The materials used between each kind of wire and cable are different, which also creates different uses of wire and cable. ZMS cable small take you to understand the choice of cable insulation materials.
Ordinary Wire and Cable
1. The applicable temperature range of ordinary PVC wire and cable is -15℃~60℃.
When the ambient temperature of the use site exceeds this range, special PVC wire and cable should be used.
Ordinary PVC wire and cable emits toxic fumes when it burns.
Therefore, it is not suitable for underground passenger facilities, underground commercial areas, high-rise buildings and important public facilities and other crowded places.
2. Cross-linked polyvinyl chloride (XLPE) wire and cable does not have flame retardant properties, but does not produce large amounts of toxic fumes when burning.
It is suitable for industrial and civil buildings with "clean" requirements.
3. Rubber wire and cable has better bending performance and can be laid in cold climate.
It is suitable for places with large horizontal height difference and vertical laying.
Rubber wire and cable is suitable for the power supply line of mobile electrical equipment.
Flame retardant wire and cable flame retardant cable is the specified test conditions are burned, can make the flame spread only within the limits.
After the removal of the fire source, the residual flame and residual burn can be extinguished in a limited period of time on their own cable flame retardant cable performance is mainly assessed by the oxygen index and smoke two indicators.
Since the oxygen content in the air accounts for 21%, materials with an oxygen index greater than 21 will automatically self-extinguish in the air.
Therefore, the higher the oxygen index of the material, the better its flame retardancy.
Flame-retardant cables can be divided into three categories: general flame-retardant cables, low-smoke and low-halogen flame-retardant cables and halogen-free and low-smoke flame-retardant cables, according to the characteristics of the smoke produced when they burn.
Directly buried underground cables
Directly buried in the building pipeline cable
Through the pipe, laying wire and cable.
These can be used for ordinary type wire and cable.
Laid in a covered slot box, cable trench with a cover cable.
If you have taken blocking, water blocking, isolation and other measures to prevent prolonged combustion, can reduce the level of flame retardant requirements.
Flame-Resistant Wire and Cable
1. Fire-resistant wire and cable refers to the specified test conditions, in the flame was burned for a certain period of time to maintain normal operating characteristics of the cable.
2. Fire-resistant cable can be divided into two types of insulation material, with type and without type.
Organic type insulation fire-resistant type cable mainly uses mica tape that can withstand 800 degrees of heat with a 50 percent overlap rate wrapped in two layers as a fire-resistant layer.
Polyvinyl chloride or cross-linked polyethylene is used for the outer insulation.
If flame retardancy is also required, it is sufficient to use flame retardant materials for the insulation.
Organic fire-resistant cables can withstand temperatures up to 950 degrees Celsius with the addition of an oxygen barrier.
No type is mineral insulated cable.
3. Fire-resistant wire and cable is mainly used for lines that need to maintain normal operation in case of fire.
4. The fire resistance level should be determined according to the flame temperature that may be reached in case of fire.
The above content is for you to briefly share some knowledge about how wire and cable should choose its insulation material, I hope it will be helpful to you. Generally, when choosing to use the cable, safety must be the first. ZMS cable supplier is committed to producing good cable for everyone to choose, always adhere to the quality products and refine service.
