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看看这个定义可能有助于理解 SELV 为嘛要加basic,9 d8 P9 t3 g; }" v5 T' b$ ^
safety extra-low voltage- r. i1 R% w" x: T( N& Y
voltage not exceeding 42 V between conductors and between conductors and earth or
- ~# L7 U$ w3 p7 Yfunctional earth, the no-load voltage not exceeding 50 V。0 |9 s4 m4 Z1 f2 W; U" m
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8.1.4 An accessible part is not considered to be live if:, ]' h, z- D$ @# @
– the part is supplied at safety extra-low voltage, provided that
2 P# n% D( R2 O2 G: X% h1 j• for AC, the peak value of the voltage does not exceed 42,4 V;9 B2 S) R% p: G. j5 r) M6 u9 I
• for DC, the voltage does not exceed 42,4 V; {+ k. C E7 n/ L) V
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