拜求配电箱电缆尺寸

[ size=5]各位大虾，请问1200安培的主配电箱要分别接在600安培，400,250,225,100安培的分箱上面，电缆尺寸是多少啊？ 电压120/208伏。这是位客户问我的，小女子完全不懂，拜请各位专家赐教。

英文原文： i will install one 1200 Amp panel box for each two generators
Enayatullah faryabi: i dont know what size cable i should run from generators to panel
Enayatullah faryabi: and, also i need to run cables from the 1200 amp panel to one 600 amp breaker, to one 400 amp breaker, and to two 250 amp breaker, i dont know the cable sizes to run

also, i need to run a power cable from the 1200 amp main panel to 400 amp subpanel, i dont the cable size, i mean what size should be used?

the cable should be five core, three hot, one neutral, one ground
Enayatullah faryabi: also, the voltage is 120/208 volts


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