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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) s- ^8 a4 N: p/ nlive part& f+ R0 { O V- \. ?
conductor or conductive part intended to be energized in normal use, including a neutral; W- v: k( \5 g& k6 d0 Q5 J
conductor but, by convention, not a PEN conductor' `( e5 M+ T- d8 D7 ]* a
NOTE 1 Parts, accessible or not, complying with 8.1.4 are not considered to be live parts.; Z# Y( z! }) c( b. R. A0 |
请注意这里的note 1/ U% W& f5 \' w4 n" ^
$ p8 @* _. E2 q- u% A+ Fsafety extra-low voltage
! s: p( E: Y Y) Fvoltage not exceeding 42 V between conductors and between conductors and earth, the noload" c* I4 y6 b1 t) B' X
voltage not exceeding 50 V, q, v% H4 q/ ~+ g, d3 R
When safety extra-low voltage is obtained from the supply mains, it is to be through a3 M) J; i. w4 ? N; @! T4 `
safety isolating transformer or a convertor with separate windings, the insulation of which
/ z/ y; z0 N/ bcomplies with double insulation or reinforced insulation requirements.
# \) l. M; _9 X9 v; t1 q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.
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& v" r2 ~! c% c5 V2 K* J# Z8 Z8.1.4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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