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看看这个定义可能有助于理解 SELV 为嘛要加basic,
. R* X$ p$ @) O! S- Msafety extra-low voltage
' o3 D: ~8 x _" x8 {% zvoltage not exceeding 42 V between conductors and between conductors and earth or
7 H) z) M3 r& V+ c, zfunctional earth, the no-load voltage not exceeding 50 V。
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0 J3 R- Y( U. H# V+ i+ c8.1.4 An accessible part is not considered to be live if:
2 r9 J$ l! v2 d% Z3 B– the part is supplied at safety extra-low voltage, provided that" c3 B! y% V/ ?4 @. \2 r, s4 D: F* J
• for AC, the peak value of the voltage does not exceed 42,4 V;5 V2 _% Q, N; Q: w7 @! T
• for DC, the voltage does not exceed 42,4 V;( v8 D2 r8 y5 P& B# o
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