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看看这个定义可能有助于理解 SELV 为嘛要加basic,) @; ^2 H- C+ C7 l# W
safety extra-low voltage
. }& u3 M: X2 K; a0 Yvoltage not exceeding 42 V between conductors and between conductors and earth or- L5 U# f! C# X& v$ a- C2 C
functional earth, the no-load voltage not exceeding 50 V。: O* o0 g/ i* ^: q" Z4 t1 S5 L
3 U# k* e$ Y2 d. F6 R0 W% P* @# p3 C8.1.4 An accessible part is not considered to be live if:
4 X( i( v1 i! i9 A; H# g– the part is supplied at safety extra-low voltage, provided that
l4 m2 s$ p' _6 }; S+ |• for AC, the peak value of the voltage does not exceed 42,4 V;
# y3 ^+ s9 o& l! f& |• for DC, the voltage does not exceed 42,4 V;
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