How to calculate cable sizes in sq.mm. with using motor KW?
Any formula there?
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Answer Posted / abid
Normally for the circuit breaker calculation we multiply our motor's current into 125% for example if a motor 5HP operates in 8amps we multiply8*125%(10) so the breaker size will be 8+10 18amps or 20 amps.
and for the cable size we multiply breakers amp*1.5
=27
so for 5hp 3ph motor suitable breaker is 20amps
and the suitable cable 4sqmm
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