Traditionally, externally purchased fire protection. Waterproof busbar trunking A dense-type busbar trunking system with waterproof features is employed, encased in rock wool or high-temperature-resistant mineral materials, and then fitted with fire-rated panels to achieve fire protection. When sufficient space is available, by thickening the external insulation layer, the fire-resistant and flame-retardant performance of this waterproof busbar trunking system can be enhanced indefinitely. For example, depending on the type of external insulation material used, the fire-resistance duration of the waterproof busbar trunking system can be extended from 2 hours to 4 hours. The fire-resistance parameters can be further increased to meet stringent fire-performance standards. This type of fire-resistant and waterproof busbar trunking system is widely used in workshops.

The downside is:

Since the insulation materials are purchased externally, the heat generated by the internal operating units during power-on cannot be dissipated. When a fire-rated and waterproof busbar trunking system is energized for an extended period, its inability to cool down can damage the inter-phase insulation materials, causing the trunking system to malfunction or even leading to accidents. Therefore, it cannot be used simultaneously under normal operating conditions. To alleviate the heat dissipation issue, certain densely packed fire-rated and waterproof busbar trunking systems are equipped—at regular intervals—with a fire-resistant ventilation network. This network features unidirectional vents and is designed to be fire-resistant and self-closing, meaning it will automatically shut down immediately following a fire.

Waterproof busbar trunking requires direct exposure to open flame to function effectively. Under normal fire conditions, it cannot be shut down; if a fire does occur, watering it will cause water to directly enter the conductors, leading to a severe short-circuit event. Moreover, the fire-resistance vent valves are installed at intervals, which prevents uniform heat dissipation within the waterproof busbar trunking, leaving some areas with temperatures that remain uncontrolled.

The fire-resistant boards and fire-resistant cotton inside these products do not have any waterproof properties. When exposed to water spray or immersion, they will degrade and become waste, necessitating replacement. As a result, the use and installation of such fire- and water-resistant busbar trunking systems place higher environmental demands and limit their scope of application. Moreover, these systems are bulky, and their external insulation layers must be installed on-site. The installation process is complex, involving substantial labor, requiring large spaces for both laying and construction, and resulting in extended project timelines.

The waterproof busbar trunking and the busbar are actually closed one after another, while the other remains open. The enclosed busbar is commonly referred to as the waterproof busbar trunking; in other words, the waterproof busbar trunking is essentially the “vest” of the enclosed busbar. The terms "enclosed waterproof busbar trunking" and "busbar" refer to the same thing. An enclosed waterproof busbar trunking is a busbar system composed of a metal enclosure—typically made of steel or aluminum plates—conductive bars, insulating materials, and related accessories. It can be configured either as an insert-type enclosed busbar, with junction boxes inserted in the middle, or as a feed-through enclosed busbar, which has no junction boxes in the middle. It is a type of busbar whose main busbars are enclosed within a metallic casing. The enclosed waterproof busbar trunking offers the following advantages:

1. Conducive to standardization and good interchangeability.

2. The enclosed enclosure is typically made of non-magnetic or weakly magnetic materials to minimize heating. 3. The busbar is enclosed, enhancing the system’s resistance to contamination. This design is suitable for areas with severe dust and high air humidity, such as coal mines, paper mills, and chemical plants.

Enclosed busbars can be categorized into densely insulated busbars and air-insulated busbars. They are suitable for three-phase four-wire or three-phase five-wire power distribution systems with a rated operating voltage of 660V and a rated operating current ranging from 250 to 2500A. Operating at a frequency of 50Hz, these busbars feature a compact structure, high insulation strength, large current-carrying capacity, excellent interchangeability, stable electrical performance, convenient installation and maintenance, and a long service life. Series functions.

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