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看看这个定义可能有助于理解 SELV 为嘛要加basic,
& A# f& ?1 T- N8 usafety extra-low voltage
0 E' k' i/ Z; ]voltage not exceeding 42 V between conductors and between conductors and earth or8 Z; B( |! X7 t4 \: M* W
functional earth, the no-load voltage not exceeding 50 V。
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8.1.4 An accessible part is not considered to be live if:, h/ z6 h C- R3 L3 N$ r1 Q% V
– the part is supplied at safety extra-low voltage, provided that& W6 L8 i9 z, q, ?$ N) q K
• for AC, the peak value of the voltage does not exceed 42,4 V;
" O4 w. x' N6 m4 Z) U+ s• for DC, the voltage does not exceed 42,4 V;
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