A.1.5~2.5mm2 B.2.5~3.5mm2 C.3.5~5.5lnm2 D.5.5~14mm2
A.0.1~0.3 B.0.3---0.5 C.0.5~0.7 D.0.7---0.9
A.1/3 B.1/2 C.2/3 D.1/4