A.分配電箱→開關箱→總配電箱 B.總配電箱→開關箱→分配電箱 C.總配電箱→分配電箱→開關箱 D.開關箱→分配電箱→總配電箱
A.30mV,0.1S B.60mV,0.1S C.30mV,1S D.100mV,0.1S
A.220V B.12V C.36V D.380V