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

电缆敷设不得存在绞拧、铠装压扁、护层断裂和表面严重划伤等缺陷。

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

电缆敷设应符合下列规定：

Cable laying shall comply with the following provisions:

电缆敷设排列应顺直、整齐，并宜少交叉。

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

电缆转弯处的小弯曲半径应符合表11.1.2的规定。

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

在电缆沟或电气竖井内垂直敷设或大于45°倾斜敷设的电缆应在每个支架上固定。

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

在梯架、托盘或槽盒内大于45°倾斜敷设的电缆每隔2m固定，水平敷设的电缆，首尾两端、转弯两侧及每隔5m~10m处应设固定点。

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.

电缆出入电缆沟、电气竖井、建筑物，配电（控制）柜、台、箱处以及管子管口处等部位应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.

电缆的首端、末端和分支处应设标志牌，直埋电缆应设标示桩。

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

电缆敷设前做绝缘遥测，低压采用1KV绝缘摇表遥测线间及对地绝缘电阻值不低于10MΩ，并做好记录。

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.

电缆沿桥架或者托盘敷设时，应将电缆单层敷设，排列整齐。不得有交叉，拐弯处应以大截面积电缆允许弯曲半径为准。

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.

电缆敷设排列整齐，水平敷设的电缆，首尾两端、转弯两侧及每隔5~10米处设固定点。微信公众号：建筑水电知识平台敷设于垂直桥架内的电缆，每敷设一根应固定一根，固定点间距不大于如下数值：全塑型电缆和控制电缆固定点间距不大于1米， 其他电力电缆不大于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.

电缆总截面积与托盘和梯架横断面面积之比，电力电缆不应大于40%，控制电缆不应大于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.

沿电缆桥架敷设的电缆在其两端、拐弯处、交叉处应挂电缆标志牌，标志牌上应注明电缆编号、规格、电压等级及起始位置。

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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