1、防腐蚀等级比普通工程高出一档

1. The anti-corrosion level is one level higher than that of ordinary engineering

三峡库区常年湿度大，水雾环境对金属桥架的腐蚀性良好。普通工程用热镀锌桥架勉强够用，但在水电项目中，桥架表面往往需要额外做喷塑或采用铝合金材质。武汉电缆桥架在此类项目中，通常会根据安装区域的湿度数据，建议客户将防腐等级从普通C3提升到C4甚至C5，避免运行两三年后桥架表面大面积起皮、锈蚀。

The Three Gorges Reservoir area has high humidity all year round, and the water mist environment is highly corrosive to metal bridge structures. Hot dip galvanized cable trays are barely sufficient for ordinary engineering, but in hydropower projects, the surface of the cable tray often requires additional spraying or the use of aluminum alloy materials. In such projects, Wuhan cable trays are usually recommended to increase the anti-corrosion level from ordinary C3 to C4 or even C5 based on the humidity data of the installation area, in order to avoid large-scale peeling and corrosion on the surface of the tray after two to three years of operation.

2、跨度与承重需要单独计算，不能套用通用表

2. The span and load-bearing capacity need to be calculated separately and cannot be applied to a general table

水电厂房内部空间大，桥架跨度经常超过常规的2米标准。很多施工方习惯性照着厂家给的通用载荷表来选型，结果在大跨度段出现桥架下挠、电缆受力不均的问题。实际操作中，武汉电缆桥架的技术团队会根据具体跨距、电缆总重量和填充率，重新校核桥架的承载力，必要时增加中间支撑或换用更大规格的型号。

The internal space of the hydropower plant is large, and the span of the bridge often exceeds the conventional standard of 2 meters. Many construction companies tend to select based on the general load table provided by the manufacturer, resulting in problems such as deflection under the bridge and uneven cable stress in large-span sections. In practical operation, the technical team of Wuhan cable tray will recheck the bearing capacity of the tray based on the specific span, total cable weight, and filling rate. If necessary, intermediate supports will be added or larger models will be used.

3、接地与防火是验收硬指标，缺一不可

3. Grounding and fire prevention are hard indicators for acceptance, both of which are indispensable

水电项目对电气安全的要求非常严格。电缆桥架全程需要可靠接地，接头处的跨接线不能省略，接地电阻值也有明确的数值要求。防火方面，桥架穿越墙体和楼板时需要加装防火封堵，内部电缆的填充率也控制在40%以内，防止热量积聚。这些细节在普通商业项目中容易被简化，但在三峡这类工程里，每一项都是验收的必查项。

Hydropower projects have very strict requirements for electrical safety. The entire cable tray needs to be reliably grounded, and the jumper wires at the joints cannot be omitted. The grounding resistance value also has clear numerical requirements. In terms of fire prevention, fireproof sealing should be installed when the bridge passes through walls and floors, and the filling rate of internal cables should be controlled within 40% to prevent heat accumulation. These details are easy to simplify in ordinary commercial projects, but in projects like the Three Gorges, each one is a mandatory inspection item for acceptance.

大型水电项目对电缆桥架的要求，本质上是对安全冗余的追求。从防腐、承重到接地防火，每个环节都有独立的技术标准支撑。与其等验收时返工，不如在方案阶段就把特殊工况考虑进去。

The requirements for cable trays in large-scale hydropower projects are essentially the pursuit of safety redundancy. From anti-corrosion, load-bearing to grounding and fire prevention, each link is supported by independent technical standards. Instead of waiting for rework during acceptance, it is better to consider special working conditions during the planning phase.

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