全長(zhǎng)大于30米的電纜橋架，中間增加與保護(hù)導(dǎo)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(yīng)牢固可靠，金屬電纜橋架與保護(hù)導(dǎo)體的連接應(yīng)符合下列規(guī)定:

　　1 電纜橋架全長(zhǎng)不大于30m時(shí)，不應(yīng)少于2處與保護(hù)導(dǎo)體可靠連接;全長(zhǎng)大于30m時(shí)，每隔20m~30m應(yīng)增加一個(gè)連接點(diǎn)起始端和終點(diǎn)端均應(yīng)可靠接地;

　　2 非鎖鋅電纜橋架本體之間連接板的兩端應(yīng)跨接保護(hù)聯(lián)結(jié)導(dǎo)體，保護(hù)聯(lián)結(jié)導(dǎo)體的截面面積應(yīng)符合設(shè)計(jì)要求:

　　鎖鋅電纜橋架本體之間不跨接保護(hù)聯(lián)結(jié)導(dǎo)體時(shí)，連接板每端不應(yīng)少于2個(gè)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(yè)如下：

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

　　當(dāng)橋架的總長(zhǎng)度a+b+c大于30米時(shí)，橋架每隔20~30米與就近的保護(hù)導(dǎo)體可靠連接。這個(gè)保護(hù)導(dǎo)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(gè)就近的保護(hù)導(dǎo)體如何得到呢？

　　But how can this nearby protective conductor be obtained?

　　這個(gè)保護(hù)導(dǎo)體可以是人為專門(mén)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(mén)敷設(shè)一根保護(hù)導(dǎo)體（通常是沿著橋架敷設(shè)一根熱鍍鋅扁鋼）才是簡(jiǎn)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(mén)敷設(shè)的一根保護(hù)導(dǎo)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(yīng)跨接保護(hù)聯(lián)結(jié)導(dǎo)體，保護(hù)聯(lián)結(jié)導(dǎo)體的截面面積應(yīng)符合設(shè)計(jì)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(hù)聯(lián)結(jié)導(dǎo)體時(shí)，連接板每端不應(yīng)少于2 個(gè)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(hù)聯(lián)接導(dǎo)體，他的作用和前面的長(zhǎng)度大于30米的橋架中間增加與保護(hù)導(dǎo)體的連接點(diǎn)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(zhǎng)的橋架增加與保護(hù)導(dǎo)體的連接點(diǎn)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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