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看看这个定义可能有助于理解 SELV 为嘛要加basic,. W' V$ r/ C& B1 V7 I- t6 e. S7 U
safety extra-low voltage8 S4 L: C. B& ^ f% E: d* K
voltage not exceeding 42 V between conductors and between conductors and earth or2 ~2 W% n# Z( ?0 Y
functional 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:" F) H) k& H& [5 q
– the part is supplied at safety extra-low voltage, provided that- B" [5 c4 }( ?0 f# f1 a' c
• for AC, the peak value of the voltage does not exceed 42,4 V;
, e M, C. V8 U9 j* t3 F• for DC, the voltage does not exceed 42,4 V;
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