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看看这个定义可能有助于理解 SELV 为嘛要加basic,
! R" ?. H6 h2 e- T! d1 H8 f) F% ysafety extra-low voltage# A2 @# ?' u, L) S8 G2 A
voltage not exceeding 42 V between conductors and between conductors and earth or
$ h W5 n8 {2 T7 z7 H; F Kfunctional earth, the no-load voltage not exceeding 50 V。
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8.1.4 An accessible part is not considered to be live if:
3 k' g3 @6 h+ n8 ^+ f1 Y& D2 P- z– the part is supplied at safety extra-low voltage, provided that+ D1 o+ b# r) W' U) s+ y
• for AC, the peak value of the voltage does not exceed 42,4 V;/ s9 G% A4 r. C, o
• for DC, the voltage does not exceed 42,4 V;4 N5 ^ k( ^& e. A: @' Y6 z$ h% Q- Y
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