Re: calculations of 3-phase motors and sizes of wires to be used, including respective breakers in every motor

[admin]

Hi,

 

P(kW) =  HP x 0.746

 

 I = P *10^3 / (1,73*400*0,8)

 

P=5,6 kW  =>  I=10, A  ;  wire 2,5 mm2, Circuit breaker In=10A

P=7,5 kW =>   I=13,5 A ;  wire 2,5 mm2, Circuit breaker In=16A

P=11 kW =>    I=19,9 A ;  wire 4 mm2, Circuit breaker In=20A

P=15 kW =>    I=27 A ;  wire 6 mm2, Circuit breaker In=32A

P=18,6 kW => I=33,6; ;  wire 6 mm2, Circuit breaker In=40A

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P=57,7 kW => I=104,2 A ;   wire 25 mm2, Circuit breaker In=125A