1. The equipment shell shall be flat, tight and beautiful, and shall not be deformed or corroded for 30 years.

2·主构架采用2mm 厚覆铝锌钢板， 内部安装灵活方便，主构架装配形式设计为全组装式结构。柜体构架及金属结构件均应有足够钢性及承载能力，能满足电气元件的安装要求及操作和短路时所产生的机械应力和热应力电动力，同时不因成套设备的吊装、运输等情况而损坏或影响开关柜及所安装元件的性能，柜内支架并可自由调节。

2. The main frame adopts 2mm thick aluminum zinc coated steel plate, with flexible and convenient internal installation. The assembly form of the main frame is designed as a fully assembled structure. The cabinet frame and metal structural parts shall have sufficient rigidity and bearing capacity to meet the installation requirements of electrical components and the mechanical stress, thermal stress and electric power generated during operation and short circuit. At the same time, the performance of the switchgear and installed components will not be damaged or affected due to the hoisting and transportation of the complete set of equipment. The support in the cabinet can be adjusted freely.

3·低压2500A 及以上进线、分段柜绝缘件安装粱采用2mm不锈钢，其余安装粱均采用2mm 抗腐蚀敷铝锌钢板，采用双重折边工艺。

3. 2mm stainless steel is used for the installation beam of insulation parts of low-voltage 2500A and above incoming line and section cabinet, and 2mm corrosion-resistant aluminum zinc coated steel plate is used for other installation beams, using double folding process.

4·柜体材料采用厚度不小于 2mm 的覆铝锌钢板、 镀锌板或冷轧钢板并喷塑,颜色采用RAL7035,柜体防护等级不小于 IP30。 地板和墙壁均不能作为壳体的一部分，柜底采用敷铝锌板封闭， 电缆孔带变径胶圈， 电缆由下部引入， 电缆室应有足够的空间以便安装电缆。

4. The cabinet body is made of aluminum zinc coated steel plate, galvanized steel plate or cold rolled steel plate with a thickness of not less than 2mm and sprayed with plastic. The color is ral7035, and the protection grade of the cabinet body is not less than IP30. The floor and wall cannot be used as a part of the shell. The bottom of the cabinet is closed with aluminum zinc coated plate, the cable hole is equipped with reducing rubber ring, the cable is introduced from the lower part, and the cable room should have enough space for the installation of cables.

5·柜内的母线和分支接线须用T2 铜材， 并应满足以下要求：

5. The bus and branch wiring in the cabinet must be made of T2 copper and meet the following requirements:

a·母线连接采用高强度专用螺栓连接， 接触面应镀锡， 应有足够和持久接触压力。

A. the bus connection adopts high-strength special bolt connection, the contact surface shall be tinned, and there shall be sufficient and lasting contact pressure.

b·母线的震动和温度变化在母线上产生的膨胀和收缩不致影响母线连接部位的接触特性。

B. the expansion and contraction of the bus caused by the vibration and temperature change of the bus will not affect the contact characteristics of the bus connection.

c·母线固定应选用不饱合增强树脂（SMC） 为材质制做的专用绝缘支撑件，以保证母线之间和母线与其它部件之间的距离和绝缘强度。    母线的布置和连接及绝缘支撑件应能承受装置额定短时耐受电流和额定峰值耐受电流所产生的热应力和电动力的冲击。

The insulation between the busbar and other parts (SMC) shall be reinforced by the insulating material between the busbar and other parts. The arrangement and connection of bus bars and insulating supports shall be able to withstand the impact of thermal stress and electric force generated by the rated short-time withstand current and rated peak withstand current of the device.

d·母线穿过金属隔板之外，应设计绝缘强度、机械强度符合要求、且安装简单而又牢固、可靠的绝缘套管和其它绝缘件。每台柜内母线相对独立， 适于现场安装， 柜间母线连接设计有专用的连接板。

D. except that the bus passes through the metal partition, insulating sleeves and other insulating parts with insulation strength and mechanical strength meeting the requirements and simple, firm and reliable installation shall be designed. The bus in each cabinet is relatively independent and suitable for on-site installation. The bus connection between cabinets is designed with special connecting plate.

e·母线及馈出均绝缘封闭，并具有检修时能可靠验电、接地的功能，保障检修人员的人身。

E. the bus and feed out are insulated and closed, and have the functions of reliable power inspection and grounding during maintenance, so as to ensure the personal safety of maintenance personnel.

f·铜排其折弯应无砸痕、裂口、毛刺，符合 DL/T 499 的规定。

F. the bending of copper bar shall be free of smashing marks, cracks and burrs, which shall comply with the provisions of DL / T 499.

g·导体、主母线及支线均采用矩形母线， 并采用不同相色热缩套管做绝缘处理。热缩套管不得开裂和起皱， 母线接头处用热缩绝缘盒封闭。 绝缘热缩护套材料应具备阻燃、 防腐、 抗老化的要求， 老化寿命不小于 30 年， 具体试验方法和要求参照 GB/T 2951.14 中规定执行。

G. rectangular bus shall be used for conductor, main bus and branch line, and heat shrinkable sleeves of different phase colors shall be used for insulation treatment. The heat shrinkable sleeve shall not crack or wrinkle, and the bus joint shall be closed with heat shrinkable insulating box. Insulation shrinkable sheath material should have flame retardant, anti-corrosion, anti-aging requirements, aging life is not less than 30 years, the specific test methods and requirements in accordance with the provisions of GB/T 2951.14.

h·导体须满足额定短时和峰值耐受电流的要求。 N 相（L0） 母线与三相母线规格相同,PE排截面不低于相排截面的 1/2。

H. the conductor must meet the requirements of rated short-time and peak withstand current. The specification of n-phase (L0) bus is the same as that of three-phase bus, and the section of PE bar is not less than 1 / 2 of that of phase bar.

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