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看看这个定义可能有助于理解 SELV 为嘛要加basic,
5 m: r( V, J) L' z( G, b* qsafety extra-low voltage
" ]# k6 h4 e& K. O4 Cvoltage not exceeding 42 V between conductors and between conductors and earth or
6 ?" H) a' R/ {$ o" g7 Hfunctional earth, the no-load voltage not exceeding 50 V。
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$ m5 }/ v/ T Y: X! u8.1.4 An accessible part is not considered to be live if:+ l' d; }/ w" c* Q- [2 x" ^
– the part is supplied at safety extra-low voltage, provided that6 O% @2 W ?# u1 q1 Y6 ?( i+ V
• for AC, the peak value of the voltage does not exceed 42,4 V;
% X' U% ]. D2 C) T• for DC, the voltage does not exceed 42,4 V;( P# L& F# D# E3 Y& Q. G
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