全長大于30米的電纜橋架，中間增加與保護導體的連接怎么做？

　　《建筑電氣與智能化通用規(guī)范》GB55024-2022的8.7.1條：

　　Article 8.7.1 of the General Code for Electrical and Intelligent Construction GB55024-2022: 8.7.1 電纜橋架本體之間的連接應牢固可靠，金屬電纜橋架與保護導體的連接應符合下列規(guī)定:

　　1 電纜橋架全長不大于30m時，不應少于2處與保護導體可靠連接;全長大于30m時，每隔20m~30m應增加一個連接點起始端和終點端均應可靠接地;

　　2 非鎖鋅電纜橋架本體之間連接板的兩端應跨接保護聯(lián)結(jié)導體，保護聯(lián)結(jié)導體的截面面積應符合設(shè)計要求:

　　鎖鋅電纜橋架本體之間不跨接保護聯(lián)結(jié)導體時，連接板每端不應少于2個有防松螺帽或防松墊圈的連接固定螺栓

　　24DX002-1《建筑電氣與智能化通用規(guī)范》圖示P182頁如下：

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

　　當橋架的總長度a+b+c大于30米時，橋架每隔20~30米與就近的保護導體可靠連接。這個保護導體可以是設(shè)置在橋架外（如上圖所示）。

　　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).

　　但是這個就近的保護導體如何得到呢？

　　But how can this nearby protective conductor be obtained?

　　這個保護導體可以是人為專門敷設(shè)的，也可以引自就近配電箱的PE排。

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

　　采用沿著橋架專門敷設(shè)一根保護導體（通常是沿著橋架敷設(shè)一根熱鍍鋅扁鋼）才是簡潔的辦法。

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

　　圖片

　　image

　　那有了專門敷設(shè)的一根保護導體（一根熱鍍鋅扁鋼）后，橋架本體之間的跨接線還需要嗎？

　　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?

　　《建筑電氣與智能化通用規(guī)范》GB55024-2022的8.7.1條

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

　　2）非鍍鋅電纜橋架本體之間連接板的兩端應跨接保護聯(lián)結(jié)導體，保護聯(lián)結(jié)導體的截面面積應符合設(shè)計要求；

　　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） 鍍鋅電纜橋架本體之間不跨接保護聯(lián)結(jié)導體時，連接板每端不應少于2 個有防松螺帽或防松墊圈的連接固定螺栓。

　　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，橋架本體之間的跨接線是保護聯(lián)接導體，他的作用和前面的長度大于30米的橋架中間增加與保護導體的連接點作用不同。

　　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.

　　橋架之間的跨接線是讓不同段的橋架處于同一電位，而距離較長的橋架增加與保護導體的連接點是為了讓其處于地電位。

　　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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