With the continuous development of urbanization, the use of galvanized cable bridge can be seen everywhere, whether on the road or in the building. But what do you know about building cable trays? Today, let me explain to you how to select the cable tray inside the building? Hope to help you.
When installing cable trays in buildings, first pay attention to the protective grounding of cable trays, supports and hangers, incoming and outgoing metal cable conduits, and there shall be no less than 2 places. When the cable tray is allowed to form the grounding trunk circuit, the cable tray, supports and hangers and connecting plates shall be able to withstand the grounding fault current and meet the requirements of thermal effect. As the cable tray of the grounding trunk line, the connection resistance between its tray and the price increase end also has certain requirements.
When the grounding main line is laid separately along the whole line, the main line can adopt flat steel, and the indoor laying area shall not be less than 60 square meters. When introducing and leading out buildings, the bridge shall be connected with the indoor grounding trunk line or outdoor grounding device of the building. If aluminum alloy bridge is used, it shall be noted that bare copper cannot be used as the grounding main line on the bridge to prevent electrochemical corrosion.
Do you know how to choose the cable tray inside the building? Let's take a look at trough cable tray, energy-saving perforated tray and combined cable tray.
Grooved cable tray is a common tray. It is also called covered non perforated tray. It is a fully enclosed metal shell, which can inhibit external electromagnetic interference and protect against external harmful liquid and dust erosion. If your service environment has relevant requirements, you might as well try this tray type.
Energy saving perforated tray (i.e. tray cable tray) and stepped cable tray are mostly used in general. These two types of trays have good ventilation and heat dissipation and can achieve power saving effect. In addition, these two types of trays can also be used for control cables without shielding requirements.
Combined cable tray, also known as assembly tray and combined tray, can be used in places with many cables, heavy load, large section and fixed space conditions. Generally, the assembly tray is single-layer, which is more convenient for wiring and maintenance. Many large-scale distribution control underground technology mezzanine also use this kind of bridge.