At present, with the continuous improvement of the level of science and technology, the flame retardant problem has been flame-retarded by the past halogens, and further developed to low-halogen, halogen-free flame-retardant. When Zhongli Technology Group Co., Ltd. develops and produces "flame-retardant and fire-retardant flexible cables for telecommunication power supply", halogen-free polymer materials with low smoke, halogen-free, high decomposition temperature, and good mechanical properties are used for the insulation and sheathing of cables. The cable does not contain halogenated compounds and metal oxides. It does not produce harmful gases and a lot of smoke when it is burned. There is no possibility that it will cause “secondary disasters.†It also has good mechanical and electrical properties and satisfies the cable. The use of requirements, completely changed the shortcomings of the previous flame-retardant cable.
use
1. The flammability of cables with densely packed multiple cables should be based on the "bundle wire and cable combustion test method", as well as the cable configuration, the need to prevent catastrophic accidents, and economical and reasonable principles to meet the applicable category requirements.
The following locations or circuits to be energized shall be maintained for a certain period of time during the action of an external fire. The cable of the surface coating shall be fire-resistant or be of a fire-resistant type. Such as fire protection, alarm, emergency lighting, interrupter operation of DC power supply and emergency shutdown of the generator set, such as the maintenance of important circuits; computer monitoring, dual relay protection, security power supply and other dual circuits when the same channel is not isolated when one of the loop.
2. When there is a small number of cables with fire-resistant protective cables, fire-retardant coatings, tapes can be added to the cables or the cables can be put in the refractory pipes. When there are many cables in the same channel, it should be laid in the fireproof trough box, and the power cable should use air-breathable type, semi-closed type can be used in the environment without flammable dust, and the cable protection section laid on the bridge is not long. Fire blocking package can be used.
In non-flammable mineral insulated cables, other refractory requirements such as tank farms, important wooden structures, public buildings, high-temperature locations, etc., and installation and economic performance are acceptable. Self-contained oil-filled cables can be buried in sand when they are applied to fire protection in public corridors, passenger tunnels, and bridges. Close to the cable trench of oil-containing equipment such as high-voltage current and voltage transformer, the section of the trench cover plate should be sealed.
3. Intensified places shall be equipped with automatic fire detection and alarm devices suitable for reliable operation of the environment in cable-intensive places or enclosed passages with high safety requirements. The oil supply system of the oil-filled cable for the Mingshi should be equipped with an automatic fire alarm and locking device that can reflect the state of fuel injection. Underground facilities, such as cable-dense parts, terminals with multiple oil-filled cable terminals, and other places with high safety requirements, may be equipped with special firefighting facilities such as water spray and fire extinguishing.
Flame retardant cable use matters needing attention
(1) In the same channel, it is not appropriate to arrange the non-flame-proof cable and the flame-retardant cable in parallel.
(2) The following places or circuits to be energized shall be maintained for a certain period of time in the event of an external fire. The cable shall be fire-resistant or shall be made of fire-resistant cable. Such as fire protection, alarm, emergency lighting, interrupter operation of DC power supply and emergency shutdown of the generator set, such as the maintenance of important circuits; computer monitoring, dual relay protection, security power supply and other dual circuits when the same channel is not isolated when one of the loop.
(3) When the number of cables is small, fire-retardant paints, tapes may be added to the cables or the cables may be put in the refractory pipes. When there are many cables in the same channel, it should be laid in the fireproof trough box, and the power cable should use air-breathable type, semi-closed type can be used in the environment without flammable dust, and the cable protection section laid on the bridge is not long. Fire blocking package can be used.
use
1. The flammability of cables with densely packed multiple cables should be based on the "bundle wire and cable combustion test method", as well as the cable configuration, the need to prevent catastrophic accidents, and economical and reasonable principles to meet the applicable category requirements.
The following locations or circuits to be energized shall be maintained for a certain period of time during the action of an external fire. The cable of the surface coating shall be fire-resistant or be of a fire-resistant type. Such as fire protection, alarm, emergency lighting, interrupter operation of DC power supply and emergency shutdown of the generator set, such as the maintenance of important circuits; computer monitoring, dual relay protection, security power supply and other dual circuits when the same channel is not isolated when one of the loop.
2. When there is a small number of cables with fire-resistant protective cables, fire-retardant coatings, tapes can be added to the cables or the cables can be put in the refractory pipes. When there are many cables in the same channel, it should be laid in the fireproof trough box, and the power cable should use air-breathable type, semi-closed type can be used in the environment without flammable dust, and the cable protection section laid on the bridge is not long. Fire blocking package can be used.
In non-flammable mineral insulated cables, other refractory requirements such as tank farms, important wooden structures, public buildings, high-temperature locations, etc., and installation and economic performance are acceptable. Self-contained oil-filled cables can be buried in sand when they are applied to fire protection in public corridors, passenger tunnels, and bridges. Close to the cable trench of oil-containing equipment such as high-voltage current and voltage transformer, the section of the trench cover plate should be sealed.
3. Intensified places shall be equipped with automatic fire detection and alarm devices suitable for reliable operation of the environment in cable-intensive places or enclosed passages with high safety requirements. The oil supply system of the oil-filled cable for the Mingshi should be equipped with an automatic fire alarm and locking device that can reflect the state of fuel injection. Underground facilities, such as cable-dense parts, terminals with multiple oil-filled cable terminals, and other places with high safety requirements, may be equipped with special firefighting facilities such as water spray and fire extinguishing.
Flame retardant cable use matters needing attention
(1) In the same channel, it is not appropriate to arrange the non-flame-proof cable and the flame-retardant cable in parallel.
(2) The following places or circuits to be energized shall be maintained for a certain period of time in the event of an external fire. The cable shall be fire-resistant or shall be made of fire-resistant cable. Such as fire protection, alarm, emergency lighting, interrupter operation of DC power supply and emergency shutdown of the generator set, such as the maintenance of important circuits; computer monitoring, dual relay protection, security power supply and other dual circuits when the same channel is not isolated when one of the loop.
(3) When the number of cables is small, fire-retardant paints, tapes may be added to the cables or the cables may be put in the refractory pipes. When there are many cables in the same channel, it should be laid in the fireproof trough box, and the power cable should use air-breathable type, semi-closed type can be used in the environment without flammable dust, and the cable protection section laid on the bridge is not long. Fire blocking package can be used.
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