How to distinguish the quality of refractory cables
Release date: 2020-01-06 Views: 14
就教大家如何辨别耐火电缆的质量。 We know that the most common power system is wires and cables. The transmission of power communication signals depends on wires and cables. Good-quality cables have a long service life and are not prone to aging. Today Xutong will teach you how to distinguish the quality of refractory cables .
1. Look at the appearance: The insulation (sheath) layer of the qualified refractory cable is soft, flexible and flexible, and the surface layer is tight, smooth, without roughness, and has pure gloss. The surface of the insulation (sheath) layer should have clear and abrasion-resistant signs. For products made from non-standard insulation materials, the insulation layer feels transparent, brittle, and non-tough.
2. Look at the insulation layer: The national standard has the thinnest point for the uniformity of the insulation layer of the refractory cable, and the average thickness has clear data requirements. The regular wire insulation layer has a uniform thickness, is not eccentric, and is tightly packed on the conductor.
3. Look at the core: The refractory cable is made of pure copper raw materials and is strictly drawn, annealed (softened), and twisted. Its surface should be bright, smooth, burr-free, flat tightness, soft and tough, and not easy to break.
4. Look at the certificate: The standard fire-resistant cable certificate should indicate the manufacturer's name, address, after-sales service phone, model, specification structure, nominal cross-section (that is, usually 2.5 square, 4 square wires, etc.), and the rated voltage ( Single-core wire 450 / 750V, two-core protective sheath wire 300 / 500V), length (national standard stipulated length is 100M 0.5M), inspection employee number, manufacturing date, and the national standard number or certification mark of the product.