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看看这个定义可能有助于理解 SELV 为嘛要加basic,6 C6 V% }# `# W' z
safety extra-low voltage, p" k2 j: w! \' y- d
voltage not exceeding 42 V between conductors and between conductors and earth or
7 s0 {. W8 j8 F dfunctional earth, the no-load voltage not exceeding 50 V。0 i) V, F; F3 d4 B! H! T5 m% }( q
; _, x' m5 O) V6 t1 F4 O; S8.1.4 An accessible part is not considered to be live if:1 ] t& C! ]+ ]8 A" l8 S; s
– the part is supplied at safety extra-low voltage, provided that/ ~( O# v2 y* Z- \. i# |( q. D
• for AC, the peak value of the voltage does not exceed 42,4 V;
) n3 ]* i1 ~ \% m2 e• for DC, the voltage does not exceed 42,4 V;
2 v) n) b6 p+ e, z! O, X8 A, R" N$ \$ g0 i |
* a' ]" E5 S) i3 I2 V# \ |
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