South cable Productive Wdzb1-byj-105-450 / 750V, heat resistance 105 ℃, halogen-free low smoke flame retardant B1 grade cross-linked polyolefin Insulated cable It has passed the type inspection (safety performance) test by the national fire protection building material quality supervision and inspection center, According to the "national new building regulations" and "provincial new construction project", it is applicable to high-rise buildings and key government departments /The main lines of fire control places such as industrial / medical / educational / ancient buildings, crowded places / underground / semi underground shopping malls, etc. are in accordance with the Mandatory requirements Class B1 cables.