The cables commonly used in factory power distribution are divided into power cables and control cables.
1. Power cables
1. Polyvinyl chloride insulated (PVC) power cable, copper core polyvinyl chloride insulated power cable (VV), aluminum core polyvinyl chloride insulated power cable (VLV), steel belt armored copper core polyvinyl chloride insulated power cable (VV22), steel belt armored aluminum core polyvinyl chloride insulated power cable (VLV22). The maximum long-term allowable operating temperature of the conductor is 70°C.
Because this type of cable produces toxic fumes when burned, its application is gradually reduced.
2. Cross-linked polyethylene insulated (XLPE) power cable, copper core cross-linked polyethylene insulated power cable (YJV), aluminum core cross-linked polyethylene insulated power cable (YJLV), steel belt armored copper core cross-linked polyethylene insulated power cable (YJV22), steel belt armored cross-linked polyethylene insulated power cable (YJLV22). The maximum long-term allowable operating temperature of the conductor is 90°C.
It has a high cost-effectiveness and is widely used in various projects. However, this power cable has no flame retardant properties and is sensitive to ultraviolet rays.
II. Control cable
1. Polyvinyl chloride insulated (PVC) control cable, copper core polyvinyl chloride insulated control cable (KVV), steel belt armored copper core polyvinyl chloride insulated control cable (KVV22).
2. Shielded control cable, copper core polyvinyl chloride insulated shielded control cable (KVVP), armored copper core polyvinyl chloride insulated shielded control cable (KVVP22).
3. The control cable leading to the automatic control PLC or DCS should use computer shielded control cable.
III. Frequency conversion cable
1. Frequency conversion power cable, cross-linked polyethylene insulated shielded inverter main cable (BPYJVP), mainly used for inverter circuit.
2. Frequency conversion control cable, polyvinyl chloride insulated shielded inverter control cable (BPKVVP), mainly used for signal transmission between inverter and power supply.
4. Fire-resistant cables
Fire-resistant cables (N or NH-) are generally used in lines that must remain in normal operation during fires, such as fire protection systems, life-saving systems, and high-temperature environments in industrial and civil buildings.
According to the temperature and duration of fire resistance, fire-resistant cables are divided into Class A, Class B, and Class C.
5. Flame-retardant cables
Flame-retardant cables (Z or ZR-) should have the ability to prevent or delay the occurrence or spread of flames.
According to factors such as the temperature and time of fire supply, flame-retardant cables are divided into Class A, Class B, Class C, and Class D.
6. Cable conductors
At present, the conductors of cables are generally copper cores, and the application of aluminum cores is becoming less and less.
