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看看这个定义可能有助于理解 SELV 为嘛要加basic, e. P- i6 x; d3 Y) W x) k
safety extra-low voltage
" W. r) B6 c& h! B) Y# Tvoltage not exceeding 42 V between conductors and between conductors and earth or
2 i/ @5 X: s1 a& z# I# ~+ E+ K2 ]' wfunctional earth, the no-load voltage not exceeding 50 V。9 [1 t5 C! W" t X3 _8 j7 f
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8.1.4 An accessible part is not considered to be live if:- {8 W1 r0 p1 `: x
– the part is supplied at safety extra-low voltage, provided that
4 U5 N8 X8 K( l6 q0 s9 B• for AC, the peak value of the voltage does not exceed 42,4 V;5 x4 c7 c# `$ n5 ~: b
• for DC, the voltage does not exceed 42,4 V;
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