The model composition and sequence of wires and cables are as follows: [1: category and use ][2: conductor ][3: insulation ][4: inner sheath ][5: structural features ][6: outer sheath or derivative ]-[7: use features]
Items 1-5 and 7 are represented by pinyin letters, and polymer materials are represented by English initials, and each item can be 1-2 letters; Item 6 is the number of 1-3.
Extended data:
Main components of electrical diagram
1, circuit
The structure of the circuit and the tasks it can accomplish are varied. Generally speaking, there are two purposes to form a circuit: one is to transmit, distribute and convert electric energy; The second is to transmit and process information. This paper mainly discusses the first circuit.
The circuit for transmitting, distributing and converting electric energy is usually divided into two parts: the main circuit and the auxiliary circuit. The main circuit, also known as the primary circuit, is a circuit that the power supply transmits electric energy to the load, generally including generators, transformers, switches, contactors, fuses and loads. Auxiliary circuit, also called secondary circuit, is a circuit that controls, protects, monitors and indicates the main circuit.
Generally including relays, meters, indicator lights, control switches, etc. Usually, the main circuit passes a larger current with a larger wire diameter, while the auxiliary circuit passes a smaller current with a smaller wire diameter.
The circuit is the main component of the electrical diagram. Because of the complex shape and structure of electrical components, graphic symbols and text symbols stipulated by the state are used to represent electrical components of different types, specifications and installation methods. In addition, according to the different uses of the electrical diagram, different forms should be drawn. Some only draw circuit diagrams to understand the working process and characteristics of the circuit.
Some only draw assembly drawings, so as to understand the installation position and wiring mode of each electrical component. For more complex circuits, it is usually necessary to draw the installation wiring diagram. When necessary, it is necessary to draw a separate wiring diagram (commonly known as an expanded wiring diagram) and a plan diagram for production departments and users.
2. Technical description
Text descriptions and component lists in electrical drawings are always called technical descriptions. Text description indicates some key points and installation requirements of the circuit, which is generally written on the upper right of the circuit diagram. If there are many explanations, they are usually explained with attached pages. Component list is used to list the names, symbols, specifications and quantities of components in the circuit. The component list is written above the title bar in the form of a table, and the serial numbers in the table are arranged from bottom to top.
3. Title bar
The title bar is in the lower right corner of the circuit diagram, which indicates the project name, drawing name and drawing number, as well as the signatures and dates of designers, drafters, auditors and approvers. The title bar is an important technical document of the circuit diagram, and the signer in the column should be responsible for the technical content in the diagram.
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