The power cable and low-voltage instrument signal cable are laid in the same cable bridge at the same time to play a separation role. For example, if the 300 * 150 cable tray needs to be provided with a partition, its representation method is generally (200+100) * 150, that is, the 300 mm wide cable tray is divided into two areas of 200 mm wide and 100 mm wide.
Fire-fighting circuit, common circuit and 2-way cables with the same load shall be laid separately, and clapboard shall be added when laying in the same bridge. The fire line has fire protection requirements, and sometimes it must be laid in the fire resistant tank box. If common cables and fire cables are laid in the same tray, the investment of common distribution circuit cables will be increased because the current carrying capacity is reduced a lot (0.38 at least). Therefore, it is more reasonable for common cables to be laid separately in the cable body frame. If mineral-insulated cables are used for fire protection, both fire protection and non-fire protection can be laid in the ladder, there is no such problem, and only a partition is required.
As shown below:
According to different requirements, there are generally two types of diaphragm, and their installation methods are also different:
1. Fix the partition, that is, weld the partition in the tray groove according to the position or size required by the customer. Disadvantages: poor flexibility. In case of design change during construction, it cannot be changed. Advantages: the construction party saves time and labor; 2. Movable partition:
2. Separately process the baffle plate, machine the bolt hole at the bottom of the baffle plate, and connect it with the tray trough with bolts. Disadvantages: time-consuming and labor-intensive. During construction, screw holes shall be processed at the required positions of the tank body. Advantages: high flexibility, design can be changed at any time according to requirements.
Before using the partition, first determine the specification and model of the bridge according to the number, diameter and spacing distance of the cables required, and pay attention to:
1. When selecting the width of cable tray, a certain amount of spare space shall be reserved for the future addition of cables and partitions.
2. When there are few power cables and control cables, they can be installed on the same cable bridge, but the power cables and control cables should be separated and laid by partitions..
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