The principle and method of marking terminal blocks with alphanumeric symbols, where the two endpoints of a single component are represented by two consecutive numbers.

The middle terminals of a single component are represented by naturally increasing numbers. The same component group is prefixed with a letter before the number, such as the letters U1, V1, W1 used to identify three-phase AC systems.

If there is no need to distinguish between them, the numbers 1.1, 2.1, and 3.1 can be used to indicate them. A group of similar components.

Identification of electrical wiring terminals connected to specific wires. The clamping mechanism of the terminal block is a mechanism that generates pressure between the wire and the conductive strip. Only by generating sufficient pressure can low contact resistance be ensured and a good connection be formed. Therefore, the reliability of the clamping mechanism directly affects the quality of the wire connection.

For threaded terminals, screws, copper posts, and pressure plates are important components that make up the clamping mechanism; For non threaded terminals, springs or spring cards are important components of the clamping mechanism.

Non threaded terminals, the clamping mechanism is mainly spring, so the selection of spring material is crucial. It is necessary to ensure sufficient contact pressure and not excessively damage the wire. Spring terminals are currently the most reliable non threaded terminals.

When entering the wire, you can press the spring with a push block or screwdriver. After entering the wire, release the spring and use its rebound force to tightly press the wire, generating sufficient contact pressure. Then use the blade of the spring to pinch the wire to prevent it from loosening or being pulled out manually