What common characteristics do mineral insulated cables possess?
Mineral insulated cables primarily possess the following three common characteristics:
■ Ultra-high fire resistance and fire resistance. They comply with the British BS6387 CWZ grade and meet the fire protection requirements of special and first-class buildings. This means they provide 180 minutes of uninterrupted power supply under fire conditions and are resistant to spray and impact.
■ High current carrying capacity. Generally, compared to PVC cables of the same cross-section, under the same operating conditions, the current carrying capacity is one to two cross-section grades higher.
■ Long service life. Conventional PVC cables typically have a service life of 20-40 years, while mineral insulated cables have a service life of 60-100 years.
In addition, the industry generally requires that the use of organic matter in mineral insulated cables be minimized, typically limiting the proportion of organic matter to no more than 5%. This is because, regardless of the physical or chemical treatment used, organic matter has limitations in terms of flame resistance, high temperature resistance, electrical durability, and aging resistance. In theory, in a stable structure, the lower the proportion of inorganic matter, the better the cable's performance.
