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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, b2 O$ ? \( Z8 c% a3 _
live part5 [1 a& k# e3 |: W: }1 E9 P
conductor or conductive part intended to be energized in normal use, including a neutral" X E+ }1 [% j$ G6 F
conductor but, by convention, not a PEN conductor3 V: d, Y# H4 v- [9 W" d" D, G8 q8 n" v
NOTE 1 Parts, accessible or not, complying with 8.1.4 are not considered to be live parts.
9 n: j; }: j1 N/ z$ ?1 L& q/ o请注意这里的note 18 T F5 M6 g2 P) T+ F/ w. g
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safety extra-low voltage
?; N# @ e9 e+ Y. f7 E1 \voltage not exceeding 42 V between conductors and between conductors and earth, the noload5 e3 Z& Z3 j# \$ h; Y/ }8 R' s
voltage not exceeding 50 V
$ @1 F$ K B( D/ r& Z; |When safety extra-low voltage is obtained from the supply mains, it is to be through a
# ] [4 f/ T4 O9 Lsafety isolating transformer or a convertor with separate windings, the insulation of which; v& Q* T4 V! X, Q# o
complies with double insulation or reinforced insulation requirements.
& W0 p- _ T9 F5 [$ |7 O0 e( T( R+ 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.
" n) ~9 B3 q* k( _- X. h4 Y! a! s" y/ {( g# D# T6 d f! ^4 C
8.1.4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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