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看看这个定义可能有助于理解 SELV 为嘛要加basic,
$ R: f0 d( y7 K$ K Esafety extra-low voltage
: Q2 U! r% q" ]$ w" Mvoltage not exceeding 42 V between conductors and between conductors and earth or- W/ V' d& J* l, l% g1 C
functional earth, the no-load voltage not exceeding 50 V。6 } f# D& }/ P3 j
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8.1.4 An accessible part is not considered to be live if:
5 X" ~$ e3 Y, x" ]2 [3 S– the part is supplied at safety extra-low voltage, provided that% x m$ f& f" Q# B, ]
• for AC, the peak value of the voltage does not exceed 42,4 V;
# D* s D7 @5 k$ |4 r( j• for DC, the voltage does not exceed 42,4 V;# u [- t+ `+ V. F$ Z" K0 |
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