Trough-type cable trays derive their name from their resemblance to a rectangular trough or box; their counterpart is the ladder-type cable tray. For galvanized trough-type cable trays, the price is 19.7 RMB/meter for the 100×50×1.0 specification, 25.2 RMB/meter for the 100×100×1.0 specification, and 39.9 RMB/meter for the 200×100×1.2 specification. Structural types include trough-type (solid-bottom trays), tray-type (perforated trays), and ladder-type (ladder racks), while product varieties include straight sections, horizontal elbows, horizontal tees, vertical risers (upward/downward), and horizontal crosses. The following information has been compiled from online sources.
1. Trough-type Cable Trays
For straight trough-type cable tray sections with a length of ≤2000 mm, the permissible length deviation is ±2 mm. For sections longer than 2000 mm, the permissible deviation is ±4 mm. In some cases, the four outlets of a trough-type cross-piece may differ in size; consequently, electrical engineers must prepare a detailed procurement list based on design drawings to ensure manufacturers can promptly supply the correct products to the client.
The naming convention for trough-type cable trays typically follows the format: Material + Type + Specification (e.g., Fire-resistant trough-type horizontal elbow 200×100; Powder-coated trough-type horizontal tee 100×50; Stainless steel ladder-type horizontal cross 300×100). Additional supports or hangers should be installed at the ends of horizontal trough-type tray runs, at corners where trays enter or exit junction boxes, at turns, at both sides of expansion joints, and at the connection points of horizontal tees and crosses.
2. Cable Tray Prices
Prices for trough-type cable trays vary based on surface treatment; for instance, for a specification of 150×100×1.0 mm, the price is 30.0 CNY/m for galvanized trays, 45.9 CNY/m for fire-resistant trays, and 58.6 CNY/m for powder-coated trays. Similarly, for a specification of 400×200×1.5 mm, the price is 91.9 CNY/m for galvanized trays, 128.7 CNY/m for fire-resistant trays, and 158.1 CNY/m for powder-coated trays.
3. Cable Tray Structure
Universal hangers for trough-type cable trays are typically used with steel structures, such as I-beams, angle steel, and light-gauge steel framing. When assembling straight sections of trough-type cable trays, the main line should be installed before the branch lines. During installation, welding supports or hangers directly onto the building's primary steel structure is prohibited without authorization from a structural specialist; installed supports and hangers must be vertical and free from significant distortion.
4. Cable Tray Types
According to the JB/T 10216-2013 standard, the type code for a horizontal tee is 03A, for a vertical upward tee is 03B, and for a vertical downward tee is 03C. Under the same standard, the type code for a horizontal cross is 04A, for a vertical cross is 04B, and for a vertical upward elbow is 05A.
