自动化和项目都会用到电缆，大家在选择铝合金桥架规格时，在满足填充率的前提下，还需要保证铝合金桥架宽度大于电缆单层并列宽度。

Both automation and projects will use cables. When choosing the specifications of aluminum alloy cable trays, it is necessary to ensure that the width of the aluminum alloy cable tray is greater than the width of a single layer of parallel cable trays while meeting the filling rate.

电缆单排并列宽度为442mm，铝合金桥架选用300mm(宽)×200mm(高)。填充率为26.79%，满足不大于40%的规范要求。

The single row parallel width of the cable is 442mm, and the aluminum alloy bridge is selected as 300mm (width) × 200mm (height). The filling rate is 26.79%, meeting the specification requirement of no more than 40%.

工程电缆设计标准》GB50217-2018附录D的表D.0.6多层并列电缆在托盘桥架上敷设时校正系数取值。

Table D.0.6 in Appendix D of the Engineering Cable Design Standard GB50217-2018 specifies the correction factor values for multi-layer parallel cables laid on tray trays.

电缆在桥架上单层并列敷设时，校正系数取0.7，两层并列敷设时校正系数取0.55。从经济性考虑，工程设计时通常都是按照单层敷设况下取校正系数0.7。因此在选择铝合金桥架时，桥架的宽度须大于电缆单排并列宽度。

When the cable is laid in a single layer parallel on the bridge, the correction factor is taken as 0.7, and when laid in two layers parallel, the correction factor is taken as 0.55. From an economic perspective, the correction factor of 0.7 is usually taken for single-layer installation in engineering design. Therefore, when selecting aluminum alloy cable trays, the width of the tray must be greater than the width of a single row of parallel cables.

这个案例中电缆单排并列宽度442mm，桥架宽度300mm，导致部分电缆在桥架中是两层并列敷设。如果要保证电缆使用，其载流量的校正系数按照0.55取，实际工程是按照0.7选取，因而造成电缆过载。其结果是电缆散热不利，绝缘老化加速，电缆的使用寿命会大减，并存在用电隐患。

In this case, the single row parallel width of the cable is 442mm, and the bridge width is 300mm, resulting in some cables being laid in two layers parallel in the bridge. If we want to ensure the safe use of the cable, the correction factor for its current carrying capacity is taken as 0.55, but in actual engineering, it is selected as 0.7, which causes cable overload. The result is poor cable heat dissipation, accelerated insulation aging, significantly reduced cable lifespan, and potential electrical safety hazards.

这个案例中电缆单排并列宽度442mm，桥架宽度300mm，导致部分电缆在桥架中是两层并列敷设。如果要保证电缆使用，其载流量的校正系数按照0.55取，实际工程是按照0.7选取，因而造成电缆过载。其结果是电缆散热不利，绝缘老化加速，电缆的使用寿命会大大折减，并存在用电隐患。

In this case, the single row parallel width of the cable is 442mm, and the bridge width is 300mm, resulting in some cables being laid in two layers parallel in the bridge. If we want to ensure the safe use of the cable, the correction factor for its current carrying capacity is taken as 0.55, but in actual engineering, it is selected as 0.7, which causes cable overload. The result is poor heat dissipation of the cable, accelerated insulation aging, greatly reduced service life of the cable, and potential electrical safety hazards.