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看看这个定义可能有助于理解 SELV 为嘛要加basic,
$ d# }& c+ l' i. W' O5 c% vsafety extra-low voltage
. ?& q; l) v+ M' c( g- cvoltage not exceeding 42 V between conductors and between conductors and earth or8 `1 F; P _6 F9 K/ n1 y3 y4 X
functional earth, the no-load voltage not exceeding 50 V。
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* @( ?7 c6 H& @4 `! m6 V" o, ~" }8.1.4 An accessible part is not considered to be live if:
1 z. i5 k \! }* N– the part is supplied at safety extra-low voltage, provided that. |6 Q6 d* q9 i) `7 s
• for AC, the peak value of the voltage does not exceed 42,4 V;
% E% T3 ?4 U) l) V3 M3 }/ F• for DC, the voltage does not exceed 42,4 V;
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