做电气工程的人对桥架都不陌生，图纸上几条线，工地上就是一长溜铁架子。但真到采购和安装的时候，桥架的材质、规格、表面处理随便哪个环节没选对，后面不是验收卡住，就是用了几年锈蚀变形，维护换线都费劲。山东做桥架的厂家不少，价格差得也多，选之前把几件事弄明白，比单纯比价有用。

Electrical engineers are no strangers to cable trays, with several lines on the drawings and a long iron frame on the construction site. But when it comes to procurement and installation, if the material, specifications, and surface treatment of the bridge are not selected correctly, it will either get stuck during acceptance or rust and deform after several years of use, making maintenance and replacement difficult. There are many manufacturers in Shandong who make cable trays, and the prices are much different. Understanding a few things before choosing is more useful than simply comparing prices.

先分清桥架类型，别拿梯级式当槽式用。 梯级式桥架像梯子，散热好、重量轻，适合敷设大截面动力电缆；托盘式底部有散热孔，防护性比梯级式好，适合动力和控制电缆混敷；槽式是全封闭的，防尘防干扰，用在有腐蚀性环境或者需要屏蔽信号的场合。如果项目里既有动力电缆又有信号电缆，混在一起走的时候槽式或者带隔板的托盘式更稳妥，能减少电磁干扰。选型第一步不是问价格，而是把图纸上的电缆类型和敷设要求摊开看。

First, distinguish the type of cable tray and do not use the stepped type as a trough type. The stepped bridge is like a ladder, with good heat dissipation and light weight, suitable for laying large section power cables; The tray style bottom has heat dissipation holes, which provide better protection than the stepped style and are suitable for mixing power and control cables; The slot type is fully enclosed, dustproof and anti-interference, and is used in corrosive environments or situations where signal shielding is required. If there are both power cables and signal cables in the project, mixing them together in a trough or tray with partitions is more secure and can reduce electromagnetic interference. The first step in selection is not to ask about the price, but to open up the cable types and laying requirements on the drawing.

材质和表面处理，看环境说话。 普通室内干燥环境，电镀锌桥架够用，成本也低；地下室、厨房、化工厂这些潮湿或者有腐蚀介质的地方，热镀锌或者铝合金更合适。热镀锌层厚、附着力强，户外和潮湿环境寿命长；铝合金轻、耐腐蚀，但承重能力比钢制桥架弱，大跨距场合要核算荷载。防火要求高的场所，比如变电站、高层建筑的电气竖井，可能需要防火桥架。山东这边做桥架的厂家，表面处理工艺差别不小，冷镀锌和热镀锌看着都是银色，防腐年限差好几倍，采购时要问清楚工艺和锌层厚度。

Material and surface treatment depend on the environment. Ordinary indoor dry environment, galvanized cable trays are sufficient and cost-effective; In damp or corrosive environments such as basements, kitchens, and chemical plants, hot-dip galvanizing or aluminum alloy is more suitable. Thick hot-dip galvanized layer, strong adhesion, long service life in outdoor and humid environments; Aluminum alloy is lightweight and corrosion-resistant, but its load-bearing capacity is weaker than that of steel cable trays, and the load needs to be calculated for large-span applications. Places with high fire prevention requirements, such as substations and electrical shafts in high-rise buildings, may require fire-resistant cable trays. The manufacturers in Shandong who make cable trays have significant differences in surface treatment processes. Cold galvanizing and hot-dip galvanizing both look silver, and their anti-corrosion service life is several times different. When purchasing, it is important to clarify the process and zinc layer thickness.

大跨距桥架的荷载，不能拍脑袋。 厂房、体育馆、车站这些大空间，桥架跨度大，如果只按常规间距布支架，电缆敷满后桥架下垂、变形是常事。选大跨距桥架时要根据电缆总重量、跨距和允许挠度来核算，必要时加密支架或者选用加强型截面。另外，桥架的填充率一般建议不超过40%，留出散热和后期增容的空间，塞得太满后期加根线都费劲。山东不少项目因为厂房跨度大，桥架选型时没算荷载，验收前发现变形超标，返工代价不小。

The load of large-span bridge frames cannot be tapped on the head. Large spaces such as factories, sports halls, and stations have large spans of cable trays. If only the brackets are arranged at regular intervals, it is common for the cable trays to sag and deform after being fully laid. When selecting large-span cable trays, it is necessary to calculate based on the total weight, span, and allowable deflection of the cables. If necessary, additional supports should be added or reinforced sections should be selected. In addition, it is generally recommended that the filling rate of the bridge should not exceed 40%, leaving space for heat dissipation and later capacity expansion. If it is too full, it will be difficult to add a wire in the later stage. Many projects in Shandong, due to the large span of the factory buildings, did not take into account the load when selecting the bridge frame. Before acceptance, it was found that the deformation exceeded the standard, and the cost of rework was not small.

安装细节和接地，验收时查得非常细。 桥架转弯、分支处要用成品弯通和三通，现场切割焊接的容易破坏镀锌层，时间一长生锈。接地跨接不能省，每段桥架之间要有可靠的接地连接，否则整个桥架系统形同虚设。桥架穿越防火分区时要做防火封堵，这一步验收时查得很细，前期不做后期补代价很大。山东本地的安装队伍水平参差不齐，选厂家时如果对方能提供安装指导或者整体方案，省心不少。

The installation details and grounding are checked in the most detail during acceptance. Finished bends and tees should be used for bridge bends and branches. Cutting and welding on site can easily damage the galvanized layer and rust over time. Grounding bridging cannot be omitted, and there must be reliable grounding connections between each section of the bridge, otherwise the entire bridge system will be meaningless. When the bridge passes through the fire compartment, fireproof sealing must be done. This step of inspection is very detailed, and it is costly to not do it in the early stage and make up for it in the later stage. The level of local installation teams in Shandong varies greatly. When choosing a manufacturer, if they can provide installation guidance or an overall plan, it will be much easier.

山东电缆桥架市场选择多，但桥架是装上去基本不会再动的材料，选型阶段多花点时间把类型、材质、荷载、安装这几件事确认清楚，后面几十年少很多麻烦。

There are many options in the cable tray market in Shandong, but the tray is made of materials that will not move when installed. During the selection stage, it takes more time to confirm the type, material, load, and installation, which will be much less troublesome in the following decades.

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This article is a friendly contribution from Shandong Cable Bridge For more knowledge about Shandong cable trays, please click: http://www.sdhangfeng.com We will provide detailed answers to your questions. You are welcome to log in to our website and leave a message