The connection between the metal ladder, tray or slot box body shall be firm and reliable, and the connection with the protective conductor shall comply with the following provisions:

梯架、托盘和槽盒全长不大于30m时，不应少于2处与保护导体可靠连接；全长大于30m时，应每隔20m~30m应增加一个连接点，起始端和终点端均应可靠接地。

When the total length of ladder, tray and slot box is not more than 30m, at least 2 places shall be reliably connected with the protective conductor; When the total length is more than 30m, a connection point shall be added every 20m ~ 30m, and the starting end and ending end shall be reliably grounded.

非镀锌梯架、托盘和槽盒本体之间连接板的两端应跨接保护联结导体，保护联结导体的截面积应符合设计要求。

The two ends of the connecting plate between the non galvanized ladder, tray and slot box body shall be bridged with the protective connecting conductor, and the cross-sectional area of the protective connecting conductor shall meet the design requirements.

镀锌梯架、托盘和槽盒本体之间不跨接保护联结导体时，连接板每端不应少于2个有防松螺帽或防松垫圈的连接固定螺栓。

When the protective connecting conductor is not bridged between the galvanized ladder, tray and slot box body, each end of the connecting plate shall not be less than 2 connecting and fixing bolts with anti loose nuts or anti loose washers.

平直线段桥架吊架间距1.5m~2m，如果采用吊杆支架，吊杆直径不应小于8mm，且需在过梁处应设置固定支架。

The distance between bridge hangers in straight section is 1.5m ~ 2m. If suspender support is used, the diameter of suspender shall not be less than 8mm, and fixed support shall be set at lintel.

图片转弯处两边各设一组吊架，且两组吊架对称布置，间距不大于1.5米，否则转弯中间位置增设一组吊架。

In the picture, a group of hangers are set on both sides of the turn, and the two groups of hangers are symmetrically arranged with a spacing of no more than 1.5m, otherwise a group of hangers is added in the middle of the turn.

图片转弯处两边各设一组吊架，且两组吊架对称布置，间距不大于1.5米，否则转弯中间位置增设一组吊架；顶层桥架距楼板距离不小于150mm，上下层桥架间距不小于150mm。

In the picture, a group of hangers are set on both sides of the turn, and the two groups of hangers are symmetrically arranged with a spacing of no more than 1.5m, otherwise a group of hangers is added in the middle of the turn; The distance between the top tray and the floor slab shall not be less than 150mm, and the spacing between the upper and lower trays shall not be less than 150mm.

图片桥架、线槽按砼特殊角度准确放样、加工、安装。微信公众号：建筑水电知识平台图片直线段钢制电缆桥架长度超过30米、铝合金或者玻璃钢制电缆桥架长度超过15米设有伸缩节；电缆桥架跨越建筑物变形缝处设置补偿装置。

Picture accurate setting out, processing and installation of bridge and trunking according to the special angle of concrete. WeChat public No.: building hydropower knowledge platform picture straight section steel cable bridge length over 30 meters, aluminum alloy or FRP cable bridge length more than 15 meters with expansion joint; official account: Compensation device shall be set at the deformation joint where the cable tray crosses the building.

图片金属电缆桥架及其支架全长应不少于2处于接地干线相连接；桥架首位两端需与配电柜外壳或地线排可靠连接。

Picture: the total length of metal cable tray and its support shall not be less than 2, which shall be connected with the grounding trunk line; Both ends of the bridge shall be reliably connected with the shell of the distribution cabinet or the ground wire row.

图片非镀锌电缆桥架间连接板的两端跨接铜芯接地线，跨接地线一定要注意线槽桥架专用接地孔上，地线的小允许截面积不小于4mm?；连接前剔除接地螺栓下方的绝缘层；镀锌桥架间连接板的两端不跨接接地线，但连接板两端不少于2个有防松螺帽或防松垫圈的连接固定螺栓。

The two ends of the connecting plate between non galvanized cable trays are connected with copper core grounding wire. The grounding wire must be paid attention to the special grounding hole on the trunking tray, and the minimum allowable cross-sectional area of the grounding wire shall not be less than 4mm?; Remove the insulating layer under the grounding bolt before connection; The two ends of the connecting plate between galvanized bridges shall not cross the grounding wire, but the two ends of the connecting plate shall not be less than 2 connecting and fixing bolts with anti loose nuts or anti loose washers.

图片与土建配合，桥架穿越墙体、楼板等部位预先留孔。

The picture is coordinated with the civil engineering, and holes are reserved in advance for the bridge crossing the wall, floor and other parts.

图片线槽、桥架底板应与支吊架横担用金属螺栓固定（≤200mm，用一个螺栓固定；＞200mm，距边1/4处两个螺栓固定）。

Picture: the bottom plate of trunking and bridge shall be fixed with metal bolts with the cross arm of supports and hangers (≤ 200mm, fixed with one bolt; > 200mm, fixed with two bolts at 1 / 4 from the edge).

桥架穿越墙体及楼板，应用不燃材料封堵；穿越防火分区桥架内必须做防火封堵。

When the bridge crosses the wall and floor, it shall be blocked with incombustible materials; Fire blocking must be done in the bridge crossing the fire compartment.

图片室外安装桥架安装高度不能低于积雪、积水高度，同时考虑选用防水型盖板，进出室外桥架、线槽，室内须高于室外，防止雨水流入室内。

The installation height of outdoor installation bridge shall not be lower than the height of snow and ponding. At the same time, waterproof cover plate shall be considered to be selected. In and out of outdoor bridge and trunking, the indoor shall be higher than the outdoor to prevent rainwater from flowing into the room.

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