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看看这个定义可能有助于理解 SELV 为嘛要加basic,9 j8 d d6 w4 ~) A9 a
safety extra-low voltage4 M8 x8 G( R! E" U# Z7 ^) v
voltage not exceeding 42 V between conductors and between conductors and earth or
: S' F9 s( k8 ~2 hfunctional earth, the no-load voltage not exceeding 50 V。
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0 l7 S) e: { h) K' u! f8.1.4 An accessible part is not considered to be live if:
. w2 x' `& l4 w0 o: c- d– the part is supplied at safety extra-low voltage, provided that
0 }1 a s) \% L% I& _* f6 o' z2 I• for AC, the peak value of the voltage does not exceed 42,4 V;
|5 a. U8 s! L* A" w• for DC, the voltage does not exceed 42,4 V;
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