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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- X/ K/ ^& o' B; S2 Q' \; K) c
live part& E% n4 }0 P, b0 o. m! l
conductor or conductive part intended to be energized in normal use, including a neutral. p6 C8 J6 Y& j6 w7 l! `
conductor but, by convention, not a PEN conductor
, a# k. B% ^6 v6 LNOTE 1 Parts, accessible or not, complying with 8.1.4 are not considered to be live parts.+ h M; t& U( p* Q
请注意这里的note 1
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& ~; Q8 b4 y5 o3 G3 j4 ksafety extra-low voltage
; k; [8 h; b. nvoltage not exceeding 42 V between conductors and between conductors and earth, the noload
6 k; h9 V: i2 R. H! ]% C! q* Q7 fvoltage not exceeding 50 V" U' o/ e8 F3 ^3 E) u8 R v
When safety extra-low voltage is obtained from the supply mains, it is to be through a0 a4 b- F1 h0 |0 k5 X
safety isolating transformer or a convertor with separate windings, the insulation of which i! \8 B. }" Z# @0 b( E
complies with double insulation or reinforced insulation requirements.
3 h! W7 X- @1 O9 l/ W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.* E. R3 Q; {4 S3 T# k* R L4 K
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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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