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" {# h( @5 G8 P5 T6 k2 N0 a6 q. Q' ?% e/ o; d: @- q# M
| Protective Impedance% s/ d( ?0 v# {' }
| 6.5.3
6 g# f1 U! X, K. Q# M. U | 61010-1(ed.1);am1;am2& S3 I" @- ^3 g. W; G& Y g
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0 l3 B: `- D6 H* O; @- }
9 L8 x$ }$ I6 `9 IStandard:
9 e7 N9 X/ ^4 ~7 YIEC 61010-1:1990# G# e- z9 r0 Q" `: [
+A1:1992+A2:1995- H5 B" _/ ^4 E0 C
Sub clause:
3 F1 l0 J# t8 T) [8 v6.5.3
6 \( m# E& i/ Q; T; O& y8 MSheet n. 300) Q* ^$ h1 L1 A1 G6 n& a
Page 1(1)2 A6 Z+ F: f; n# R% u8 a
Subject:( e- ~% A7 ^3 b; H @: O+ O
Protective Impedance' H3 [" V1 x8 n3 t7 @, _" \
Key words:( k' `9 Y4 j- j+ k- G" V
- Shock8 i4 [8 |9 T' q6 D
- Impedance) y# B/ Y2 @" a/ L
- Protective
+ J( @* m: x# p5 U8 tDecision taken by
; s( U, Q5 {$ \3 I7 bETF3 and confirmed% }5 Z$ K9 [8 {( k" n
by CTL at its 38th
' [3 E% I: E. f) g9 emeeting, in Toronto- C( \& E2 ~7 I/ x0 F/ I
Question:1 E1 @! p9 k C. C/ e( [
Where a component acts as protective impedance in single fault condition, should it be rated
7 Y) a1 K8 @0 d3 x- q: [7 c( Z: Wfor this function? An example is a component in an accessible secondary circuit which may
* q, d7 ^" n* _1 Kbe made hazardous live by the failure of a creepage or clearance distance." E8 I4 i. H ^
Decision:6 C' i5 x( c8 G# w" I5 ?. q$ W
Such components should be rated for the single fault condition.
% J7 `3 k" v: ]! lExplanation:1 I1 B/ p7 o- k- d+ K2 r9 @- @% E* ~ s
The safety of the user will be dependent on the operation of these devices. It will, however,
1 H& ~1 Z) [8 O6 Gbe preferable for the design to avoid this circumstance as the integrity of the components is
" U9 _/ V) y1 K8 S2 bnot defined.
5 }, U6 k# ?5 l- M4 ~+ B1 \$ ?" v9 q. a: ~+ K0 M. n. \0 x' |- z" d) ?6 m
, p$ J1 _$ w4 x
9 O3 b; P1 R: \) u7 E+ x
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发表于 2012-9-19 15:05
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