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看看这个定义可能有助于理解 SELV 为嘛要加basic,
; \4 z& ?; M7 [safety extra-low voltage
* z3 N0 h8 t9 L) [5 O0 ]8 |voltage not exceeding 42 V between conductors and between conductors and earth or
: t ]$ P V* N6 f, J) {- K# Lfunctional 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:( q% B# Y! N( ^$ P J
– the part is supplied at safety extra-low voltage, provided that. N, w ]+ l @3 } v$ O
• for AC, the peak value of the voltage does not exceed 42,4 V;% q- U2 d" A! [
• for DC, the voltage does not exceed 42,4 V;' l1 v/ d2 ~. k, _' o7 L* u
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