What is the difference between VV22 and VV62?
Copper core conductor PVC insulated PVC sheathed double steel tape wrapped armored type power cable copper conductor PVC insulated PVC sheathed non-magnetic metal armored power cable difference is the type of armor material
Cable flow current is to be hot, look at the table with a look at the current is normal, the current is consistent with the cable configuration. Laying the environment is normal.
The conductor of the cable is resistive, and the current when the cable is running through the conductor to heat up. In a certain installation, ambient temperature conditions, the heat generated by the conductor current and cable in the operating environment under the conditions of the heat dissipation is equal, when the current is safe operating current, which is commonly referred to as the cable carrying capacity. Cable carrying capacity is in a certain installation, ambient temperature conditions, the load, so the installation, the ambient temperature conditions are different, carrying capacity is different from the ambient temperature changes, the safe current is also to change. Therefore, if the cable is running at a certain installation and ambient temperature, if the actual carrying capacity of the cable exceeds the safe cut-off, the heat generated by the conductor is greater than the heat of the distribution, the cable will heat up; the same time when the ambient temperature increases The ability to heat down, if the current carrying capacity is not reduced, the cable is to heat.
Cross-linked power cable heating the main reason there are . the choice of continuous allowable current is less than the load of the maximum continuous current power cable; . the power cable in the implementation of the cable for cold contact, the use of crimping pliers die too large, leading to copper . the air switch input and output and cable copper nose connection, the choice of non-standard flat gasket or no spring gasket; . the air switch input and output side of the cable and cable core crimp is not solid and reliable; When the cable is connected to a strand, the air switch bolts are not tightened. . high-power UPS running, the filter cabinet is not put, n harmonic effects of cable overload, neutral overload, serious lead to cable breakdown, and a fire hazard. . the power cable along the building facade iron cabinet box laying, the surrounding environment is not ventilated, poor heat dissipation. Select the power cable should consider the following factors: . the rated voltage of the cable is greater than or equal to the rated power supply system power supply system; . the cable can continue to allow the current to be equal to or greater than the maximum load current load; . Power supply system short-circuit stability requirements; . according to the length of the cable to determine whether the voltage drop to meet the requirements; . the end of the line minimum short-circuit current should be able to protect the device reliable action. . a high degree of breakdown strength; . low dielectric loss; . a very high insulation resistance; . excellent resistance to discharge performance; . with a certain degree of flexibility and mechanical strength; . long-term stability of insulation.
