母线槽应该是金属封闭的，符合IEC62271-200标准。母线槽的金属外壳与开关设备的金属外壳一样，具有多种功能。下面山东电缆桥架厂家为您分析一番：

The bus duct should be metal enclosed and comply with IEC62271-200 standard. The metal casing of the bus duct, like the metal casing of the switchgear, has multiple functions. The following cable tray manufacturer will analyze for you:

它保护人员免受接触带电导体的危险。

It protects personnel from the danger of contact with live conductors.

它为导体及其绝缘系统提供机械支撑。

It provides mechanical support for conductors and their insulation systems.

它保护导体免受机械损坏和环境破坏。

It protects conductors from mechanical damage and environmental damage.

在谈论金属外壳时，我们想到的材料是钢——普通的日常冷轧碳钢。然而，钢作为外壳材料有一些缺点。重要的是，它是磁性的，导体周围的磁场会在外壳中感应出循环电流。这些电流有几个不良影响。当它们流过钢的阻力时，它们代表能量损耗。反过来，这会升高外壳的温度，降低散发母线中产生的热量的效率，使整个母线管道运行得更热。

When discussing metal shells, the first material we think of is steel - ordinary daily cold-rolled carbon steel. However, steel as a shell material has some drawbacks. Importantly, it is magnetic, and the magnetic field around the conductor induces a circulating current in the casing. These currents have several adverse effects. When they flow through the resistance of steel, they represent energy loss. Conversely, this will increase the temperature of the casing, reduce the efficiency of dissipating heat generated in the busbar, and make the entire busbar duct run hotter.

这有效地降低了母线槽的连续电流额定值，因为连续电流额定值由导体和外壳的温升决定。

This effectively reduces the continuous current rating of the bus duct, as the continuous current rating is determined by the temperature rise of the conductor and enclosure.

减少这些磁效应的常用方法是少用非磁性材料（通常是铝）制作母线管道外壳的一侧。通常的做法是制作额定电流超过1200A的铝制母线槽顶盖。在某些非常高的额定值下，整个母线槽外壳可能由铝制成。

A common method to reduce these magnetic effects is to make at least one side of the busbar duct casing using non-magnetic materials (usually aluminum). The usual practice is to make an aluminum busbar duct cover with a rated current exceeding 1200A. At certain very high ratings, the entire bus duct casing may be made of aluminum.

钢的另一个缺点是，即使在镀锌钢上涂上良好的油漆，它在某些恶劣环境中也可能无法承受。经常将镀锌钢用于所有户外总线管道外壳。在较小程度上，铝也可能存在环境问题。如果钢不适合，而铝适合，则参考全铝母线槽外壳。

Another disadvantage of steel is that even if good paint is applied to galvanized steel, it may not be able to withstand certain harsh environments. Galvanized steel is often used for all outdoor bus duct enclosures. To a lesser extent, aluminum may also have environmental issues. If steel is not suitable and aluminum is suitable, then refer to the full aluminum bus duct casing.

但是，如果镀锌碳钢和铝都不适合该环境，则第三种选择是将母线槽外壳制成不锈钢，它可以很好地承受恶劣的环境并且也是无磁性的。使用不锈钢的缺点是成本高。基本原材料比碳钢或铝贵得多，制造它需要付出更大的努力。如果情况需要，将为母线槽提供不锈钢外壳，并提供适当的。由于上涨，除非确实需要材料，否则不应指定不锈钢母线槽外壳。

However, if both galvanized carbon steel and aluminum are not suitable for this environment, the third option is to make the bus duct casing stainless steel, which can withstand harsh environments well and is also non magnetic. The disadvantage of using stainless steel is its high cost. The basic raw materials are much more expensive than carbon steel or aluminum, and manufacturing them requires greater effort. If the situation requires, stainless steel casing will be provided for the bus duct and an appropriate price will be provided. Due to price increases, stainless steel bus duct enclosures should not be specified unless materials are indeed required.

对于4000A的母线桥，使用不锈钢外壳是必须的，因为非导磁材料由母线因涡流引起的发热实在太大，损耗巨大，从而造成温升超标，而采用不锈钢材质则可降低温升，轻松的通过温升试验。更多相关内容就来我们网站http://www.sdhangfeng.com咨询！

For the 4000A bus bridge, using a stainless steel shell is necessary because the non magnetic material causes too much heat and huge losses due to eddy currents in the bus, resulting in excessive temperature rise. However, using stainless steel material can reduce the temperature rise and easily pass the temperature rise test. For more related content, come to our website http://www.sdhangfeng.com consulting service