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; M; Q+ g6 l9 ~' y. O" J9 `/ k B) M. A" P0 |( E
| Protective Impedance
6 g9 \7 n" V/ _$ Z, o: i3 X | 6.5.3
9 Z( e0 g3 ^" p) V2 N& N+ K$ Y! H | 61010-1(ed.1);am1;am2
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p2 { y1 j. d% `1 [/ {, \: zStandard: e; G4 `8 o+ Z
IEC 61010-1:19904 d$ f8 |9 ~) ^- O8 d% x" D- `0 h
+A1:1992+A2:19959 q9 |3 N! ^, B+ j0 o u
Sub clause:
6 n! I' X0 C1 g: d6.5.3
3 y; M# i( ?7 e9 z7 w- ]Sheet n. 300
/ d' M( x* ?' T% C9 ]Page 1(1)
: Q) F( g- n0 M5 I- R9 kSubject: E7 i% Q& O1 ]: F z6 u7 m
Protective Impedance& N" k. y( ?9 e c9 e' G
Key words:3 s. |5 K M: H
- Shock
6 \" f n, X, |% i- Impedance, o0 z! J* {" m8 A/ ~! l9 n: W
- Protective7 i/ k2 i& S6 d5 M G
Decision taken by
: V& Q6 k8 i6 ?% n' bETF3 and confirmed' Y& L! Z2 A9 m! U9 H0 B$ O
by CTL at its 38th
% t7 f! y1 `3 f* Q* ]1 wmeeting, in Toronto: Y2 K# [: U3 k0 s( k1 A( U
Question:
/ G8 |7 n! F3 ], U/ h- WWhere a component acts as protective impedance in single fault condition, should it be rated
7 F) _& s) a5 {4 c# `: k; \$ [: Zfor this function? An example is a component in an accessible secondary circuit which may, |- n. t _" q
be made hazardous live by the failure of a creepage or clearance distance.* t9 l$ A* Z3 [. C* l6 g+ o
Decision:
3 M; ~2 p1 Y! MSuch components should be rated for the single fault condition.
6 H6 ~) u2 M2 t: g2 f9 k4 oExplanation:0 x* K2 X! p3 r6 m4 M
The safety of the user will be dependent on the operation of these devices. It will, however,& u# t% s% b/ f( o
be preferable for the design to avoid this circumstance as the integrity of the components is
3 w, h/ h. [1 }9 Y |+ R. Qnot defined.1 g+ |) T0 D% I) F2 w7 Z6 c
* d2 ] N u# v+ D$ n5 F8 T% h: F- A
. Y5 D, e( _5 L6 `; o% `/ Y+ ^6 s+ m- p! Y* k) d6 E
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