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看看这个定义可能有助于理解 SELV 为嘛要加basic,: j8 Z/ G6 m7 a; S* T4 j# o5 z
safety extra-low voltage
* i) T# c, r; Q( \4 S* S0 Mvoltage not exceeding 42 V between conductors and between conductors and earth or( q3 O: r0 l7 U( S
functional earth, the no-load voltage not exceeding 50 V。7 o M) v) b x) u
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8.1.4 An accessible part is not considered to be live if:$ z, I9 l4 a o/ o4 H1 }- ~% _
– the part is supplied at safety extra-low voltage, provided that! C6 {# r7 K+ f- Q5 {- M; h: q
• for AC, the peak value of the voltage does not exceed 42,4 V;3 Q% l" B: ?0 B
• for DC, the voltage does not exceed 42,4 V;
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