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Cooling methods for compact busbar trunking systems

If the temperature of a busbar trunking system becomes too high, common failures may occur. For safety, it is essential to take measures to keep the busbar trunking temperature within safe limits, thereby preventing overheating that could damage the system.

1. Low-voltage coaxial cables, power cables, branch‑type busbars, bare conductive rods, and piercing‑type cables, among others. Since heat generation varies with the type of product, the thermal capacity per unit area of the conductor differs accordingly. For the same product and the same wire specification, if the same current flows, the temperature rise and heat dissipation characteristics will change. The temperature increase depends on the cross-sectional area: as temperature rises, electrical resistance increases, operating pressure rises, and energy losses grow.

2. The compressive strength of busbars is consistent across all types. Therefore, the claim that a busbar with higher electrical conductivity has a lower current-carrying capacity per unit cross-sectional area is incorrect. Although overall design and heat dissipation have been addressed, factors such as differing characteristic impedance and magnetic induction significantly influence the current‑carrying capacity. Consequently, the national industry standard GB 7251‑2006 stipulates that, under the specified operating current, the temperature rise must be limited to a prescribed value at the rated voltage, thereby enhancing the performance of the busbar system.

3. When installing busbar trunking systems, on-site precise measurements must be carried out, with extremely stringent tolerances for width. Furthermore, the height and width of the junction boxes on the busbar trunking system must be determined in accordance with the design specifications. For concealed installations of fire‑resistant wiring, installation within unburned structural elements is not permitted, and the concrete cover over reinforcement must be at least 30 mm. In exposed installations, fire‑retardant coatings shall be applied to metal conduits or cable trays, as these materials themselves do not possess inherent fire‑resistance. When using insulated cables or cable sleeves made of non‑combustible materials, metal conduit may be omitted inside shafts provided the cables are adequately protected; however, where the route crosses floor slabs, conduit or cable trays must be used, and the joints on both sides must be sealed tightly.

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