建筑电气设计和施工中，电缆桥架是要做接地的，这点是比较明确的，但是电缆桥架的支架是否也要做接地？电缆桥架接地标准又是什么呢？下面就让 济南电缆桥架厂家给大家简单分析一下吧！

In the electrical design and construction of buildings, it is clear that the cable tray should be grounded, but should the support of the cable tray also be grounded? What is the grounding standard of cable tray? Now let Jinan cable bridge manufacturer give you a brief analysis!

我们所说的电缆桥架接地，更明确一点是指电缆桥架与保护导体相连接，其目的是在桥架内部的电缆发生绝缘破损而使相线与桥架接触时（发生单相接地故障），接地故障电流能通过保护导体（PE线）返回变压器的中性点，使得发生绝缘破损的电缆回路的保护电器能及时切除该接地故障，从而消除安全隐患，所以电缆桥架需要做接地。

The grounding of the cable bridge we mentioned more clearly refers to the connection between the cable bridge and the protective conductor. Its purpose is to ensure that the grounding fault current can return to the neutral point of the transformer through the protective conductor (PE line) when the insulation of the cable inside the bridge is damaged and the phase line is in contact with the bridge (single-phase grounding fault occurs), so that the protective apparatus of the cable circuit with the insulation damage can remove the grounding fault in time, Therefore, the cable bridge needs to be grounded.

在施工时必须采取以下措施来确保电缆桥架安全接地：

During construction, the following measures must be taken to ensure the safe grounding of cable tray:

（1）熟悉施工设计文件中关于接地干线设置、连接位置，以及接地干线截面、跨接接地线截面选择等内容。

(1) Be familiar with the setting and connection position of grounding main line, as well as the selection of grounding main line section and jumper grounding wire section in the construction design document.

（2）接地点可在电气预埋阶段预留引出，以满足电缆桥架的始端、末端及中间部位的接地要求。接地干线材质、截面应符合设计要求。当设计未作要求时，可参照《验收规范》中保护导体（PE线导体）截面的规定选择截面。当接地干线采用型钢（如扁钢或圆钢），其截面应符合设计要求或按相应电导值进行换算。

(2) The grounding point can be reserved and led out at the electrical embedding stage to meet the grounding requirements at the beginning, end and middle of the cable tray. The material and section of grounding main line shall meet the design requirements. If there is no requirement in the design, the section can be selected according to the provisions of the section of the protective conductor (PE line conductor) in the Acceptance Code. When the grounding main line adopts section steel (such as flat steel or round steel), its section shall meet the design requirements or be converted according to the corresponding conductivity value.

（3）跨接接地线应采用铜芯软导线或镀锡铜编织线，不应采用单股铜芯导线，其截面应符合设计要求。当设计未作要求时，跨接线允许截面应不小于4平方毫米（铜质）、不大于25平方毫米（铜质）。

(3) The jumper grounding wire shall be copper core flexible wire or tinned copper braided wire, instead of single stranded copper core wire, and its section shall meet the design requirements. When there is no requirement in the design, the allowable cross section of jumper wire shall be no less than 4 mm2 (copper) and no more than 25 mm2 (copper).

（4）跨接接地宜采用焊接在电缆桥架本体上的专用接地螺栓作为跨接接地线连接点，不宜采用连接板连接螺栓作为跨接接地线的连接点；若产品未带有专用接地螺栓，而施工中用连接板的螺栓进行跨接接地连接时，应将跨接接地连接处的不导电涂层进行处理，以保证跨接接地线的可靠电气连通。

(4) The special grounding bolt welded on the cable bridge body should be used as the connection point of the jumper grounding wire, and the connecting plate connecting bolt should not be used as the connection point of the jumper grounding wire; If the product is not equipped with a special grounding bolt, and the bolt of the connecting plate is used for the jumper grounding connection during construction, the non-conductive coating at the jumper grounding connection shall be treated to ensure the reliable electrical connection of the jumper grounding wire.

（5）跨接接地可采用每节电缆桥架之间的跨接接地线进行跨接连接，也可采用沿电缆桥架全长敷设一根铜排或铜芯导线或镀锌型钢（扁钢或圆钢）作为接地干线，每节（包括直通、弯通等等电缆桥架应至少有1处与其进行可靠连接。连接处的连接螺栓应配置弹簧垫圈，保证连接紧固可靠。

(5) The jumper grounding wire between each section of cable bridge can be used for jumper connection, or a copper bar or copper core wire or galvanized steel (flat steel or round steel) can be laid along the full length of the cable bridge as the grounding main line. Each section of cable bridge (including straight-through, bend-through, etc.) should have at least one reliable connection with it. The connecting bolts at the connection should be equipped with spring washers to ensure that the connection is tight and reliable.

（6）对于镀锌电缆桥架可利用其镀锌的连接板进行跨接，而不必采用跨接线进行跨接，但连接板的两端应不少于2个有防松螺帽或防松垫圈的螺栓进行连接固定，避免出现连接松动、脱开等现象，保证跨接接地的可靠连接。

(6) Galvanized cable tray can be bridged by its galvanized connection plate instead of jumper wire, but the two ends of the connection plate shall be connected and fixed by not less than 2 bolts with locking nuts or washers to avoid loosening and disconnection of the connection and ensure reliable connection of the jumper grounding.

（7）支、托、吊架应与电缆桥架可靠连接并接地，可与沿电缆桥架全长敷设的一根铜排或铜芯导线或镀锌扁钢作为PE线的接地线相连接，也可与已有接地电缆桥架进行跨接连接，如可用铜芯软导线或镀锡铜编织线进行跨接连接，或不少于2处用爪型螺母与电缆桥架进行连按固定，使其与电缆桥架形成可靠的电气连通。

(7) The support, bracket and hanger shall be reliably connected and grounded with the cable tray, and can be connected with a copper bar or copper core wire or galvanized flat steel laid along the full length of the cable tray as the grounding wire of PE line, or can be connected with the existing grounding cable tray by jumper connection, such as copper core flexible wire or tinned copper braided wire, or at least 2 places can be connected and fixed with the cable tray by claw nut, Make it form a reliable electrical connection with the cable tray.

针对以上的问题，我们再次做出了解答，您对此有怎样的疑惑点可以随时来我们网站 //www.comprepyme.com进行咨询了解！

We have answered the above questions again. If you have any doubts about this, please come to our website at any time //www.comprepyme.com Consult and understand!