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看看这个定义可能有助于理解 SELV 为嘛要加basic, R7 X7 E7 h. G& ^# [8 e, o, V
safety extra-low voltage
4 r/ v5 K: H4 G3 Ovoltage not exceeding 42 V between conductors and between conductors and earth or- G. b2 ]1 o- u0 X; X `+ Y
functional earth, the no-load voltage not exceeding 50 V。$ U& D8 Y! g) u2 t* E
* B' ^4 V% H7 j8.1.4 An accessible part is not considered to be live if:
+ B( c9 p! B7 I0 l/ w– the part is supplied at safety extra-low voltage, provided that. z }# K9 I: S, a
• for AC, the peak value of the voltage does not exceed 42,4 V;
: h0 @- q) @$ T9 a& I) ?• for DC, the voltage does not exceed 42,4 V;
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