Classification requirements for bolt location

根据配电线路螺栓使用位置及功能，螺栓可分为：电气连接类、电气设备固定类、铁附件固定类三种。下面具体说明：

According to the location and function of distribution line bolts, bolts can be divided into three categories: electrical connection, electrical equipment fixation, and iron accessories fixation. The following details:

1.电气连接类：户外一次接线应采用热镀锌螺栓连接，所用螺栓应有平垫圈和弹簧垫圈，螺栓紧固后，螺栓宜露出2～3扣。一根螺栓配两个平垫圈、一个弹簧垫圈、一个螺母。安装时螺栓头侧放置一个平垫圈，螺母侧放置一个平垫圈和一个弹簧垫圈，其中弹簧垫圈靠螺母。

1. Electrical connection: the outdoor primary wiring shall be connected with hot-dip galvanized bolts. The bolts used shall have flat washers and spring washers. After the bolts are fastened, the bolts should be exposed for 2-3 buckles. One bolt is equipped with two flat washers, one spring washer and one nut. During installation, a flat washer is placed on the bolt head side, and a flat washer and a spring washer are placed on the nut side, where the spring washer depends on the nut.

2.电气设备固定类：变压器、配电箱底座与铁附件连接如利用槽钢斜面螺栓连接固定时，一根螺栓配一个螺母、一个斜垫圈（槽钢斜面侧用）和一个平垫圈（平面2侧用）。利用槽钢平面螺栓连接固定时，一根螺栓配两个平垫圈、一个弹簧垫圈、一个螺母。安装时螺栓头侧放置一个平垫圈，螺母侧放置一个平垫圈和一个弹簧垫圈，其中弹簧垫圈靠螺母。隔离开关、跌落式熔断器、避雷器与铁附件的连接，原则上使用设备厂家提供的安装螺栓。

2. Fixation of electrical equipment: when the transformer, distribution box base and iron accessories are connected and fixed by channel steel bevel bolt, one bolt is equipped with a nut, a bevel washer (for channel steel bevel side) and a flat washer (for plane 2 side). When the channel steel plane bolt is used for connection and fixation, one bolt is equipped with two flat washers, one spring washer and one nut. During installation, a flat washer is placed on the bolt head side, and a flat washer and a spring washer are placed on the nut side, where the spring washer depends on the nut. In principle, the installation bolts provided by the equipment manufacturer shall be used for the connection of disconnectors, drop fuses, lightning arresters and iron accessories.

3.铁附件固定类：铁附件连接螺栓孔为圆孔时，一根螺栓配一个螺母、两个平垫圈，铁附件连接螺栓孔为长孔时，一根螺栓配一个螺母、两个方形垫圈，安装时螺栓头侧和螺母侧各放置一个平垫圈（方形垫圈）。铁附件连接采用双头螺栓时，螺栓每端各配一个螺母、一个平垫圈（方形垫圈）。对于槽钢和工字钢翼缘上倾斜面的螺栓连接，则尽量使用斜垫圈，使螺母和螺栓头部的支承面垂直于螺杆。

3. Fixation of iron accessories: when the connecting bolt hole of iron accessories is round hole, one bolt is equipped with a nut and two flat washers; when the connecting bolt hole of iron accessories is long hole, one bolt is equipped with a nut and two square washers. During installation, a flat washer (square washer) is placed on the bolt head side and the nut side respectively. When stud bolts are used for connection of iron accessories, each end of the bolt shall be equipped with a nut and a flat washer (square washer). For the bolted connection of the inclined plane on the flange of the channel steel and I-steel, the inclined washer shall be used as far as possible to make the bearing surface of the nut and bolt head perpendicular to the screw.

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