Designers should select and lay flame-retardant cables based on their specific characteristics, and pay attention to the following issues:
(1) Due to the release of corrosive halogenated acid gas during combustion of halogenated flame-retardant cables (including flame-retardant cables and low halogen low smoke flame-retardant cables), which greatly hinders firefighting work, delays firefighting time, and intensifies fire spread, halogen-free low smoke flame-retardant cables should be designed and selected as much as possible in public places with high population density. In work areas with low population density, any type of flame-retardant cable can be selected.
(2) Flame retardant cables are divided into Class A, B, and C3, with Class A having better performance and the most expensive price compared to Class B and C. Designers should indicate the category of flame-retardant cables when providing an order list.
(3) It is not possible to distinguish the A, B, and C categories of flame-retardant cables from their appearance, and only the manufacturer can provide supply assurance. Therefore, cable manufacturers should be carefully selected in design and selection.
(4) Compared with halogen-containing flame-retardant cables, halogen-free low smoke flame-retardant cables have the advantages of low corrosion and low smoke, but their electrical and mechanical properties are significantly reduced. Therefore, when laying cables, halogen-free low smoke flame-retardant cables should have a larger bending radius than halogen-containing flame-retardant cables.
(5) When designing cable laying, it is not advisable to lay non flame retardant cables and flame retardant cables side by side, and flame retardant cables of different flame retardant categories should not be laid side by side.
