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3 d: w( t, v0 O4 b$ c8 s
. ]- M# P+ r6 [" v9 X) [' F | Protective Impedance
" C9 E0 B1 M$ c9 R9 L$ D+ e) D | 6.5.3 A/ u" |+ Z# a5 z" N
| 61010-1(ed.1);am1;am2
% w! y7 }; k1 ~9 W7 t; O6 ?# e3 S |
" O9 {3 C! \4 ?7 x! x j
( X" X: \2 k' V$ F- @5 M9 oStandard:
% H+ E( ~% H/ e$ x* z& V6 _IEC 61010-1:1990. K# n' W5 l* R& t1 e
+A1:1992+A2:1995
4 |# ?0 m" Q1 O- RSub clause:! ^+ F7 u4 z, i* `: I3 k& C' I7 D
6.5.3% j" Z; W' h% j- y$ j6 f. M5 d
Sheet n. 3001 E. o* Q% _3 L2 U- G
Page 1(1)
# e: b- |8 D' B% hSubject:
) N/ H3 W- h" \6 ^Protective Impedance
: H' P3 C2 o' a* l% I# ?1 @: dKey words:
, L! C# q6 |) l& {- Shock
s, p. @7 S7 Q' L/ o2 E* W- Impedance
: y6 ^; t3 O& V/ H, c$ Y- Protective5 H1 I$ H; _' C
Decision taken by
" _4 E8 T: e1 k+ @8 t* ]ETF3 and confirmed
+ e, Q0 h, f5 x8 mby CTL at its 38th( C% g% u1 U$ \" @0 V' F
meeting, in Toronto4 b" B3 ~0 r( L4 W2 H; `
Question:+ Y3 d8 @9 G- e- l6 b8 A' x0 b
Where a component acts as protective impedance in single fault condition, should it be rated
1 B! L9 U8 Z5 h- i8 s( zfor this function? An example is a component in an accessible secondary circuit which may
" d% [: A- M$ o" I. |( A* Jbe made hazardous live by the failure of a creepage or clearance distance.
3 ]( @" g8 i- q; g$ I* G- }Decision:7 p& }4 e Z0 I* E) K5 x _# T% b
Such components should be rated for the single fault condition.
: i. |9 R% D' hExplanation:
- _* N1 o6 a, @ dThe safety of the user will be dependent on the operation of these devices. It will, however,* L% Q4 \ r3 ^7 k: \& N6 f
be preferable for the design to avoid this circumstance as the integrity of the components is/ H u# C, f* W& i1 i
not defined.
. ~ \! w. _& m. G4 m, E; _) h" \8 [4 Q' K. {
% _4 H& i. e% B5 @7 E+ B& K4 O: m- t7 K5 T( v* F6 G9 N u
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