Let's take a look at the requirements of the code for acceptance of construction quality of Building Electrical Engineering (gb50303):

電纜敷設(shè)不得存在絞擰、鎧裝壓扁、護(hù)層斷裂和表面嚴(yán)重劃傷等缺陷。

The cable laying shall be free from defects such as twisting, flattening of armor, breakage of protective layer and serious scratch on the surface.

電纜敷設(shè)應(yīng)符合下列規(guī)定：

Cable laying shall comply with the following provisions:

電纜敷設(shè)排列應(yīng)順直、整齊，并宜少交叉。

The cables shall be laid and arranged in a straight and orderly manner with less crossing.

電纜轉(zhuǎn)彎處的小彎曲半徑應(yīng)符合表11.1.2的規(guī)定。

The minimum bending radius at the cable turning shall comply with the provisions in table 11.1.2.

在電纜溝或電氣豎井內(nèi)垂直敷設(shè)或大于45°傾斜敷設(shè)的電纜應(yīng)在每個(gè)支架上固定。

Cables laid vertically or more than 45 ° obliquely in cable trench or electrical shaft shall be fixed on each support.

在梯架、托盤(pán)或槽盒內(nèi)大于45°傾斜敷設(shè)的電纜每隔2m固定，水平敷設(shè)的電纜，首尾兩端、轉(zhuǎn)彎兩側(cè)及每隔5m~10m處應(yīng)設(shè)固定點(diǎn)。

Cables laid obliquely at an angle greater than 45 ° in ladders, trays or trough boxes shall be fixed every 2m. For cables laid horizontally, fixed points shall be set at both ends, both sides of turns and every 5m ~ 10m.

電纜出入電纜溝、電氣豎井、建筑物，配電（控制）柜、臺(tái)、箱處以及管子管口處等部位應(yīng)采取防火或密封措施。

Fire prevention or sealing measures shall be taken at the places where cables enter and exit cable trenches, electrical shafts, buildings, distribution (control) cabinets, platforms, boxes and pipe orifices.

電纜的首端、末端和分支處應(yīng)設(shè)標(biāo)志牌，直埋電纜應(yīng)設(shè)標(biāo)示樁。

Signboards shall be set at the head, end and branch of cables, and signposts shall be set for directly buried cables.

電纜敷設(shè)前做絕緣遙測(cè)，低壓采用1KV絕緣搖表遙測(cè)線間及對(duì)地絕緣電阻值不低于10MΩ，并做好記錄。

Insulation telemetry shall be conducted before cable laying. 1kV insulation megger shall be used for low voltage telemetry. The insulation resistance between lines and to ground shall not be less than 10m Ω, and records shall be made.

電纜沿橋架或者托盤(pán)敷設(shè)時(shí)，應(yīng)將電纜單層敷設(shè)，排列整齊。不得有交叉，拐彎處應(yīng)以大截面積電纜允許彎曲半徑為準(zhǔn)。

When the cable is laid along the bridge or tray, the cable shall be laid in a single layer and arranged neatly. There shall be no crossing, and the bend shall be subject to the allowable bending radius of the cable with the maximum cross-sectional area.

電纜敷設(shè)排列整齊，水平敷設(shè)的電纜，首尾兩端、轉(zhuǎn)彎兩側(cè)及每隔5~10米處設(shè)固定點(diǎn)。微信公眾號(hào)：建筑水電知識(shí)平臺(tái)敷設(shè)于垂直橋架內(nèi)的電纜，每敷設(shè)一根應(yīng)固定一根，固定點(diǎn)間距不大于如下數(shù)值：全塑型電纜和控制電纜固定點(diǎn)間距不大于1米， 其他電力電纜不大于1.5米。

The cables shall be laid in order, and fixed points shall be set at both ends of the horizontal cable, both sides of the turn and every 5 ~ 10m. The official account of WeChat: the cable for building hydropower knowledge platform is laid in the vertical bridge. Each laying shall be fixed one, and the spacing between fixed points is not greater than the following values: the spacing between fixed points of all plastic cables and control cables is not more than 1 meters, and other power cables are not more than 1.5 meters.

電纜總截面積與托盤(pán)和梯架橫斷面面積之比，電力電纜不應(yīng)大于40%，控制電纜不應(yīng)大于50%。

The ratio of the total cross-sectional area of cables to the cross-sectional area of trays and ladders shall not be greater than 40% for power cables and 50% for control cables.

沿電纜橋架敷設(shè)的電纜在其兩端、拐彎處、交叉處應(yīng)掛電纜標(biāo)志牌，標(biāo)志牌上應(yīng)注明電纜編號(hào)、規(guī)格、電壓等級(jí)及起始位置。

Cable signs shall be hung at both ends, corners and intersections of cables laid along the cable tray, and the cable number, specification, voltage grade and starting position shall be indicated on the signs.

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