1. Electrical connection: Outdoor primary wiring should be connected with hot-dip galvanized bolts. The bolts used should have flat washers and spring washers. After the bolts are tightened, the bolts should be exposed 2 to 3 buckles. One bolt with two flat washers, one spring washer and one nut. When installing, place a flat washer on the head side of the bolt, and place a flat washer and a spring washer on the nut side, where the spring washer rests on the nut.

2. Electrical equipment fixing category: transformers, distribution box bases and iron accessories are connected. For example, when using channel steel bevel bolts to connect and fix, one bolt is equipped with a nut, a bevel washer (for channel steel bevel side) and a flat washer (flat surface). 2 side use). When using channel steel flat bolts to connect and fix, one bolt is equipped with two flat washers, one spring washer and one nut. When installing, place a flat washer on the head side of the bolt, and place a flat washer and a spring washer on the nut side, where the spring washer rests on the nut. The connection between the isolating switch, drop-out fuse, arrester and iron accessories, in principle, use the mounting bolts provided by the equipment manufacturer.

3. Fixing iron accessories: when the connecting bolt holes of iron accessories are round holes, one bolt is equipped with one nut and two flat washers; when the connecting bolt holes of iron accessories are long holes, one bolt is equipped with one nut and two square washers , place a flat washer (square washer) on the bolt head side and the nut side during installation. When stud bolts are used for the connection of iron accessories, each end of the bolt shall be equipped with a nut and a flat washer (square washer). For the bolt connection of the inclined surface on the channel steel and the I-beam flange, try to use the inclined washer so that the bearing surface of the nut and the head of the bolt is perpendicular to the screw rod.