1. The bridge planner should understand the specifications to ensure that the volume occupied by the cable meets the requirements, generally 40% is better. Try not to exceed the normal density to avoid accelerating the aging of cable insulation. Otherwise, it is necessary to increase cables and investment.

2.山东桥架的电缆和电线不能铺设在同一个线槽中。原因是这两种电线的允许温度不同，电线的绝缘层相对较薄，容易被电缆拉紧。电线的机械强度不好，只需将电缆压下即可。

2. Cables and wires of Shandong bridge cannot be laid in the same trunking. The reason is that the allowable temperature of the two wires is different, and the insulation layer of the wire is relatively thin, which is easy to be tensioned by the cable. The mechanical strength of the wire is not good. Just press the cable down.

3.不同类型的电缆不应敷设在同一线槽中，主要是由于工作温度不一致，如VV系列65度和YJY系列90度。如果铺设相同的线槽，耐低温电缆会加速绝缘老化。

3. Different types of cables shall not be laid in the same trunking, mainly due to the inconsistent working temperature, such as VV series 65 degrees and yjy series 90 degrees. If the same trunking is laid, the insulation aging of low temperature resistant cables will be accelerated.

4.线槽内敷设的电缆容量应根据同一线槽内的电缆数量和敷设环境温度进行汇总和考虑。一般而言，应将其视为电缆额外容量的百分之60至百分之80。对于塑料线槽，由于散热不良，应将其视为百分之50至百分之70。

4. The cable capacity laid in the trunking shall be summarized and considered according to the number of cables in the same trunking and the laying ambient temperature. In general, it shall be considered as 60 to 80 per cent of the additional capacity of the cable. For plastic trunking, due to poor heat dissipation, it shall be regarded as 50% to 70%.

5.由于其特殊的结构(内部增加了防火棉和防火板)，防火桥架的内部空间小于普通桥架。选择时注意电缆的占地面积比。散热条件差，电缆负载流量可视为电缆额外负载流量的百分之40至百分之60。自重比普通桥架重，因此在规划和固定支吊架时，不能按照钢制桥规划规范中的标准距离设置，应增加密度。建议根据拟建桥架的大小选择1-1.5m的距离。

5. Due to its special structure (fire-proof cotton and fire-proof board are added inside), the internal space of fire-proof bridge is smaller than that of ordinary bridge. Pay attention to the floor area ratio of the cable when selecting. The heat dissipation condition is poor, and the cable load flow can be regarded as 40% to 60% of the additional load flow of the cable. The dead weight is heavier than the ordinary bridge. Therefore, when planning and fixing the supports and hangers, it cannot be set according to the standard distance in the planning specification of steel bridge, and the density should be increased. It is recommended to select a distance of 1-1.5m according to the size of the proposed bridge frame.

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