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看看这个定义可能有助于理解 SELV 为嘛要加basic,2 U2 l) S; s& r* p2 z O, M( s, d! B7 K
safety extra-low voltage
2 ~% k/ U0 _0 ~; ovoltage not exceeding 42 V between conductors and between conductors and earth or
* i( |4 k2 j: w, V9 o+ Ffunctional earth, the no-load voltage not exceeding 50 V。
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/ w4 O' c6 D: Q* i8.1.4 An accessible part is not considered to be live if:
9 r( s S& [; r2 i* y, e1 A– the part is supplied at safety extra-low voltage, provided that
7 W$ x" h0 I n% f: d' O• for AC, the peak value of the voltage does not exceed 42,4 V;8 p4 ]" ^ b' P
• for DC, the voltage does not exceed 42,4 V;
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