全长大于30米的电缆桥架，中间增加与保护导体的连接怎么做？

　　《建筑电气与智能化通用规范》GB55024-2022的8.7.1条：

　　Article 8.7.1 of the General Code for Electrical and Intelligent Construction GB55024-2022: 8.7.1 电缆桥架本体之间的连接应牢固可靠，金属电缆桥架与保护导体的连接应符合下列规定:

　　1 电缆桥架全长不大于30m时，不应少于2处与保护导体可靠连接;全长大于30m时，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;

　　2 非锁锌电缆桥架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面积应符合设计要求:

　　锁锌电缆桥架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

　　24DX002-1《建筑电气与智能化通用规范》图示P182页如下：

　　The diagram on page 182 of 24DX002-1 "General Code for Electrical and Intelligent Construction of Buildings" is as follows:

　　当桥架的总长度a+b+c大于30米时，桥架每隔20~30米与就近的保护导体可靠连接。这个保护导体可以是设置在桥架外（如上图所示）。

　　When the total length a+b+c of the bridge is greater than 30 meters, the bridge should be reliably connected to the nearest protective conductor every 20-30 meters. This protective conductor can be installed outside the bridge (as shown in the above figure).

　　但是这个就近的保护导体如何得到呢？

　　But how can this nearby protective conductor be obtained?

　　这个保护导体可以是人为专门敷设的，也可以引自就近配电箱的PE排。

　　This protective conductor can be intentionally laid or sourced from the PE busbar of the nearest distribution box.

　　采用沿着桥架专门敷设一根保护导体（通常是沿着桥架敷设一根热镀锌扁钢）才是简洁的办法。

　　The simplest and most efficient method is to lay a protective conductor along the bridge (usually a hot-dip galvanized flat steel).

　　图片

　　image

　　那有了专门敷设的一根保护导体（一根热镀锌扁钢）后，桥架本体之间的跨接线还需要吗？

　　After having a specially laid protective conductor (a hot-dip galvanized flat steel), is there still a need for jumper wires between the bridge bodies?

　　《建筑电气与智能化通用规范》GB55024-2022的8.7.1条

　　Article 8.7.1 of the General Code for Electrical and Intelligent Construction GB55024-2022

　　2）非镀锌电缆桥架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面积应符合设计要求；

　　2) The two ends of the connecting plate between non galvanized cable trays should be bridged with protective connecting conductors, and the cross-sectional area of the protective connecting conductors should meet the design requirements;

　　3） 镀锌电缆桥架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。

　　3) When the galvanized cable tray body does not cross connect the protective connecting conductor, there should be no less than 2 connection fixing bolts with anti loosening nuts or anti loosening washers at each end of the connecting plate.

　　要，桥架本体之间的跨接线是保护联接导体，他的作用和前面的长度大于30米的桥架中间增加与保护导体的连接点作用不同。

　　The jumper wire between the bridge bodies is used to protect the connecting conductor, which is different from the connection point between the protective conductor and the middle of the bridge with a length greater than 30 meters in front.

　　桥架之间的跨接线是让不同段的桥架处于同一电位，而距离较长的桥架增加与保护导体的连接点是为了让其处于地电位。

　　The jumper wires between cable trays are used to keep different sections of the trays at the same potential, while adding connection points with protective conductors for longer distance trays is to keep them at ground potential.

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