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看看这个定义可能有助于理解 SELV 为嘛要加basic,# s8 c4 M4 q4 H ?: A
safety extra-low voltage* @) Z- {, h G" q+ L
voltage not exceeding 42 V between conductors and between conductors and earth or
1 |" q: A5 J7 ~- D1 W8 |3 lfunctional earth, the no-load voltage not exceeding 50 V。6 _! f) x3 Q# E) d4 B
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8.1.4 An accessible part is not considered to be live if:
1 d4 R2 K4 l2 b/ F |# r; N– the part is supplied at safety extra-low voltage, provided that
0 S1 t6 o( P# Z5 P' i5 `• for AC, the peak value of the voltage does not exceed 42,4 V;
" \2 h2 R1 Z/ ?- K( T1 }• for DC, the voltage does not exceed 42,4 V;' ^2 o; p$ r6 K- G- x
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