The wiring device is applied to facilitate the connection of wires, it is actually a piece of metal sealed in insulating plastic, there are holes at both ends to insert wires, and there are screws for fastening or loosening, such as two wires, sometimes they need to be connected, sometimes they need to be disconnected, then they can be connected with the terminals, and they can be disconnected at any time without soldering or entanglement, which is very convenient and fast. And it is suitable for a large number of wire interconnection, in the power industry there are special terminal strips, junction boxes, all of which are terminals, single-layer, double-layer, current, voltage, ordinary, fragile, etc. A certain crimping area is required to ensure reliable contact and to ensure that sufficient current can be passed.