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看看这个定义可能有助于理解 SELV 为嘛要加basic,+ Q8 t8 }0 Z9 C" \* i: J7 N5 K
safety extra-low voltage* f/ D+ Z( A7 U
voltage not exceeding 42 V between conductors and between conductors and earth or' c: G2 r2 C$ ]
functional earth, the no-load voltage not exceeding 50 V。2 w* f7 \9 N/ H, V X7 Q
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8.1.4 An accessible part is not considered to be live if:# G* x/ ^0 j/ B: @' _5 N; V
– the part is supplied at safety extra-low voltage, provided that1 S9 j# S& Q+ P9 _
• for AC, the peak value of the voltage does not exceed 42,4 V;
3 }- Y: O/ o. h6 ]• for DC, the voltage does not exceed 42,4 V;
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