| 摘要 |
<p>To enhance production efficiency and workability. An insulation sheath (40) is formed around a bundle formed by three-stranding one heating wire (10), one return wire (20) and one detection wire (30) to produce a rounded sectional profile shape as a whole, opposite-direction, same-level currents are respectively allowed to run through the heating wire (10) and the return wire (20) to limit electromagnetic wave leakage, and the detection wire (30) detects an abnormal condition. Stranding at least three wires can eliminate conventional steps arranged in series to enhance a production efficiency. In addition, an overall sectional profile closer to a circle than before can improve workability.</p> |
