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看看这个定义可能有助于理解 SELV 为嘛要加basic,
) N$ d+ I# u, g, Msafety extra-low voltage3 E/ \ V: r8 a' p
voltage not exceeding 42 V between conductors and between conductors and earth or# E' G; {8 c" o& }3 ^
functional earth, the no-load voltage not exceeding 50 V。* b7 N8 n$ y, R9 h# d4 ^
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8.1.4 An accessible part is not considered to be live if:
- k4 y" G# x* @' n! M– the part is supplied at safety extra-low voltage, provided that
4 \5 i y; E4 ^) g6 O4 H5 I• for AC, the peak value of the voltage does not exceed 42,4 V;! ]' O$ J. K* \6 g3 b& y
• for DC, the voltage does not exceed 42,4 V;
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