Which cable to choose for connecting an induction motor?
Good afternoon! A 37 m long cable is required for a 37 kW induction motor (heavy start). What brand and cross section is the cable suitable for? And what 5 or 6 magnitude starter (frog) is needed?
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Hello, the current in the three-phase network 380 V will be approximately 90 A. For a more accurate calculation, it is necessary to take into account the efficiency of the electric motor and cos phi, which are indicated in the motor certificate. I took the average values of these parameters. If the cable will not be subjected to mechanical stress, then a cable of the VVGng brand is suitable. For such a current, in your case, a three-core copper cable with a cross-section of conductors of 50 square meters is suitable. mm But it is not known how difficult the start is, therefore a voltage drop is possible with such a cross section - ideally, if it were possible to measure the voltage drop on the motor at the time of start-up with a cable of 50 sq. mm and if it is significant, then you should take a larger cross section - 70 square meters. mm If this is not possible, then it is better to immediately take a cable with a cross section of 70 square meters. mm The starter must take 6 quantities.