Reading method of electrical construction drawings
(1)? Familiarize yourself with the electrical legend symbols, and figure out what the legend and symbols represent. Commonly used electrical engineering legend and text symbols can be seen in the state promulgated the "electrical graphic symbols standard".
(2)? For a set of electrical construction drawings, generally should be read in the following order, and then focus on a certain part of the content of the reading.
①? Look at the title bar and drawing catalog? Understand the project name, project content, design date and drawing content, quantity, etc..
②? Look at the design description? Understand the project overview, design basis, etc., to understand the drawings failed to express the relevant matters.
③? Look at the equipment and materials table? Understand the project used in the equipment, materials, models, specifications and quantities.
④? Look at the system diagram? Understand the basic composition of the system, the main electrical equipment, the connection between the components and their specifications, models, parameters, etc., to master the composition of the system overview.
5? Look at the layout plan? Such as lighting plan, lightning protection and grounding plan. Understand the specifications of the electrical equipment, model, number and the starting point of the line, laying parts, laying methods and the number of wires. Plan reading can be carried out in the following order: power inlet main distribution box trunk line branch line sub distribution box electrical equipment.
6? Look at the control schematic diagram? Understand the system of electrical equipment in the electrical automatic control principle to guide the equipment installation and commissioning work.
⑦? Look at the installation wiring diagram? Understand the arrangement and wiring of electrical equipment.
⑧? Look at the installation drawings? Understand the specific installation of electrical equipment, the specific size of the installation components.
(3)? Seize the points of the electrical construction drawings for reading
In reading the map, you should seize the points for reading, such as:
①? In a clear load level on the basis of understanding the source of power supply, the introduction of the way and the number of roads;
②? Understand how the power supply into the home is introduced by the outdoor low-voltage overhead or cable buried directly into the introduction;
③? Clearly the phase sequence of the distribution circuit, path, pipe laying parts, laying mode and wire type and number;
④? Clearly electrical equipment, device plane installation location.
(4)? Combined with civil construction drawings for reading
Electrical construction and civil construction is very close, construction often involves cooperation between the various types of work. Electrical construction plan only reflects the plane layout of the electrical equipment, combined with the reading of civil construction drawings can also understand the three-dimensional layout of electrical equipment.
(5)? Familiarize yourself with the construction sequence, easy to read electrical construction drawings.
Such as reading the power distribution system diagram, lighting and socket plan, you should first understand the construction sequence of indoor wiring.
①? According to the electrical construction drawings to determine the location of equipment installation, wire laying, laying path and wire through the wall or floor position;
②? Combined with the civil construction of a variety of embedded parts, conduits, junction boxes, protective tubes buried;
③? Installation of insulated supports, wire clips, etc., laying wires;
④? Installation of lamps, switches, sockets and electrical equipment;
⑤? Conduct conductor insulation test, inspection and energization test;
⑥? Acceptance of work.
(6)? Reading, construction drawings in the drawings should be coordinated with the reading
For specific projects, in order to illustrate the relationship between power distribution need to have a distribution system diagram; to illustrate the specific installation of electrical equipment, devices need to have a layout plan; to illustrate the principle of operation of the equipment need to have a control schematic diagram; for the connection relationship between the components need to be mounted wiring diagrams; in order to illustrate the characteristics of the equipment, materials, parameters, etc. need to have the equipment and material table. When you need to have equipment and materials table. These drawings have different purposes, but they are linked and coordinated. In reading should be based on the need to read the combination of drawings to read, in order to achieve a comprehensive understanding of the entire project or division of the project purpose.
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