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看看这个定义可能有助于理解 SELV 为嘛要加basic,
! a/ a4 S! p. R6 A+ Isafety extra-low voltage9 f" A8 M/ t$ {. F4 c
voltage not exceeding 42 V between conductors and between conductors and earth or+ x6 K6 e1 G0 j5 N. B
functional earth, the no-load voltage not exceeding 50 V。' l9 R- g# R9 \& ^- \4 O
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8.1.4 An accessible part is not considered to be live if:5 h: W- w, {; w# W. r
– the part is supplied at safety extra-low voltage, provided that# h/ u+ N( e3 \# U5 J
• for AC, the peak value of the voltage does not exceed 42,4 V;" b& e* J7 c) G, h: S
• for DC, the voltage does not exceed 42,4 V;
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