Original Title: Illustration of Common Wires, Wire Connection Methods and Electrical Wire Connection Methods Wire connection is a basic process of electrical work, and it is also a very important process. The quality of conductor connection is directly related to whether the whole line can operate safely and reliably for a long time. The basic requirements for wire connection are: firm and reliable connection, small joint resistance, high mechanical strength, corrosion and oxidation resistance, and good electrical insulation performance. Different types of wires to be connected and different connection forms lead to different connection methods. Commonly used connection methods are twisted connection, compression connection, welding and so on. Before connection, carefully strip off the insulation layer at the connection part of the conductor, and pay attention not to damage the core wire. 1. Stranded connection Stranded connection refers to the direct and tight stranding of the core wires of the conductor to be connected. Copper conductors are often connected by stranding. (1) Direct connection of single copper conductor. The connection method of small-section single-strand copper conductor is as shown in Figure 1. First, cross the core wire ends of the two conductors in an X shape, then wind them for 2 to 3 circles, straighten the two wire ends, and then wind each wire end tightly on the other core wire for 5 to 6 circles, and then cut off the redundant wire ends. Fig. 1 The connection method of large-section single-strand copper conductors is as shown in Fig. 2. First, a core wire with the same diameter is filled in the overlapping part of the core wires of the two conductors, and then a bare copper wire with a section of about 1.5mm2 is tightly wound on it, the winding length is about 10 times the diameter of the conductor, and then the core wire ends of the connected conductors are folded back respectively. Continue to wind the bare copper wire at both ends for 5 to 6 circles, and then cut off the excess wire ends. Fig. 2 The connection method of single-strand copper conductors with different cross sections is as shown in Fig. 3. First, tightly wind the core wire of the thin conductor on the core wire of the thick conductor for 5 to 6 circles, and then fold back the thread head of the thick conductor core wire and press it tightly on the winding layer. Then, continue to wind the thin conductor core wire on it for 3 to 4 circles, and then cut off the redundant thread head. (2) Branch connection of single copper conductor. The T-shaped branch connection of the single-strand copper conductor is shown in Figure 4. Wrap the wire ends of the branch core wire tightly on the trunk core wire for 5 to 8 circles, and then cut off the redundant wire ends. For the core wire with a small cross section, first tie the thread end of the branch core wire on the trunk core wire with a loop knot, and then tightly wind it for 5 to 8 circles, and then cut off the excess thread end. Expand the full text Fig. 4 Cross branch connection of single-strand copper conductor As shown in Fig. 5,titanium exhaust tubing, tightly wind the wire ends of the upper and lower branch core wires on the trunk core wire for 5 to 8 circles, and then cut off the redundant wire ends. The wire ends of the upper and lower branch core wires may be wound in one direction [see fig. 5 (a)] or in both left and right directions [see fig. 5 (B)]. Fig. 5 (3) Direct connection of stranded copper conductors. The direct connection of multi-strand copper conductor is shown in Figure 6. Firstly, straighten the multi-strand core wire with the insulation layer stripped, twist and tighten about 1/3 of the core wire close to the insulation layer, and spread the remaining 2/3 of the core wire in an umbrella shape. The core wire of another conductor to be connected is also treated in this way. Then the two umbrella-shaped core wires are inserted into each other oppositely and then the core wires are kneaded, and then the thread ends of the core wires on each side are divided into three groups, wherein the thread ends of the first group on one side are firstly warped and tightly wound on the core wire, then the thread heads of the second group are warped and tightly wound on the core wire, and finally the thread heads of the third group are warped and tightly wrapped on the cores. Wrap the thread ends on the other side in the same way. Fig. 6 (4) Branch connection of multi-strand copper conductor. There are two methods for T-shaped branch connection of multi-strand copper conductor. One method is as shown in Figure 7. The branch core wire is bent by 90 ° and then parallel to the trunk core wire [see Figure 7 (a)], and then the wire end is folded back and tightly wound on the core wire [see Figure 7 (B)]. Fig. 7 Another method is as shown in Fig. 8. Twist and tighten about 1/8 core wires of the branch core wires close to the insulation layer, and divide the remaining 7/8 core wires into two groups [see Fig. 8 (a)]. One group is inserted into the trunk core wires,titanium plate gr7, and the other group is placed in front of the trunk core wires, and wound 4 to 5 turns to the right in the direction shown in Fig. 8 (B). Then, wind the group inserted into the core wires of the trunk for 4 to 5 turns toward the left in the direction shown in Fig. 8 (C), and the connected wires are shown in Fig. 8 (d). Fig. 8 (5) Connection of single-strand copper conductor and multi-strand copper conductor. The connection method of the single-strand copper conductor and the multi-strand copper conductor is shown in Figure 9. First, twist the core wire of the multi-strand conductor into a single-strand shape, and then tightly wind it on the core wire of the single-strand conductor for 5 to 8 circles. Finally, fold back the end of the single-stranded core wire and press it on the winding position. (6) Connection of wires in the same direction. When the wires to be connected are from the same direction, the method shown in fig. 10 can be used. For a single-strand conductor, the core wire of one conductor can be tightly wound on the core wires of other conductors, and then the thread ends of the other core wires are folded back and pressed tightly. For multi-strand conductors, the cores of two conductors can be crossed with each other and then twisted and tightened. For the connection of a single-strand wire and a multi-strand wire, the core wire of the multi-strand wire can be tightly wound on the core wire of the single-strand wire, and then the thread end of the single-strand core wire is folded back and compacted. Figure 9 Fig. 10 (7) Connection of two-core or multi-core wires and cables. During the connection of double-core sheathed wires, three-core sheathed wires or cables and multi-core cables, the connection points of each core wire shall be staggered as far as possible to better prevent electric leakage or short circuit between wires. Fig. 11 (a) shows the connection of the two-core sheathed cable, Fig. 11 (B) shows the connection of the three-core sheathed cable, and Fig 11 (C) show