Do you know why the cables in the cable tray cannot be filled? In fact, it is mainly because of the heat dissipation problem. In order to let everyone better understand the problem, the following Jinan cable tray manufacturer will analyze it for you.
It is mainly a heat dissipation problem. The denser the cable cloth is, the more heat is generated and the smaller the cable current carrying capacity is. It is possible that the electrical load current exceeds the actual cable current carrying capacity and does not reach the overload long delay current of the circuit breaker. At this time, the cable will be burnt out and the circuit breaker will not act before burning out.
Therefore, for safety reasons, it is generally stipulated in national regulations that the cross-sectional area of cables in the cable tray shall not exceed 40% of the cross-sectional area of the cable tray. However, in practice, it is recommended not to overlap the cables. Because the current carrying capacity of the overlapping arrangement decreases rapidly, our company has always considered the size of the cable tray according to the fact that cables can only be laid in a single layer in the bridge frame, without cable overlap.
In addition, we also need to know more about the relevant cable tray routing principles, such as:
When cable tray wiring is adopted indoors, its cable shall not have outer sheath of jute or other flammable materials.
When cable tray wiring is used in places with corrosion or especially damp, corresponding protective measures shall be taken according to different corrosive media, and plastic sheathed cables shall be selected.
The cable can be laid on the cable tray without spacing. The filling rate of the cross section of the cable in the cable tray: the power cable shall not be greater than 40%; The control cable shall not be greater than 50%.
The cable tray should not be installed above the corrosive gas pipeline, thermal pipeline and below the corrosive liquid pipeline, otherwise anti-corrosion and thermal insulation measures should be taken.
The manufacturer has analyzed the problem of "why the cables in the cable tray cannot be full", and you can use it as a reference. If you have problems or need, you can contact us at any time http://www.yeeones.com ！