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第8.1.4章的目的是判断那些载流部件是live part, 是不可触及的,先给出两个定义, live part 和安全特低电压
& q/ D" d) }3 [( t5 C( w0 ^live part
9 l- [6 h) G. i! G& S: E0 }6 q9 gconductor or conductive part intended to be energized in normal use, including a neutral
3 d* }$ Z/ R$ C* _conductor but, by convention, not a PEN conductor
' G* `* ]; B+ o' S& pNOTE 1 Parts, accessible or not, complying with 8.1.4 are not considered to be live parts.
# S5 H. l7 q: p6 y请注意这里的note 17 t/ J7 H& A: C0 |4 u! E+ Q/ `
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safety extra-low voltage/ z2 a# G& L. v: ]8 M5 y; P4 {, r
voltage not exceeding 42 V between conductors and between conductors and earth, the noload9 w! X2 w& s0 z, s( ]9 R$ T1 c4 ]) @# ~" N
voltage not exceeding 50 V
! u" G$ h2 }- W4 O: H& ]; A; |5 `When safety extra-low voltage is obtained from the supply mains, it is to be through a
4 k( M9 A: @0 ]" W$ j4 O/ @0 isafety isolating transformer or a convertor with separate windings, the insulation of which# `+ m$ b/ N' U! ~
complies with double insulation or reinforced insulation requirements.1 f9 a7 [% o5 w) @! c+ @ B
请注意这里的电压, 对于600335, 凡是没有特别说明的, 电压都是指R.M.S.值, 你比较一下8.1.4中的电压值就可以知道了,并不是所有的安全特低电压都可以触及的.# s& p0 y+ C, ^" a$ W* V: n
* ]- u2 x# R5 m+ L# L8.1.4中的电压没有说是否带载,那也就是说空载,带载都要考虑的 |
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