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| Protective Impedance
8 H8 m+ F; n. v! X | 6.5.3. r) Y' |) |# u1 U( Y
| 61010-1(ed.1);am1;am2 h' Y5 w1 E( g- E3 u- l6 F# V7 K/ r5 F
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7 e) U1 d# j, R1 J8 B8 @Standard:
8 c2 s& Y8 i5 q, Q4 Q; ?IEC 61010-1:1990
& |' I8 A, A! E s) k+ m# {+A1:1992+A2:19956 [/ P. S! f2 [9 s9 {- E- m R: b
Sub clause:: @2 b, {1 B: C/ ]
6.5.3
+ S2 d. V; H% w+ _+ `Sheet n. 300/ p# ^' g( [. @' |1 G$ B
Page 1(1)+ r" ]% U3 U+ }
Subject:
5 k7 a1 J! q0 qProtective Impedance
% C |. O3 \4 E% r% B" GKey words:: l% W- }. O/ q! h
- Shock
8 O. _5 S1 O/ x2 @- Impedance- }+ L; d( \4 J2 L! a% p8 S3 \
- Protective' u2 A. V' Q# L: h9 C2 a) |
Decision taken by- T' i0 Y+ l$ b
ETF3 and confirmed
1 f$ V6 p# [5 V$ y8 b$ x% ?by CTL at its 38th% K) t6 G- Y. r0 {" G h' \3 b3 w0 ?
meeting, in Toronto
3 O7 Y9 a# |' x0 X1 t# n- lQuestion:
2 Y7 t& e- ?- g; k! X* C! {4 `Where a component acts as protective impedance in single fault condition, should it be rated
( Z7 q8 _: R; T- m( Jfor this function? An example is a component in an accessible secondary circuit which may
- K! n3 \+ ^6 c9 l. f7 m( \5 `. Sbe made hazardous live by the failure of a creepage or clearance distance.( e# R9 o9 ]% e B5 P4 x
Decision:: J1 t4 {( ^, o0 p m% W& P U6 J
Such components should be rated for the single fault condition.' R1 V7 P9 d. g/ X5 t& _
Explanation:" F/ U5 F' ~/ Y6 O+ r
The safety of the user will be dependent on the operation of these devices. It will, however,, d; W' f4 S- i! V& C7 ?
be preferable for the design to avoid this circumstance as the integrity of the components is
& }& K1 i. \' F8 _0 C1 p) Y K# |not defined.. F$ P: q3 T' c! K
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发表于 2012-9-19 15:05
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