Marking Of Terminal Electrical Equipment And Specific Conductors

Mark is a mark indicating the characteristics, which is widely used in electrical circuit diagram. Marks are generally more eye-catching, simple, easy to identify, better than text instructions, so it is widely used. In the electrical circuit diagram, in order to easily identify the relative installation position between wiring, wiring, wiring and various electrical components and equipment, as well as the connection relationship between them, it is necessary to make unified provisions on the connection marks of various wires, the color of wires and the marks of terminal blocks, so as to facilitate equipment maintenance, timely troubleshooting, and ensure the safety of personnel and equipment.

1、 Mark code Terminal marking refers to the marking of conductive parts used to connect devices and external conductors. It is mainly used for terminal marking of basic components (such as fuses, relays, transformers and rotating motors) and equipment composed of these devices (such as motor control equipment). It is also applicable to the identification of specific wire terminals (such as power supply grounding and enclosure grounding) that perform certain functions. The marking and identification methods of common electrical terminal blocks and specific wires in electrical circuit diagram are as follows. 1. There are special mechanical methods for marking the electrical terminal blocks of AC system: 1-Phase marking symbol is u; 2-phase marking symbol is V; 3-phase marking symbol is w; neutral wire marking symbol is n.

2. Power supply of AC system the specific wire marking method of AC system power supply is as follows: 1-Phase marking symbol is "L1", some drawings are indicated by "a"; 2-phase-marking symbol is "L2", some drawings are indicated by "B"; 3-phase-marking symbol is "L3", some drawings are indicated by "C"; The neutral line marking symbol is "n

3. The power supply of DC system. The specific wire marking method of DC system power supply is as follows: the positive pole marking symbol is" L. -, some drawings are indicated by "+"; the negative pole marking symbol is "L -" and some drawings are marked with "one"; the middle line marking symbol is "m",

4. The common mark of the terminal and specific conductor of the electrical appliance which protects the grounding wire is usually represented by the "PE" mark symbol. The graphical symbols are shown in Fig. 5-la.

5. The common mark of the terminal and specific conductor of the electrical appliance with ground wire is usually represented by "e" mark symbol, and its graphic symbol is shown in Fig. 5-ii.

6. Noise free grounding wire the common mark of the terminal block and the specific conductor of the electrical apparatus without noise grounding wire is usually represented by - JE "symbol, and its graphic symbol is shown in Fig. 5-ic.

7. The common mark of the special f line of the connection terminal of the electrical appliance connected to the machine shell or frame is usually represented by "mm" mark symbol, and its graphic symbol is shown in Fig. 5-id.

8. For equipotential and equipotential electrical appliances, the common mark of its terminal block and specific different line is usually represented by ". CC" marker, and its graphic symbol is shown in Fig. 5-le.

9. Ungrounded protective conductor, ungrounded protective conductor, the mark of specific conductor is indicated by symbol.. pull.

10. The protective earth wire and neutral wire are used together, and the protective grounding wire and neutral wire share the mark of line specific conductor, which is usually represented by the "EN" marking symbol.