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看看这个定义可能有助于理解 SELV 为嘛要加basic,
9 ? h) c/ @- Y* o7 isafety extra-low voltage, W( a ^, ^2 W9 d: @- g$ L4 t
voltage not exceeding 42 V between conductors and between conductors and earth or. o3 j% ]2 Y* j! y4 h
functional earth, the no-load voltage not exceeding 50 V。/ A; [+ e5 B2 W+ I& u0 b; G+ U* f
, p/ E7 Z. l, L0 m8 C8.1.4 An accessible part is not considered to be live if:
# _4 u6 m/ h% q$ ^; u' A/ l– the part is supplied at safety extra-low voltage, provided that
0 \0 {+ E7 H# p0 e/ z• for AC, the peak value of the voltage does not exceed 42,4 V;
' V7 f& w' F; J! p! k5 p• for DC, the voltage does not exceed 42,4 V;
. E; n' o6 |) k. f# a u: A4 x" f5 Q! a, ?9 P" t" b* s$ H4 @; i# d$ Q
4 L* W5 h2 C5 @/ j. `& l0 U1 ?0 x
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