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看看这个定义可能有助于理解 SELV 为嘛要加basic,3 R* ? \% d3 ?, f9 D" R: B
safety extra-low voltage
. f8 m1 d7 }2 q# e% G5 j4 {voltage not exceeding 42 V between conductors and between conductors and earth or( a7 E8 u" Z4 ?% k( T0 T- U
functional earth, the no-load voltage not exceeding 50 V。/ e/ |; N5 ?+ N( I& ^2 d
d( e7 N' J4 i- C, C8.1.4 An accessible part is not considered to be live if:, g8 m# u! N7 t. T* o
– the part is supplied at safety extra-low voltage, provided that
3 _0 J; K) S% }0 W0 p• for AC, the peak value of the voltage does not exceed 42,4 V;- }! m( [$ |3 p& p
• for DC, the voltage does not exceed 42,4 V;* e; F. e0 I% ~# ~, T
( I0 V) q$ K" M* o7 s+ J; [) [( l9 t/ r4 @
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