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| Protective Impedance
" _! X+ O' a4 C/ V! J8 N7 ?' } | 6.5.3( |) j! ?1 t. X: u. @/ y
| 61010-1(ed.1);am1;am2
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Standard:
4 s( f* g1 C P/ G+ g5 U1 SIEC 61010-1:1990
& Y+ N5 F9 {$ K( }; S8 R+A1:1992+A2:1995' k* X1 ~; ?- ^5 |" T8 z
Sub clause:
! R \ W5 S- G/ x" ^6.5.3
* U/ _1 J |; Y( ?7 CSheet n. 3001 t6 ^/ h7 G5 |5 n1 v( ]* G
Page 1(1)
/ G G2 k7 f& m+ N8 N% ] wSubject:- D+ ~: q: S: l0 J: W+ V, t
Protective Impedance( j. t5 o* t# Y4 a" j
Key words:
6 c: `2 W$ H. g& ^* [- Shock
& O" y% m/ e8 g1 j- d t- Impedance- y* S9 P. B" N" B/ L
- Protective
2 ?9 x- D2 ]8 W% d0 l: TDecision taken by7 G2 [. Y2 c/ [$ F1 Y" q6 c7 | r
ETF3 and confirmed
0 P: G1 F+ U% E: C* rby CTL at its 38th
' w/ L; s6 l/ Q# Z4 dmeeting, in Toronto- Z% B; j! ~# B5 T8 {
Question:: h1 N1 z: C% l9 V4 u5 Z# S
Where a component acts as protective impedance in single fault condition, should it be rated
3 o* U$ t# u5 Q* jfor this function? An example is a component in an accessible secondary circuit which may6 U# @1 l2 C3 V5 g: q2 ~8 w
be made hazardous live by the failure of a creepage or clearance distance. f u' S1 X& f( B# u- S. B
Decision:- o, ~$ }8 x2 @) A; t* p! _- z/ @8 a' I
Such components should be rated for the single fault condition.
8 s3 E8 e4 Y& g: ^/ UExplanation:
# f, C- |0 U) E d! d+ EThe safety of the user will be dependent on the operation of these devices. It will, however,& J$ L8 K5 c' D# a3 W9 r- V
be preferable for the design to avoid this circumstance as the integrity of the components is- }* [' S8 H: ~1 I) Y* [4 x& u
not defined./ p ]+ y* I; H( Y
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