Selection criteria for bolt-type tension clamps in insulated conductor lines

In densely populated, tree-filled, and polluted areas, we are increasingly using insulated wires to replace bare wires. Compared with bare wires, it has the advantages of high safety and reliability, reduced line loss, and less wire corrosion. When using insulated wires, we need to pay attention to the fact that since bolted type strain clamp is clamped on the outer diameter of the "wire" rather than the outer diameter of the "conductor" when used, the dead end strain clamp model used should be selected based on the outer diameter of the wire rather than the outer diameter of the conductor. For example, in the power line, a steel core reinforced cross-linked polyethylene insulated overhead cable is used. After calculation, it is known that its conductor outer diameter is 15.30mm, plus its insulation thickness of 3.4mm and conductor shielding thickness of 0.5mm, it can be known that its conductor outer diameter is 23.1 mm, and the bolted dead end clamp model it should use is NLL-5.