Low voltage control cabinet, which must meet or exceed the third class bracket standards of all OEM manufacturers. If you want to install tower or desktop devices, sliding frames and installation accessories are necessary. Due to the installation including network cables, telecommunications cables, and power cables, it is necessary to purchase hook and loop straps or toothed straps to effectively secure the cables in an orderly manner inside the cabinet. If the cabinet comes with a cable management module that allows the cables to be directly fixed inside the vertical installation rail, it would be great. In either case, there should be sufficient fixing rings on the upper and side walls inside the cabinet to protect the cables, or the cabinet bottom plate can be lifted up for wiring underneath.

如果选择的网络机箱机柜不合适，把所安装设备中贵重的部分---服务器装进机柜后，就会发现机柜的空间所剩无几。相反，如果遵循下面的检查顺序，你就能选出既符合你的安装顺序(包括稳定性、耐久度、兼容性和是否易于装卸)，又不会超出你的预算的机柜。

If the selected network chassis cabinet is not suitable, and the valuable part of the installed equipment - the server - is installed in the cabinet, it will be found that there is very little space left in the cabinet. On the contrary, if you follow the inspection sequence below, you can select cabinets that meet your installation priorities (including stability, durability, compatibility, and ease of loading and unloading) without exceeding your budget.

接下来，列出所有装在机柜内的设备和它们完整的测量数据：高、长、宽、重量。

Next, list all devices installed in the cabinet and their complete measurement data: height, length, width, and weight.

这些设备的总高度将终决定可以把多少设备装进机柜。显然，高的机柜能装进更多的设备，而且更省地方。当然尽量利用机柜的高度不是考虑，机柜的后部也有很大的地方可以利用。这就是要测量机柜深度的原因。选择较深的机柜，可以把两套设备背靠背地装进去，从而安装更多的设备。采用上述方式可在机柜中装入两排设备，一排从机柜的前门装卸，另一排从后门装卸。机柜应有可调节的垂直导轨架，可以装入不同深度的设备，同时使机柜根据设备的深度而保持小深度。

The total height of these devices will ultimately determine how many devices can be installed in the cabinet. Obviously, taller cabinets can accommodate more equipment and save more space. Of course, maximizing the height of the cabinet is not a consideration, and there is also a large area at the back of the cabinet that can be utilized. This is why we need to measure the depth of the cabinet. Choosing a deeper cabinet allows for the installation of two sets of equipment back to back, allowing for the installation of more equipment. By using the above method, two rows of equipment can be installed in the cabinet. One row is loaded and unloaded from the front door of the cabinet, and the other row is loaded and unloaded from the back door. The cabinet should have adjustable vertical guide rails that can accommodate equipment of different depths, while maintaining a small depth according to the depth of the equipment.

在计算完了机柜空间(以“U”或1.75英寸为单位)之后，还要考虑房间的大小。你不会愿意看到塞满机柜后不久就发现还要再装进一些设备。一旦你把机柜买来并安装完，这些多出的设备往往就出现了。所以，作为一条基本原则，机柜高度要多出百分之二十到百分之三十以备系统扩充。这些空间也改善了设备的通风条件。

After calculating the cabinet space (in units of "U" or 1.75 inches), the size of the room also needs to be considered. You don't want to see the cabinets filled up and soon realize that some more equipment needs to be installed. Once you buy and install the cabinet, these extra devices often appear. So, as a basic principle, the cabinet height should be increased by 20% to 30% in preparation for system expansion. These spaces also improve the ventilation conditions of the equipment.

装有支架的设备不需要考虑宽度，因为它是按机柜的宽度设计的。但对于不能安支架的服务器及其他外设，宽度是不能忽视的。由于设备的总重量往往不轻，所以要选一个能装大约1500磅的机柜，也就是说，要选受力结构好的、牢固的机柜。在机柜里面，设备重量决定选择的滑动架是标准的还是加重的，也决定其它一些附件的选择。

Devices equipped with brackets do not need to consider width, as they are designed according to the width of the cabinet. But for servers and other peripherals that cannot be installed with brackets, the width cannot be ignored. Due to the fact that the total weight of the equipment is often not light, it is necessary to choose a cabinet that can hold approximately 1500 pounds, which means choosing a cabinet with a good load-bearing structure and a sturdy structure. In the cabinet, the weight of the equipment determines whether the sliding frame selected is standard or weighted, and also determines the selection of other accessories.