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看看这个定义可能有助于理解 SELV 为嘛要加basic,
* l2 ^3 f: ~7 Z' K, A) Z1 lsafety extra-low voltage1 {& I0 k& c( A
voltage not exceeding 42 V between conductors and between conductors and earth or
. V- K8 d ]! E/ G7 {- q/ Dfunctional earth, the no-load voltage not exceeding 50 V。/ V' I s* `; c0 F
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8.1.4 An accessible part is not considered to be live if:
4 R: q. k& K4 I4 U3 N$ y– the part is supplied at safety extra-low voltage, provided that
9 N' W- t0 H- [4 q4 u& @& D• for AC, the peak value of the voltage does not exceed 42,4 V;/ M: D( i/ `. E# O. \
• for DC, the voltage does not exceed 42,4 V;
0 b1 V- Z4 x5 i5 V+ Y& `
, S. [0 j$ h& U0 L1 V+ [& u% M/ j' `
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