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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; U9 D9 B7 W0 y% }
live part
! ^ _, \9 \/ O$ iconductor or conductive part intended to be energized in normal use, including a neutral4 \$ q7 ^3 Q5 |3 q, D, F+ G& m
conductor but, by convention, not a PEN conductor4 s9 N' [: o0 S( i( v" K
NOTE 1 Parts, accessible or not, complying with 8.1.4 are not considered to be live parts.# W" G- |* f$ v. f
请注意这里的note 1* q$ s2 r- m! `( r3 h
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safety extra-low voltage
# V1 W+ r6 n& w% ~/ f& Z3 t+ nvoltage not exceeding 42 V between conductors and between conductors and earth, the noload
6 V' U* }; `9 \- O+ Jvoltage not exceeding 50 V
' z! Q9 L! [! ]0 x4 I- C+ Q( p1 RWhen safety extra-low voltage is obtained from the supply mains, it is to be through a* e y9 L7 v( d' e7 b
safety isolating transformer or a convertor with separate windings, the insulation of which
, e, J9 n6 i8 ccomplies with double insulation or reinforced insulation requirements.# i: @2 L; }$ | E# y9 }) F7 E- C* H
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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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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