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看看这个定义可能有助于理解 SELV 为嘛要加basic,
) J* ]; ^( F: B4 q/ h: B$ a ssafety extra-low voltage& j) p) D: \! v/ d
voltage not exceeding 42 V between conductors and between conductors and earth or" }( [( P0 b9 J0 V: G
functional earth, the no-load voltage not exceeding 50 V。' I, S# h: _* l0 N
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8.1.4 An accessible part is not considered to be live if:
3 ?. H$ W- L3 A( O# [– the part is supplied at safety extra-low voltage, provided that
' i% L0 L3 a( V• for AC, the peak value of the voltage does not exceed 42,4 V;' l6 U$ }# B8 M/ K0 j3 d
• for DC, the voltage does not exceed 42,4 V;
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