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how we can calculate cable size of 230v,1 hp single phase
motor ? panel to motor distance is 25 meter
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Answer Posted / vipin
kamal is right ,after deciding the load current you ll have to consider the starting condition....
as per the IEEE regulations you ll have to consider 3 to 4 times the rated current as the starting current...as the rated current is coming around 6 amperes you can select a CB of 20A DP or SP. A 4sqmm cable will be std for the 1 hp pump.. you will have to verify with your supply company rules for the size of cable to be used for the designed value of circuit breaker.
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Is a contactor (or master relay) required between incoming lines and a VFD? The question goes to safety. If a contactor were used before the VFD and an e-stop engaged then the motor will coast to a stop (i.e. VFD loses power) instead of stopping much faster if the VFD braking fucntion were used. It would make more sense to keep power on the VFD.
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