封闭母线槽具有散热好、阻抗低及载流量大等等优势，与电缆相比，在载流量相同的情况下，能节省铜材10-35%，能减少电能损耗15%以上。封闭母线槽很适宜交流电源，在给定的电压数值下能维持住长时段的运转。一分钟以内的交流电状态下，母线槽不会被击穿且不会带有闪络的状态。它能承载着的耐受电流、较短时段的峰值电流，都会符合规格。

Closed bus duct has advantages such as good heat dissipation, low impedance, and high current carrying capacity. Compared with cables, it can save copper materials by 10-35% and reduce electrical energy loss by more than 15% under the same current carrying capacity. Closed bus ducts are suitable for AC power sources and can maintain long-term operation at a given voltage value. Under the condition of alternating current within one minute, the bus duct will not be broken down and there will be no flashover. The withstand current it can carry and the peak current for a shorter period of time will meet the specifications.

1、封闭母线槽的使用寿命大约是电缆和分支电缆的2～3倍左右。我国香港、澳门及欧洲有些明确规定电缆使用寿命为12～15年。实际上母线槽的使用寿命则长达30～50年。母线槽可分成空气绝缘类别、密集绝缘类别。通常状态下，空气绝缘这样的母线槽固有的构架很简易，密集绝缘母线槽带有的散热特性，电流等级很高。

1. The service life of enclosed bus ducts is approximately 2-3 times that of cables and branch cables. Hong Kong, Macau, and some European countries in China clearly stipulate that the service life of cables is 12-15 years. In fact, the service life of the bus duct is as long as 30-50 years. The bus duct can be divided into air insulation category and dense insulation category. Under normal conditions, the inherent structure of bus ducts with air insulation is very simple, and densely insulated bus ducts have high-quality heat dissipation characteristics and high current levels.

2、高层建筑布设的电气竖井，封闭母线槽都配有某一插接口径，布设这类接头应考量多重的人为干扰。然而，母线槽初始的容量很大，同时构架紧凑，在偏大负荷的态势下也带有优势。

2. The electrical shafts and enclosed bus ducts installed in high-rise buildings are equipped with a certain socket diameter, and the installation of such joints should consider multiple human interference factors. However, the initial capacity of the bus duct is large, and the structure is compact, which also has advantages in situations of heavy loads.

3、采用封闭母线槽载流能力稳定，避免了不必要的电能损耗。母线槽标准满足规范规定的极限温升值的电流(即是母线槽的额定电流)是很重要的。该电流能控制母线槽的载流能力。电缆的额定电流是以截面积来确定的。计算负荷不同，桥架内电缆根数不同，使用不同的电缆桥架，桥架内的温度随着上述这些因数的不同而变化，电缆的载流能力亦随之变化。

3. The use of enclosed bus ducts ensures stable current carrying capacity and avoids unnecessary energy loss. It is important for the bus duct standard to meet the maximum temperature rise current specified in the specifications (i.e. the rated current of the bus duct). This current can control the current carrying capacity of the bus duct. The rated current of a cable is determined by its cross-sectional area. The calculation load varies, and the number of cables inside the cable tray varies. When using different cable trays, the temperature inside the cable tray changes with the above factors, and the current carrying capacity of the cable also changes accordingly.

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