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看看这个定义可能有助于理解 SELV 为嘛要加basic,5 h) ?& a+ F a3 o
safety extra-low voltage
2 S) D- P% ?4 s7 t/ Pvoltage not exceeding 42 V between conductors and between conductors and earth or9 Z/ ^2 [3 A1 f N4 O/ r
functional earth, the no-load voltage not exceeding 50 V。
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4 h5 c2 c/ ~& C3 a! d5 s$ D0 Z8.1.4 An accessible part is not considered to be live if:+ f6 n; H2 U: _; [, X" m
– the part is supplied at safety extra-low voltage, provided that, z! q f# f( t# E
• for AC, the peak value of the voltage does not exceed 42,4 V;0 j( O: ?/ w+ {3 D" u
• for DC, the voltage does not exceed 42,4 V;" n& R& T; f$ K& Y3 X
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