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看看这个定义可能有助于理解 SELV 为嘛要加basic,% b8 x) [$ h* y" H
safety extra-low voltage. N2 Z) a( R+ f8 v( `. o
voltage not exceeding 42 V between conductors and between conductors and earth or! W! x" d' q1 I4 j8 c' m5 v4 H" r# D7 N
functional earth, the no-load voltage not exceeding 50 V。3 w3 C* M# e0 m( Y. s' w$ Z
* ?) _ t3 ], F! u7 \# h8.1.4 An accessible part is not considered to be live if:+ d/ g- G1 R; m* X' L, R9 v* n
– the part is supplied at safety extra-low voltage, provided that
" P# ]/ u d2 S! L4 v( I) H7 q• for AC, the peak value of the voltage does not exceed 42,4 V;
' D) t9 O# m2 `3 h+ k: B• for DC, the voltage does not exceed 42,4 V;4 B. L- m" R0 |" B& s' ]4 |! C
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