Marks are signs that indicate characteristics, and are widely used in electrical and electrical wiring diagrams. Marks are generally more eye-catching, simple, and easy to identify, and are more effective than text descriptions, so they are widely used.

In the electrical circuit diagram, in order to easily identify the relative installation positions of the wiring, wiring, wiring and various electrical components and equipment, as well as the connection relationship between them, it is necessary to mark the connection of various wires and the color of the wires Uniform regulations are made for the markings of terminals and wiring terminals to facilitate equipment maintenance, eliminate faults in time, and ensure the safety of personnel and equipment.

1. Marking code

The marking of the terminal refers to the marking of the conductive parts used to connect the device and the external conductor. It is mainly used for basic parts (such as fuses, relays, transformers, and rotating electrical machines) and equipment composed of these devices (such as motor control equipment). Terminal markings are also suitable for the identification of specific wire ends that perform certain functions (such as power grounding and chassis grounding, etc.).

The identification methods of commonly used electrical wiring terminals and specific wires in electrical wiring diagrams are as follows.

1. The marking of the electrical wiring terminals of the AC system of the AC system has a special mechanical method:

1 phase-the mark symbol is U;

2-phase-the mark symbol is V;

3-phase-Marker number one is W;

Neutral line-the mark symbol is N.

2. The specific wire marking method of the AC system power supply is as follows:

Phase 1—The marking symbol is "L1", and it is indicated by "A" on some drawings;

Phase 2—The marking symbol is "L2", which is indicated by "B" on some drawings;

3-phase-the marking symbol is "L3", and some drawings are indicated by "C";

Neutral line-the mark symbol is "N

3. DC system power supplyThe specific wire marking method of DC system power supply is as follows:

Positive electrode-the mark symbol is "L.-", and some drawings are indicated by "+";

Negative electrode-the mark symbol is "L-", and some drawings are represented by "一";

The middle line-the mark symbol is "M",

4. Protective grounding wire For electrical appliances that protect the grounding wire, the common mark of the terminal and the specific wire is usually represented by the "PE" mark symbol.

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