Is a collection of research and development, design, production, sales
Professional cable tray and busway company
Baotou Pangtian Electrical Equipment Co., Ltd.
Service Hotline: 0472-6868842
Contact: 13722076608 (Manager Zhang)
18018652606 (Manager Wu)
Address: No. 18-19, Building 5, Northwest District, Haode, Donghe District
Selection of cable bridge fire rating
The cable bridge is in the section with fire protection requirements. The cable ladder frame and tray can be added with fire-resistant or flame-resistant plates, nets and other materials to form a closed or semi-closed structure. The overall fire resistance performance of measures such as applying fire-resistant coating should meet the requirements of relevant national codes or standards. In places with high fire protection requirements, it is not suitable to use aluminum alloy cable trays.
Under the same specifications, flame-retardant cable trays are 2.2 times more expensive than steel cable trays, their service life is more than 5 times that of steel cable trays, and their weight is 30% heavier than steel cable trays. Fire-resistant cable tray is slightly more expensive than steel cable tray, its service life is more than 3 times that of steel cable tray, and its weight is basically the same as steel cable tray.
Selection of filling rate of cable tray
The selection of the width and height of the cable ladder frame and tray should meet the requirements of the filling rate. In general, the filling rate of the cable ladder frame and the tray can be 40% -50% for power cables and 50% -70% for control cables. And 10% to 25% of the project development margin should be reserved.
Selection of load level of cable tray
When selecting the load level of the cable bridge, the working uniform load of the cable bridge should not be greater than the rated uniform load of the selected load level of the cable bridge. If the actual span of the support and hanger of the cable bridge is not equal to 2m, the work should be uniform. The cloth load shall meet the requirements. Under the conditions of corresponding loads, the specifications and dimensions of various components and hangers should match the straight sections of the pallets, ladder frames, and bent series.
Selection of specifications of cable tray
In engineering practice, the problem in selecting the size of the cable tray is either too large or too tight. How to choose a reasonable size of cable tray? Articles 8, 10, and 7 of the Code for Electrical Design for Civil Buildings (JGJ16-2008) stipulate: "The ratio of the total cross-sectional area of the cable to the cross-sectional area inside the tray, the power cable should not be greater than 40%; the control cable should not be greater than 50%. "
Select cable tray according to cable bending radius
When selecting the bent-through or lead-in and lead-out device of Baotou cable tray , it should not be less than the minimum allowable bending radius of the cable in the cable tray.