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看看这个定义可能有助于理解 SELV 为嘛要加basic,
, Y( S3 E7 a6 _8 Csafety extra-low voltage: `: ^' K: j- M' }; ]% ^. R
voltage not exceeding 42 V between conductors and between conductors and earth or
' r% w3 L9 y( I) m' O9 Z$ yfunctional earth, the no-load voltage not exceeding 50 V。
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: `2 z$ k$ A& Q9 p' Z8.1.4 An accessible part is not considered to be live if:: Q8 ]( @& x; o, _
– the part is supplied at safety extra-low voltage, provided that
6 R) l- i# P2 k4 [ C• for AC, the peak value of the voltage does not exceed 42,4 V;) @0 H% D b! |7 z% E% J
• for DC, the voltage does not exceed 42,4 V;: U6 K- m/ F( L) s- D# T
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