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看看这个定义可能有助于理解 SELV 为嘛要加basic,
* N! g# _0 s5 s1 p: `( k* A/ Ssafety extra-low voltage
7 B% `" N, v* s% {8 J. U0 V v% Vvoltage not exceeding 42 V between conductors and between conductors and earth or& Z% l+ ~! \/ v$ V
functional earth, the no-load voltage not exceeding 50 V。
: {6 S R0 Q5 P" ^- h
+ f- N0 o8 P0 h: M- N) z8.1.4 An accessible part is not considered to be live if:3 o% M1 b1 s1 h* p, C+ p
– the part is supplied at safety extra-low voltage, provided that
. X- C& ?0 \4 [# n5 I# P- _4 ^• for AC, the peak value of the voltage does not exceed 42,4 V;. R1 G4 a+ Z, Q
• for DC, the voltage does not exceed 42,4 V;) K* P; I" L# ?; m
y2 `0 N7 Y% P# v" G# t" t2 d2 |1 c0 n U6 @* v
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