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' I" I% o4 X( S# v
$ l4 r3 k" }( u( N9 d) Z | Protective Impedance2 F; q" Y9 n" W( X
| 6.5.3
* o1 e1 H" A7 y+ V4 P' H% h1 m | 61010-1(ed.1);am1;am2
" U: J) N9 \9 P0 L& |/ u |
7 o* S# A/ v1 Q, o& K
7 N+ c0 A! p2 N- T$ bStandard:
* {+ A1 U# V. w+ m- `IEC 61010-1:19907 M5 A% Y; G& f7 r+ `* l
+A1:1992+A2:1995
3 U8 W- m9 C: G% Y FSub clause:& D$ E8 ?! U2 Z% b# S% r
6.5.3( Z& a% O* d& {
Sheet n. 300
4 D6 {" W3 D6 s( Z( O6 iPage 1(1)
- m( f7 m1 d3 {7 v2 CSubject:
( i0 Q( ]/ w8 N) n6 y7 OProtective Impedance
|8 Z' n5 D. i7 \) qKey words:2 U* ~! R" ?% M5 K% J
- Shock
" h \+ w2 o) X1 \ E( x# {; h R& y3 z9 I3 F- Impedance$ Q/ [& c0 m8 L: Q" B
- Protective g3 B$ Q8 z% [3 L
Decision taken by
* {( N" N, i7 r' |9 [ETF3 and confirmed
% \) C, Z) m% x7 X% O) i! e" @by CTL at its 38th
! W$ s# [; W; n7 ?# P% h+ B9 Z, Z2 Cmeeting, in Toronto
9 p7 }/ U( j& SQuestion:9 U2 Z. T& _5 c A& r& E6 ^6 t( W3 M0 `
Where a component acts as protective impedance in single fault condition, should it be rated( v) x6 c1 |) S
for this function? An example is a component in an accessible secondary circuit which may
9 n" ]$ i& v. P5 }+ G" dbe made hazardous live by the failure of a creepage or clearance distance.
* J" B9 Z5 f, J+ q }$ HDecision:
k" L) G2 U9 }9 ` mSuch components should be rated for the single fault condition.; S1 V1 b# }- E
Explanation:
8 _3 n9 _- E9 \3 |The safety of the user will be dependent on the operation of these devices. It will, however,
6 n4 @+ e4 _# S# V5 V6 H1 j- Obe preferable for the design to avoid this circumstance as the integrity of the components is
' y* {0 S7 g# M" Y! G0 Mnot defined.! h% @6 @; u' V" n
; H' ?0 ]2 a8 T: m9 T% L& q
9 Y7 ?* f, y- l
+ I Z3 D& B/ C2 V) Z& v% z( i& j |
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