根據強電和弱電選擇填充率，橋架寬度和高度的選擇應符合填充率的要求，電纜的梯架的填充率在一般情況下，電力電纜可取40%～50%，控制電纜可取50%～70%，且宜預留10%～25%工程發展裕量。

　　According to the filling rate of strong and weak electricity selection, the selection of the width and height of the bridge should be in accordance with the requirement of filling rate. The filling rate of the cable ladder is in general condition, the power cable is 40% to 50%, the control cable is 50% ~ 70%, and the development margin of 10% to 25% should be reserved.

　　負荷等級要大于預算等級，在選擇梯式電纜橋架的荷載等級時，橋架的工作均布荷載不應大于所選橋架荷載等級的額定均布荷載，如果橋架的支吊架的實際跨距不等于2m時，則工作均布荷載應滿足要求。

　　The load grade is greater than the budget grade. When choosing the load grade of the ladder type cable bridge, the uniform load of the bridge should not be larger than the rated uniform load of the load grade of the selected bridge. If the actual span of the bridge hanger is not equal to 2m, the uniform load should be full.

　　大跨距橋架要驗證，對于跨距大于6m的鋼制橋架和跨距大于2m或承載要求大于荷載等級D級的鋁合金橋架，應按工程條件進行強度、剛度及穩定性的計算或試驗驗證。

　　A large span bridge should be verified that the strength, stiffness and stability of a steel bridge with a span of greater than 6m and an aluminum alloy bridge with a span greater than 2m or a load-carrying requirement of D higher than the load level should be calculated or tested.

　　是否有防火要求，橋架在有防火要求的區段內，可在梯架、托盤內添加具有耐火或難燃性能的板、網等材料構成封閉或半封閉式結構，并采取在橋架及其支吊架表面涂刷防火涂層等措施，其整體耐火性能應滿足有關規范或標準的要求，在工程防火要求較高的場所，不宜采用鋁合金電纜橋架。

　　If there are fire protection requirements, the bridge can be added to the ladder and tray with fireproof or flammable properties to form a closed or semi closed structure in the ladder and tray, and to apply a fire proof coating on the surface of the bridge and its supporting hanger, and the overall fire resistance of the bridge shall meet the national standards or the relevant standards. The standard requirement is that aluminum alloy cable bridge should not be used in places where fire safety requirements are high.

　　組件必須匹配，各種組件及支吊架在滿足相應荷載的條件下，其規格尺寸應與托盤、梯架的直線段、彎通系列相匹配。

　　Components must be matched, and the specifications and sizes of various components and support frames should be matched with the line and bend series of the tray, the ladder frame and the staircase.

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