When representing cable trays on drawings, specific codes are usually used to identify different types of cable trays. For example, the code for trough-type cable trays is C, the code for ladder-type cable trays is T, the code for tray-type cable trays is P, the code for combined cable trays is ZH, and the code for long-span cable trays is DJ. In addition, if the cable tray is made of steel, it will be marked as G; if it is made of aluminum, it will be marked as L.
Cable trays are composed of brackets, brackets, and installation accessories, and are divided into trough-type, tray-type, ladder-type, grid-type and other structures. On the drawings, these components are also represented by corresponding graphics and symbols. In order to accurately understand the representation of cable trays on the drawings, it is very important to be familiar with the legend symbols in the electrical drawing instructions.