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! x/ T$ A: y2 q+ ~3 z0 D
) D4 c/ B+ s! c, A- _' Y
 DSH 300" F$ R) m0 g0 ~$ K z. y" L9 _
| Protective Impedance
! k' q$ L* j6 ~" `5 h, S | 6.5.3
' L9 l. H9 |# c: Q& j7 b | 61010-1(ed.1);am1;am21 ~ _8 J. P9 z7 W1 ?- \6 h/ I1 s% E
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7 f/ r6 v0 g8 S- }9 r9 h
) ?, ~* a5 V6 ^% `/ U3 MStandard:
, B2 A% }6 y3 n& L9 b/ _IEC 61010-1:1990' V3 x! D/ n; k) j6 J( N
+A1:1992+A2:1995
) D6 l b N1 U; R4 o: Y6 ?Sub clause:% f+ Q& F' U3 g$ m+ h
6.5.3; N3 w' J) e' P) {+ j% L. t8 a* M
Sheet n. 300/ F, @6 {7 g# Q8 L
Page 1(1)
" F$ U* i3 M. G: R$ ^) lSubject:
" H' V3 Y0 R' ]7 y: ~Protective Impedance0 u7 W4 N1 E% e1 `" y8 f/ I
Key words:
( z+ N9 E/ t' ]$ R ?- Shock
( r1 o0 V9 l9 |2 M! k- Impedance; P6 `# D I6 Q7 O* N. B# ?: T1 M/ U
- Protective
( N/ v; P7 y2 D2 u( RDecision taken by
( u- U) |' p& e* ~1 a) IETF3 and confirmed& c5 E( t8 K5 _9 d
by CTL at its 38th7 z5 o$ \6 U% b) I) U, _- k
meeting, in Toronto
6 i( r( ?, P! Q$ C0 ]Question:6 s5 |" R$ ~8 l) C y
Where a component acts as protective impedance in single fault condition, should it be rated
/ m( l6 W/ u& \for this function? An example is a component in an accessible secondary circuit which may! V7 w' q5 v7 u0 d5 s. O
be made hazardous live by the failure of a creepage or clearance distance.+ ]$ {( v& g/ g( `
Decision:
( Z' ?. w8 A/ h+ i# v2 S; TSuch components should be rated for the single fault condition.
# S0 F/ M3 r4 }& {7 pExplanation:3 r$ ^/ e; t2 X, C9 Q
The safety of the user will be dependent on the operation of these devices. It will, however,5 q9 u1 I D1 g9 v/ w9 D' `) v
be preferable for the design to avoid this circumstance as the integrity of the components is7 s; q0 w8 G2 |( q9 K( S* R
not defined.: w: @5 J; F0 {' l
' \+ P# D5 n' r9 d1 L
; f# m) N- ?- J. O8 Y2 ]! r; M* Q/ A4 m% ~- f
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