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看看这个定义可能有助于理解 SELV 为嘛要加basic,
) Y6 D. q8 \. n! ~safety extra-low voltage
* x4 U6 J+ n, c: fvoltage not exceeding 42 V between conductors and between conductors and earth or
) _. U' Q2 g1 @$ L2 zfunctional earth, the no-load voltage not exceeding 50 V。6 b" w+ X/ S1 t) {) Y
! o, F% x3 e$ @9 g, l8 r8.1.4 An accessible part is not considered to be live if:
1 d6 e2 B2 d5 ~( V) v! L/ E: M– the part is supplied at safety extra-low voltage, provided that
; \" |1 Z8 j6 y8 I; J• for AC, the peak value of the voltage does not exceed 42,4 V;$ y# F, U2 Q1 g# g% \
• for DC, the voltage does not exceed 42,4 V;
- M2 V( p& R& ^; u% i: j/ F9 K% [4 }2 {
- k% l# P& |& o4 k# L
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