The types of trunking line include slotted trunking, round hole trunking and separated trunking. The commonly used trunking in China is T-type trunking (PXC3 type). The trunking is extruded from PVC material, and its normal operating temperature is (- 5~+40) ℃. It is mainly suitable for wiring in electrical equipment with 50Hz (or 60Hz) voltage of 1200V, and it is used for mechanical protection and strengthening electrical protection of the conductors laid in it. Installation method of line trunking. It is directly installed on the base plate or on the metal bracket with the help of the fixing parts. The length (L) of trunking is generally 500mm, 600mm, 800mm, 1000mm, 1200mm, 1600mm and 2000mm, which can also be supplied according to the length required by users [1].