Cable Tray
XQJ series is suitable for power cables with voltage below 10 kV, as well as control cables, lighting wiring, etc., for indoor and outdoor overhead cable trenches and tunnels.
(2) Structural Characteristics and Installation
The XQJ series has the characteristics of complete varieties, wide application, high strength, low cost, simple construction, flexible wiring, standard installation, and beautiful appearance, which brings convenience to your technical improvement, cable expansion, and maintenance and repair.
The installation of XQJ series can be adapted to local conditions. It can be installed overhead along process pipelines; suspended from floor slabs and beams; side-mounted on indoor and outdoor walls, columns, tunnels, and cable trench walls; and can also be installed on outdoor columns or supports. When large multi-layer cable trays are hoisted or vertically installed, try to use I-beam columns with symmetrical laying on both sides.
XQJ series can be laid horizontally and vertically; can be turned, T-shaped, cross-shaped branches; can be adjusted in width and height.
(3) Layer Arrangement of Cables
1. In the layer arrangement, weak current control cables are on the topmost layer. Then general control cables, low-voltage power cables, and high-voltage power cables are arranged downward in sequence. (See the table below). This arrangement is conducive to shielding interference, cooling of power cables, and convenient construction.
2. The distance between layers is:
Control cables ≥200mm
Power cables ≥200mm
Mechanized laying cables ≥400mm
(4) Size Selection and Calculation
Calculation of total load G
G total = n1q1+n2q2+n3q3
Where: q1, q2, q3, …… are the weight per unit length of each cable (Kg/m)
n1, n2, n3, …… are the number of corresponding cables
G should be less than the allowable load of the cable tray
When outdoors or with protective covers, factors such as water load and wind load should also be considered.
4. Precautions
1. The maximum load of DQJ type devices, the support spacing should be less than the allowable load and support span.
2. When selecting the width, certain spare space should be reserved for future cable addition.
3. When there are few power cables and control cables, they can be installed in one tray, but a partition should be used to separate power cables and control cables.
4. When laying cable tray horizontally, the connectors between trays should be set as much as possible at about 1/4 of the span. Horizontally routed cables should be fixed every 2 meters or so, and vertically routed cables should be fixed every 1.5 meters or so.
5. The device should have reliable grounding. If the cable tray is used as the grounding conductor, the ends of each layer of the tray should be connected (in parallel) with 16mm2 soft copper wire to the main grounding conductor. For long distances, grounding should be done every 30-50 meters.
6. In addition to the shielding protective cover, when installed outdoors, a protective cover should be added on the top layer to prevent sun and rain.
If welding installation is required, the weld thickness around the weldment should not be less than the thickness of the base material, and the weld must be anti-corrosion treated.
