The distribution box is assembled according to the requirements of electrical wiring. The switchgear, measuring instrument, protective appliance and auxiliary equipment are assembled in a closed or semi-closed metal cabinet or on the screen to form a low-voltage power distribution device. The circuit can be switched on or off with a manual or automatic switch during normal operation. In the event of malfunction or abnormal operation, the circuit or alarm is cut off by means of a protective device. The measuring instrument can display various parameters during operation, and can also adjust some electrical parameters to prompt or signal the deviation from the normal working state. In the electrical installation process, we need to connect the wires to the equipment, control switches, distribution boxes, and so on. Due to the cross-sectional size of the wire, the small-section wire in actual work is usually a single-core wire, such as BV-3*2.5 (copper core plastic insulation, three single-core wires). When such wires are connected to the distribution box, The insulation of the wire end can be peeled off and can be crimped to the distribution box, that is to say, the terminal end of the wire does not need to be a terminal (also called a wire nose), which is called a terminalless external wiring on the budget. In addition, small-section wires also have multiple strands, such as flexible wires (BVR), which are composed of multiple strands of thin copper wire. When such a wire is connected to a device or a switch, a plurality of copper wires are usually gathered with a metal sleeve, and the metal sleeve is a terminal, commonly known as a wire nose. This is called a terminal external wiring on the budget. When the wire has a large cross section, the wire is generally multi-stranded. Terminals must be made, and the terminals are divided into copper (aluminum) terminals and copper (aluminum) terminals. The material of the terminal is the same as that of the wire, that is, the copper core wire is used as the copper terminal, and the aluminum core wire is used as the aluminum terminal. This is called a solder (voltage) terminal block on a budget. Based on the sub-headings of the current budget quota, we can draw the following conclusions: 1. For single-core conductors with a cross-sectional area of ​​less than 6 mm2, calculate the terminalless external wiring. When the thickness exceeds 6 mm2, the cross-section is considered to be large, and the welding (voltage) terminal is calculated. 2. If the cross section of the multi-core wire is within 6mm2, the external wiring of the terminal is calculated. When it exceeds 6mm2, it is considered as a large cross section, and the welding (voltage) terminal is calculated. 3. The material of the terminal must be the same as the material of the wire. 4. After the welding (pressure) terminal is calculated, the external wiring of the terminal must not be calculated. Indoor Led Display,Indoor Advertising Led Display Screen,Indoor Led Screen,Led Screen Indoor ShenZhen Megagem Tech Co.,Ltd , https://www.megleddisplay.com