What is a fireproof cable tray?

Fireproof cable bridges are installed in fireproof areas on the same floor, or cable shafts across different floors, or underground garages, which are generally used to protect the power cables and signal cables of fire-fighting equipment. It is often used in the distribution lines of fire-fighting equipment.
According to the production material, fireproof Cable Ladder Tray Manufacturers is divided into steel metal fireproof cable tray and non-metal fireproof cable tray. Steel metal fireproof cable tray is generally made of galvanized plate and galvanized cable tray. Then it is treated by fireproof spraying process.
Non-metallic fireproof cable bridges are generally made directly from fireproof and flame retardant polymer materials.
After a fire, the fireproof cable tray can be divided into different fire grades according to the length of normal working time of the cables in the tray, the time of grade NI is greater than or equal to 1 hour, the time of level NII is greater than or equal to 45 minutes, and the time of level NIII is greater than or equal to 30 minutes.