推荐回答（1个）
连接30千瓦的电动机，需要16平方的铜电线。
由电机功率公式P=1.732UIcosφ（用三相市电计算，功率因数取0.85）有：
I=P/(1.732Ucosφ)
=30/(1.732x0.38x0.85)
=54A
额定运行电流在54A左右,16平方铜电缆长期连续负荷允许电流在60A，则可以选用16平方铜电缆。
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