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|
/ P7 Q N# n. i, D
' v; p+ ~% T+ ?& |
 DSH 3009 |6 @& i1 C* P: _- f, r8 g5 |
| Protective Impedance6 x" Z, d* Z& [1 A4 p) @$ F
| 6.5.3# u, I7 D/ ^: f% n( `8 g( l7 t
| 61010-1(ed.1);am1;am27 E( d& \5 K( P) o8 f% v+ G
|
1 A. C+ f2 c1 Q9 Q* U7 v& J5 x+ U; r. {+ V6 F
Standard:
/ Q. K, c/ Z9 a* y$ _4 p) f4 q$ fIEC 61010-1:1990# T1 ~5 C5 ]/ }
+A1:1992+A2:1995% B( ?# M( w% s; K6 w, m% m
Sub clause: b* _" [. F* N" @
6.5.3. u9 @0 C1 z, [4 T5 @, P
Sheet n. 300
- H9 D* C! X) {) ?- Q+ ~) w' P/ bPage 1(1)2 o& d0 H& U- Z/ t0 D% \% P
Subject:# V. T# t' S+ B5 `6 @6 I( s
Protective Impedance* ^ c* V K3 T% P) b9 O7 L
Key words:; {) |& ~3 T4 x; H
- Shock% V% \( \- N& M5 \
- Impedance
- A4 t$ q; ]; H" s T. p- Protective
; W4 |8 [2 `6 L5 @& yDecision taken by; V! Y+ }, Y6 }- |2 K
ETF3 and confirmed& Q8 @6 d) B, \, w. c% x' @: x2 ^
by CTL at its 38th3 c/ \) V% ~* k/ s: P: N" S1 u, |1 n
meeting, in Toronto1 H/ ]- Q, X& T1 R5 M
Question:' _7 I; R& L2 H: H# [3 V" o$ }
Where a component acts as protective impedance in single fault condition, should it be rated2 h3 p# i# Q3 U4 w1 V
for this function? An example is a component in an accessible secondary circuit which may
9 P1 W, a U' J1 X' N$ Pbe made hazardous live by the failure of a creepage or clearance distance.
, Y; l9 o8 P% a2 ODecision:7 N9 V7 u4 J7 r0 W$ z. u
Such components should be rated for the single fault condition.: r. o! }( E4 C6 h) K3 }" s9 n
Explanation:- F2 j$ L8 h+ n- Y" T
The safety of the user will be dependent on the operation of these devices. It will, however,/ E! {" P) A- q# \8 Q8 o- U
be preferable for the design to avoid this circumstance as the integrity of the components is$ n. N' Q7 _$ z. i8 D9 r+ n
not defined.! u* j; P( Q0 V" T. x: M
! P! }7 i, b& Y+ o0 ]8 K, \9 \# l
0 T. |$ b# U0 m, K4 A9 S4 V" T
& f% R0 _' h3 f/ H |
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