1.Dense cable Multiple dense configuration of the flame resistance of the cable, should be in accordance with the "bundle of wires and cables combustion test method", as well as the cable configuration, the need to prevent catastrophic accidents and the principle of economic rationality, to meet the requirements of the appropriate category.
1.Dense cable
Multiple dense configuration of the flame resistance of the cable, should be in accordance with the "bundle of wires and cables combustion test method", as well as the cable configuration, the need to prevent catastrophic accidents and the principle of economic rationality, to meet the requirements of the appropriate category.
In the role of external fire for a certain period of time to maintain the power of the following places or circuits, open cable should be implemented fire protection or fire-resistant cable selection. Such as fire, alarm, emergency lighting, blocker operation of DC power and generator set emergency shutdown of the preservation of power and other important circuits; computer monitoring, dual relay protection, security power supply and other dual circuits together with the same channel is not isolated from each other when one of the circuits.
2. Open cable implementation of fire-resistant protection methods
When the number of cables is small, available fire-resistant paint, wrapping tape added to the cable or the cable through the fire-resistant pipe. More cables in the same channel, it is appropriate to lay in the fire-resistant slot box, and the power cable should be used breathable type, in the environment without flammable dust can be used semi-closed, laid on the bridge cable protection section is not long, you can also use fire-resistant package.
In the tank farms, important wooden public buildings, high-temperature places and other fire-resistant requirements and laying installation and economic performance acceptance of the situation, non-combustible mineral insulated cables can be used. Self-capacitating oil-filled cables laid in the open in the public corridors, passenger tunnels, bridges and other requirements for the implementation of fire treatment, can be taken to bury sand laying. Close to the high-voltage current, voltage transformers and other oil-containing equipment cable trench, it is appropriate to make the section of the trench cover plate sealing.
3. Dense places
In the high security requirements of the cable in dense places or closed channels, should be equipped with a reliable action for the environment of the automatic fire detection and alarm devices. Laying of oil-filled cable oil supply system, there should be able to reflect the state of oil injection of automatic fire alarm and locking device. Underground utilities cable-intensive parts of the terminal settings of the oil-filled cables back to the high security requirements of the place, can be equipped with water spray extinguishing and other specialized fire-fighting facilities.