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Online Wire Size Calculators & Tables - 3 phase motor amps calculator
If we make the connection of electricity, then one thing comes to mind that how many mm2 of cable will have to be used to connect the meter to the pole. To answer this, first, the rating of the cable depends on how many kW of load the connection will be connected to the meter.
If the connection is of domestic mode or commercial mode and the load is 5 kw then a single phase 2 core PVC cable will be used and if the connection is in 3 phase motor or industrial mode then 3 or 4 core 3 phase PVC cable will be used.
The full form of PVC is Polyvinyl Chloride and as we know that PVC is a thermoplastic polymer chemical material, the polymeric property of PVC provides stability to the cable at high and low temperatures and the insulation of the cable is the same in both cases.
The polymeric property of PVC helps prevent degradation where protection against UV light is required.
PVC cable is used primarily on locations that require minimum corona effect resistance, and low and medium-voltage motor or electrical equipment, and low-frequency insulation. PVC Cable is available at low cost and also has excellent aging properties and this cable can be easily used for 25 to 30 years. That is, in the case of the HT motor, the short circuit current capacity of the cable plays a major role in determining the size of the cable. So in the case of HT motor, cable short circuit current capability solely is sufficient to finalize the cable size, as the other two parameters will be adjusted automatically.
But, The rating of the PVC cable also depends on many other factors, which increase the current rating capacity of the cable and derate the cable. In the case of copper wire PVC cable derating factor due to the above three causes would be 1. Now in actual if we look at the chart given below then a 95 mm2 PVC cable would be perfect to use for connecting the motor to the supply point. If we calculate the current capacity of the motor or get the current capacity from the name plate of the motor, then through the cable size chart given below, we can get the size of the cable mm2.
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