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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3 V$ d% E( H1 t* Y2 \! p2 S7 D! t. K2 W
live part
/ ~/ O" B- e' L7 [6 i9 Mconductor or conductive part intended to be energized in normal use, including a neutral
9 a1 e) V( C: F S+ s+ Y% P! uconductor but, by convention, not a PEN conductor
/ z* z% v; t5 V; cNOTE 1 Parts, accessible or not, complying with 8.1.4 are not considered to be live parts.
K( z; S8 }% W请注意这里的note 1
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safety extra-low voltage
. l$ S& \+ F5 d. O# O3 Gvoltage not exceeding 42 V between conductors and between conductors and earth, the noload
. x! ^' r# j+ H/ ivoltage not exceeding 50 V" R: F" a+ R# w1 U
When safety extra-low voltage is obtained from the supply mains, it is to be through a
9 k1 S) b- W+ F9 R3 Isafety isolating transformer or a convertor with separate windings, the insulation of which6 G, N9 ~% [: U, _2 k, [ i, b
complies with double insulation or reinforced insulation requirements.
! I+ `1 N9 w0 v4 p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.$ }5 q. @+ z1 {$ f) S% g/ E; ?
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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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