|
本帖最后由 craigyu 于 2014-8-4 18:08 编辑 ( R' X5 H8 n, `
2 Y! L0 l, N. n+ B
3.3.6. D4 R, N; O& x$ ~$ k* k- f3 [9 ?
protective impedance
& t9 v* e: n& s4 eimpedance connected between live parts and accessible conductive parts of class II' D( Y5 o+ C. J
constructions so that the current, in normal use and under likely fault conditions in the6 G* V7 E- L$ h$ |; x) E, p6 q
appliance, is limited to a safe value- v' t2 u! O1 {
5 T6 d3 f+ K' X. D9 v' x
8.1.4 An accessible part is not considered to be live if
% z9 ?! K5 e/ {0 H Z– the part is supplied at safety extra-low voltage, provided that
9 I/ e% m0 K1 w3 o% |% `) g$ X9 E• for a.c., the peak value of the voltage does not exceed 42,4 V;; y' ^, k: M2 I! A
• for d.c., the voltage does not exceed 42,4 V;
" F2 [- t- n/ Q& \ P2 ~or; {. f, g' w/ W' J" B! {
– the part is separated from live parts by protective impedance.6 C/ Q; \% x$ m( k, Y. R
If protective impedance is used, the current between the part and the supply source shall
3 t; j) C3 }) H7 g$ E7 w- a6 \not exceed 2 mA for d.c., its peak value shall not exceed 0,7 mA for a.c. and0 i4 f3 x# l. G2 R* b
+ v& e' c+ ~2 Q5 x6 }
22.27 Parts connected by protective impedance shall be separated by double insulation/ M5 M% D$ g y
or reinforced insulation.' w1 e0 y0 Q% L8 w8 s$ m
. j2 S4 G6 ^) c7 Z: ]
22.42 Protective impedance shall consist of at least two separate components. If any one* X( D( g4 X3 U7 t- t3 x& ?
of the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not* ]0 x. F. [2 Q& f
be exceeded.8 J$ c+ V6 c, ~1 E; r' J$ y
& {) ^, T: R' K/ j' v' j+ v5 E
Resistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the; T% E! f! J [$ D" Q- o( c
tests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the
! c( h3 v8 M6 _0 Jappliance. d9 G' c5 |5 p; ~ n6 S
9 G4 O% F# G/ F: c- C
这个结构想做保护阻抗是没可能的,8.1.4后面有要求没贴全,楼主可以看看。 |
评分
-
查看全部评分
|