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.山東橋架的電纜和電線不能鋪設在同一個線槽中。原因是這兩種電線的允許溫度不同，電線的絕緣層相對較薄，容易被電纜拉緊。電線的機械強度不好，只需將電纜壓下即可。

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.不同類型的電纜不應敷設在同一線槽中，主要是由于工作溫度不一致，如VV系列65度和YJY系列90度。如果鋪設相同的線槽，耐低溫電纜會加速絕緣老化。

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.線槽內敷設的電纜容量應根據同一線槽內的電纜數量和敷設環境溫度進行匯總和考慮。一般而言，應將其視為電纜額外容量的百分之60至百分之80。對于塑料線槽，由于散熱不良，應將其視為百分之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.由于其特殊的結構(內部增加了防火棉和防火板)，防火橋架的內部空間小于普通橋架。選擇時注意電纜的占地面積比。散熱條件差，電纜負載流量可視為電纜額外負載流量的百分之40至百分之60。自重比普通橋架重，因此在規劃和固定支吊架時，不能按照鋼制橋規劃規范中的標準距離設置，應增加密度。建議根據擬建橋架的大小選擇1-1.5m的距離。

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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