The wire trough, also known as the row wire trough, or the bridge, is an electrical appliance used to regulate the arrangement of wires such as power cords and data cables, and fix them on the ceiling or wall. The main types of metal trunking are: galvanized trunking, stainless steel trunking, stepped trunking, aluminum alloy trunking, etc.

The four-level line pipe is also called the British standard line pipe and the BS standard line pipe. When connecting, special sleeves should be used for connection. Note that the connection should be in the center of the connecting sleeve, the two connecting pipes should be close to the center of the sleeve, and the joint should be firmly fixed.

The Level 3 line pipe is also called JDG line pipe, national standard line pipe and iron line pipe. It adopts galvanized steel pipe and thin-walled steel pipe for jumper grounding, which overcomes the shortcomings of complicated construction and large loss of ordinary metal conduits, and also solves the problems of poor fire resistance and difficult grounding of PVC pipes. The best choice for dedicated protection lines.