封閉母線槽具有散熱好、阻抗低及載流量大等等優勢，與電纜相比，在載流量相同的情況下，能節省銅材10-35%，能減少電能損耗15%以上。封閉母線槽很適宜交流電源，在給定的電壓數值下能維持住長時段的運轉。一分鐘以內的交流電狀態下，母線槽不會被擊穿且不會帶有閃絡的狀態。它能承載著的耐受電流、較短時段的峰值電流，都會符合規格。

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、封閉母線槽的使用壽命大約是電纜和分支電纜的2～3倍左右。我國香港、澳門及歐洲有些明確規定電纜使用壽命為12～15年。實際上母線槽的使用壽命則長達30～50年。母線槽可分成空氣絕緣類別、密集絕緣類別。通常狀態下，空氣絕緣這樣的母線槽固有的構架很簡易，密集絕緣母線槽帶有的散熱特性，電流等級很高。

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、高層建筑布設的電氣豎井，封閉母線槽都配有某一插接口徑，布設這類接頭應考量多重的人為干擾。然而，母線槽初始的容量很大，同時構架緊湊，在偏大負荷的態勢下也帶有優勢。

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、采用封閉母線槽載流能力穩定，避免了不必要的電能損耗。母線槽標準滿足規范規定的極限溫升值的電流(即是母線槽的額定電流)是很重要的。該電流能控制母線槽的載流能力。電纜的額定電流是以截面積來確定的。計算負荷不同，橋架內電纜根數不同，使用不同的電纜橋架，橋架內的溫度隨著上述這些因數的不同而變化，電纜的載流能力亦隨之變化。

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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