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看看这个定义可能有助于理解 SELV 为嘛要加basic," B1 @5 V, P1 v1 c! ^; y$ X$ l+ S
safety extra-low voltage
$ I: [3 L5 S' u; S9 _voltage not exceeding 42 V between conductors and between conductors and earth or# m" r* r: L2 t! L3 X, s O
functional earth, the no-load voltage not exceeding 50 V。5 f" y/ @4 _6 n# X( O& P
6 ?' F1 L" T8 S( c" W* ~1 T8.1.4 An accessible part is not considered to be live if:- ^# H! t# u# K* X. P/ q
– the part is supplied at safety extra-low voltage, provided that8 m/ y2 ~" |8 h: U9 v4 d. |
• for AC, the peak value of the voltage does not exceed 42,4 V;
8 a) a ~/ |! r• for DC, the voltage does not exceed 42,4 V;
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