Composition of wiring terminals
The composition of the terminal and the role of the terminal is a low-voltage cable, wire access to electrical equipment (usually transformers, boxes, cabinets, etc.) when the connection of the gold. Terminal is to facilitate the connection of the wire and the application, it is actually a piece of metal sealed inside the insulating plastic, both ends have holes can be inserted into the wire, there are screws for fastening or loosening, such as two wires sometimes need to connect, and sometimes need to disconnect, then you can use the terminal to connect them, and can be disconnected at any time, without having to weld them together or winding together, very Convenient and fast. And suitable for a large number of wire interconnection, in the power industry there are special terminal blocks, terminal boxes, the top is full of terminal blocks, single-layer, double, current, voltage, ordinary, breakable, etc.. A certain crimping area is to ensure reliable contact, as well as to ensure that sufficient current can be passed. Terminal is used to achieve electrical connection of an accessory product industry is divided into the category of connectors. With the increasing degree of industrial automation and industrial control requirements more and more strict and precise, the amount of terminal blocks gradually rise. With the development of the electronics industry, the use of terminal blocks more and more scope, and more and more types. Currently the most widely used in addition to PCB board terminals, there are hardware terminals, nut terminals, spring terminals and so on. Terminal is actually a connector, is to facilitate the connection of the wire and the application, it is actually a section of the metal sealed in the insulating plastic inside the piece, both ends have holes can be inserted into the wire, there are screws for fastening or loosening, such as two wires, sometimes need to connect, and sometimes need to disconnect, then you can use the terminal to connect them, and can be disconnected at any time, without having to weld them They can be connected with terminals and can be disconnected at any time without having to solder them or wind them together, which is convenient and fast.
1, The use of the junction box grounding terminal block
A: grounding terminal is a special ground terminal, now our country’s electricity is a three-phase four-wire system. The zero wire and ground wire are separated. Ground wire is generally connected to the ground in the socket to protect the safety of electricity!
2, What is the case of using terminal blocks?
Answer: different equipment between the wire connection, the need for terminal blocks, some plug-ins (modules) also need terminal blocks.
3, The electrical cabinet when the need for terminal blocks?
A: to an installation unit as a boundary, in and out of this unit will need to line terminal block.
4, Terminal block model 4EN in the model represents what does it mean?
A: 4EN means the contact area of 4 square millimeters.
5, what is the role of the terminal block?
A: convenient wiring; such as in the installation of power distribution cabinets, cabinet doors on the signal lights or meters are to be on the terminals. Easy to check the line; convenient to measure when a fault occurs. Node expansion; the same line number node expansion.
6, in the substation design, how to choose the transformer and terminal block?
A: The capacity of the transformer to be calculated, too large or too small are not: terminal block to ground distance is generally not less than 350mm, the current circuit must use OT wiring current test terminals.