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看看这个定义可能有助于理解 SELV 为嘛要加basic,
9 J' a6 f W7 H, _3 Q- Z& B% Bsafety extra-low voltage+ Z! q+ j. d7 N
voltage not exceeding 42 V between conductors and between conductors and earth or
0 i% j$ F& d5 I. y+ Bfunctional earth, the no-load voltage not exceeding 50 V。' h% C: h9 P$ R3 M( S
7 e% V% H" w5 N8.1.4 An accessible part is not considered to be live if:! G& t( Q2 Z( b9 t
– the part is supplied at safety extra-low voltage, provided that- k2 z2 q( ^) n0 g
• for AC, the peak value of the voltage does not exceed 42,4 V;
. A+ o$ f, S' w& o4 ~• for DC, the voltage does not exceed 42,4 V;. G" }9 Z3 e" N9 m3 _5 Z
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