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| Protective Impedance
7 ^- Y( V3 s: u | 6.5.3& W. r+ W8 ? m" F2 ~
| 61010-1(ed.1);am1;am2
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8 K% o1 j, s1 t; m( KStandard:
% P; x' r& F$ X- ^, o* KIEC 61010-1:19900 `: |: a7 V$ ?% I1 t; T/ j
+A1:1992+A2:1995
1 Z& u) f; h; P- `( {Sub clause:8 d' I# w' x+ {6 G
6.5.3
8 R+ o7 V) \: p# R& NSheet n. 300
& w6 @) p- U1 L% r- Q8 HPage 1(1)" H/ g+ ~" Q( J* z9 C! L
Subject:3 G/ m9 [3 ^# @) l; G
Protective Impedance" ]; w) p9 `- F3 [' d* r
Key words:
" C G2 h9 i. i/ W! J: T8 F- Shock
* e& W( o/ n$ m! F6 M' W4 J& L- Impedance1 x5 y! s1 G- u2 o% Y6 u1 F. ^8 M
- Protective3 }, y; O0 Z. a1 ~
Decision taken by
0 K1 q8 ]! o% r cETF3 and confirmed# G6 C+ b$ n8 G: V
by CTL at its 38th6 x! e& k) j' o2 z. r ]
meeting, in Toronto
% r1 ~+ I3 i# e0 ?( B* D) H; AQuestion:
m2 k# b6 ?* Y& i7 eWhere a component acts as protective impedance in single fault condition, should it be rated" w# h0 S# D7 T
for this function? An example is a component in an accessible secondary circuit which may* k* Q. a0 r( g
be made hazardous live by the failure of a creepage or clearance distance.
8 m. ], }( h( j7 X8 H& zDecision:+ U0 |! s! O0 ~' t
Such components should be rated for the single fault condition.
: ^4 u) F. k7 ~' m% C& r; P& wExplanation:- M. z3 H* g. J3 F' \
The safety of the user will be dependent on the operation of these devices. It will, however,0 m7 {8 U% F1 n' p1 o( n5 `
be preferable for the design to avoid this circumstance as the integrity of the components is
; l/ d5 p$ w; i/ x" I- tnot defined.
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发表于 2012-9-19 15:05
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