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5 ?* c4 @& P; R0 Q6 p
2 n8 M- h5 L4 p% u' o
 DSH 300- u0 q" `* M |! w" P% L( n4 V
| Protective Impedance3 v8 E2 h% s" o
| 6.5.3
1 B% U% q; R5 g. {) { d# ~- w | 61010-1(ed.1);am1;am2
; i7 } i. s! X |
- O' w$ u, C- g' `/ x4 H2 }8 j. f2 c. W) Z3 {# F9 A! b: A
Standard:
) j9 C7 y0 g! A8 SIEC 61010-1:19906 i+ X% S7 C! E" B1 x. D9 t" j
+A1:1992+A2:1995( ]7 o" t/ D' U9 u% V% V. T! [
Sub clause:
7 F" H) f, c5 m6.5.3
6 H4 x0 o- ]7 Q& i8 ~* K2 jSheet n. 300
( m1 Z* ^; Z1 U$ b' @4 JPage 1(1)
$ s% M5 b2 ^- R0 D, kSubject:- d# A; Y0 |+ }
Protective Impedance% Y+ r5 B1 J ?- k7 z
Key words:6 R, F! p) ]# Q- K5 T2 T; N
- Shock/ h. r$ B! H7 B% R
- Impedance
1 T* A ~2 u( K% R/ Z- Protective3 B) ^; O+ n# k; W1 _$ x" L
Decision taken by+ [. }5 H% O2 B7 D! v9 B } z- \7 }
ETF3 and confirmed1 ~4 r: o% @" t. R
by CTL at its 38th. k+ W" F9 g" ]$ T C1 i
meeting, in Toronto3 N! ^9 j5 j7 s+ y- G- E# P
Question:
6 s& O2 ^7 }( K/ ?8 x$ ^Where a component acts as protective impedance in single fault condition, should it be rated( ?; Q1 k5 J0 ?2 U% [2 X/ h
for this function? An example is a component in an accessible secondary circuit which may
- r$ K. |6 t" }% y5 I; Ibe made hazardous live by the failure of a creepage or clearance distance.
( \2 |4 q) q2 uDecision:
1 j' f7 ]2 ]8 b% \# J% ?Such components should be rated for the single fault condition.
$ p1 ]- w" y$ |2 s: K, qExplanation:
4 P7 W& d9 |/ HThe safety of the user will be dependent on the operation of these devices. It will, however,
9 u5 N3 B. X& a' i. e# r Rbe preferable for the design to avoid this circumstance as the integrity of the components is
: n+ x3 C& A, j8 V- f9 q" \not defined.
. y/ R$ g6 w( _0 m b: i5 e2 B
2 t8 L0 P: @) e( g
" v8 A, h9 X% I! B0 @
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发表于 2012-9-19 15:05
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