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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
; H) g9 h# j3 D3 ]8 c7 R1 C% elive part
( \+ M9 q }! P% Gconductor or conductive part intended to be energized in normal use, including a neutral
. S: C. t& W5 cconductor but, by convention, not a PEN conductor& `/ {7 w! u! B% q! e4 K
NOTE 1 Parts, accessible or not, complying with 8.1.4 are not considered to be live parts.9 \7 k- `3 a, m1 e& W
请注意这里的note 1" R, E) j2 d$ X% W9 A. P. H1 h
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safety extra-low voltage
& ~7 x& [1 I3 q K' P2 ^7 qvoltage not exceeding 42 V between conductors and between conductors and earth, the noload7 l+ k- x% x) ?6 C2 l t
voltage not exceeding 50 V
- M2 O$ q9 W- j: m5 y$ QWhen safety extra-low voltage is obtained from the supply mains, it is to be through a2 m) y& z/ _! S+ h' ^+ F1 C
safety isolating transformer or a convertor with separate windings, the insulation of which% \) E7 G- f6 B+ o5 I/ }3 ~
complies with double insulation or reinforced insulation requirements.
7 u2 X2 I% R4 b: X& C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.8 ?7 y7 f! Y2 M. o
8 v8 | }2 o# P. L6 f7 H4 e8.1.4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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