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What will be the size of cable for 75 HP 220 Volts 3 phase motor?
Wiki User
∙ 14y ago
75 HP = 55 KW
55 = 31/2 x 0.220 x I x cos φ = 31/2 x 0.220 x 0.8 x I
I = 55/(31/2 x 0.220 x 0.8) = 180,42 A
3 x 70 mm2 is the size of cable for 75 HP 220 Volts 3 phase motor
Wiki User
∙ 14y ago
Fredrick Langat
Wiki User
∙ 11y agoHave to know what voltage the motor is connected to.
70 mm2 per line, for 134 A and 400V.
Answer for USA, Canada and countries running a 60 Hz supply service.
The formula for amperage when horsepower is shown is,
I = HP x 746/1.73 x E x %Eff. x pf = 75000/1.73 x 400 x .90 x .90 = 75000/561 = 133 amps.
Motor cables have to be rated at 125% of the motors full load amps. 133 x 125% = 166 amps.
A # 2/0 copper wire with an insulation factor of 75 or 90 degrees C is rated at 175 and 185 amps respectively.
If the motor is over a large distance from the supply distribution go to a 3/0 conductor which is one size larger. This will overcome any voltage drop that may occur.
Wiki User
∙ 10y agoThe size of the wire would depend on the current drawn, and that depends on the voltage it is designed to work at. A motor that size could be 415 v or a higher voltage.
A 75 kW motor would need a 100 kVA supply and at 415 v that would be 140 amps, requiring a wire size of #0 or 50 mm2 cross section.
At a higher voltage the current would be less and the wire size would be smaller. At 11 kV the current would be only 5.3 amps, requiring wire of only 1.0 mm2 cross-section.
Wiki User
∙ 11y agoNo . . . that is because you did not specify the voltage.
Wiki User
∙ 10y agoThe cable size feeding 75hp-3phase motor is 16mm square in measurement.
Wiki User
∙ 11y ago150x4
Wiki User
∙ 11y ago240mm sq
Anonymous
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