| 摘要 |
<p>The conductor (L) has two layers arranged above a central core (1) with a set of conductive wires that are twisted around the core in two layers. The wires of one of the layers are steel wires (3) with an ultimate tensile strength between 800 and 2200 Newton per square milli meter (N/mm2). The wires of the other layer are copper wires (5) with an ultimate tensile strength between 250 and 400 N/mm2, where the length of the copper wires is between 8 and 18 times of diameter of the conductor over the steel wires. The copper wires and the core are tinned, silver-plated or nickel-plated.</p> |
