the characteristics of the Internet allows access to a certain point surge can spread along the network and destroy the other workstations, network equipment damaged probability increased significantly. Visible light current overvoltage protection in electrical construction drawing design, has a special significance.
The Atlas (99D562) lightning and overvoltage protection is divided into three parts: an external lightning protection, internal lightning protection and over-voltage protection. Which
⑴, external lightning protection including: jieshan Qi (needle, network, tape), down lead, earthing, shield.
⑵, internal lightning protection including: masks isolation, equipotential bonding, safe distance.
⑶, overvoltage protection means lightning electromagnetic pulse (external power surge protection) and internal operating voltage (internal surge protection near). In General, reasonable shielded and grounded surge through voltage reduction on physical and equipment failure of fundamental premise and means to ensure that electronic equipment from surges overvoltage damage, according to the actual situation in the power system, antenna-feeder system, signal systems and grounding systems, four aspects of specific design, adding multilevel surge overvoltage protection device (SPD SPD is restricted transient over-voltage minutes walk surge current of components). National standards for the building mine facilities installation — 99D562 on SPD (SurgeProtectivedevice) selection made specific recommendations. Intelligent building has many important electronic equipment installed in a building, it should be in the power and the electronic equipment supply Department depending on the device's ability to withstand the pressure the installation of a multi-stage SPD., second class mine building power of the first level of protection should in General into the line of distribution cabinet with SPD "level." Its flux In design requirements: In ≥ 40 ~ 80kA. the second level of protection in the UPS or distribution Cabinet before adding "SPD" II. Its flux In design requirements: In ≥ 40kA third, fourth-grade power protection in important equipment distribution system or work before adding the three-level SPD "its flux In design requirements: In = 5kA. Furthermore, as the information society development, residential smart design (weak design) the importance and the role of residential design, its technical complexity and difficulty. Therefore, the tenth of residential design standards to this part of the content solely for the chapter. Therefore, in domestic intelligence construction drawing design, should take full account of the technological advancement, equipment standardization, the openness of the Internet, systems * and extendibility and other aspects. For example: from cabling, each residence to set "information wiring box", TV and communication (phone and data), security, and other information available through the "pipeline distribution box" when it is closed.
Household settings information distribution box, has the following benefits:
⑴, communication lines wiring easier, now we introduce each residential communications line has computer data communication network and the city telephone network, in order to make household uses the bedroom or living room information outlet convenient in computer data communication network and telephone network, select in home settings information wiring box so that users in the computer network and telephone network lines between very easily jumper connections.
⑵, CATV circuit wiring easier, each housing can only import one TV cable, information distribution box set branch (distribution), and then to the bedroom, living room with individual television Terminal.
⑶, future residential decoration, line changes etc.
According to the new standards and specifications and the author of practical experience, the following intelligent construction electrical construction drawing design format and design depth specific requirements.
1, design drawings, specifications and material table total
1.1, construction drawing design documents meet the initial requirements for the design and approval documents, file integrity, calculates the correct text, drawings and grammatically correct, depth and format comply with the requirements of the quality management system, to prepare project budgets, for the production of non-standard equipment for construction, installation and engineering acceptance.
1.2, drawing a new column before the directory generally draw drawing, selection criteria after columns or reuse drawings (standard drawing and installation diagram use accurately reasonable). The same system in the order we will follow the drawings trunk system diagrams, floor plans, sections and detail drawing, control schematics in order. For large or complex engineering drawings, can also be taken by the system is divided into volumes choreography.
1.3, drawing Home should always design total instructions, major equipment and material table. Different systems of material table should be separated by a blank line is appropriate to distinguish between; other drawings are ordered, we will follow high pressure to low pressure, front-end to the end, the strong electricity to power.
1.4, design should be in the general instruction on construction projects in the area, height, function and fireproof grade description of main data to facilitate reading and examination.
1.5, large or complex projects detailed description can also be listed on the main system diagram or on the first floor plan. Large or complex project lighting and fire protection materials tables can be included in each plan (but there is still a summary table of materials).
1.6, design basis, design basis material is complete, correct design file integrity; content and depth in line with the budget and the requirements of the site construction; writing good, clearly and explicitly, the same account to the project main font should remain consistent for the maintenance of the drawings shall, in coordination with the larger error; on numerous pipeline plant should have comprehensive pipeline.
1.7, major equipment and materials should be listed in the table the corresponding legend symbol, trunk system should also be listed in the legend symbol. Electrical equipment and installation accessories for installation height, in addition to drawings in the explanation, generally in the materials table mentioned in the attached bar. In order to facilitate reading and understanding of the drawings.
1.8, design basis, where a lack of design projects (such as substation, fire fighting, civil defense, construction intellectualization, the second decoration design determine lighting, multilayer and high-rise residential buildings in distribution, etc.) should make the necessary instructions. Particularly related to building security, information about delegate construction party record. archiving
1.9, design conditions and design account book is the foundation of the engineering design, project review, people should review carefully examined, signed, and should be regularly archived and as engineering design report excellent one.
1.10, professional mutual request, contact information for General shall, in writing, and on-time filing cuncha to ensure design integrity of data.
2. General layout construction drawing design requirements
2.1, power supply system (including special power), power systems, indoor and outdoor lighting, lightning protection and antistatic, grounding and other security measures, its electricity substation and distribution locations, equipment selection, equipment and wiring principles consistent with the initial design and approval documents, material choice, the relevant measures to meet the requirements for the production and use.
2.2, General layout, should draw the power supply into line and the laying of the way (from building to building axis current accommodation within), power distribution and substation is introduced in the manner and floors or elevation, necessary to be made to the local profile.
2.3, drawn inside a building where distribution or substation and distribution and demand for electricity substations and transformer installed capacity of the capacitor capacity.
2.4, communication systems, automatic control system, the signal system of the station building and equipment selection and line layout principles consistent with the initial design and approval documents, specific wiring and related measures reasonably * and can meet requirements of production and use.
2.5, draw the General Plan communication junction (box), and marked communication trunk introduced by man hole locations and the model specifications. Choose one hole shall be marked in the referenced standard the non-standard figure number, the description must be a detail drawing. On the scale, capacity building and communication and the composition is also required.
2.6, on cable television systems, should draw the line signal coaxial cables into the direction, location, and mark out the model specifications.
2.7, involving "building intelligent" system related systems engineering trends and buried pipelines, shall always drawn in the plane. (Intelligent systems engineering design there are detailed instructions below).
2.8, outdoor electrical lines and other professional pipeline appears tiled or staggered manner, such as complex should draw partial profiles give height, depth, spacing, and special protective measures.
2.9, for corrosion protection, explosion-proof, temperature, humidity and other special requirements in production environments (such as air cleanliness, defence of micro-vibration and electrostatic and electromagnetic compatibility, etc.) for ELV system, according to the preliminary design and approval documents, to take reasonable, but the overall layout, * and to meet the requirements for the production and use.