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3 u) E3 @/ h+ A+ M
| Protective Impedance
. D- P3 V8 U' b3 E% h9 @ | 6.5.3" }2 f, n) ~, w5 d- t7 P
| 61010-1(ed.1);am1;am2
" U7 v2 `; K. t6 W" p# O |
8 P" S' P! O2 ~% g# W. h
, U( E7 f2 C" f: u7 k3 \
Standard:
* M- D8 S8 H" z% ^& GIEC 61010-1:1990+ f- C; ?1 V, Z. Q. W
+A1:1992+A2:1995
# L" L+ R$ X- T. L! ?Sub clause: K9 A( O2 h8 X3 K$ B) }6 A( ?6 K! v6 c
6.5.3
( P3 }1 N1 n- S% ISheet n. 300
- e/ r: M5 |3 y# kPage 1(1)7 S; H" N# p4 Q# t* G
Subject:! V1 s" L2 A. b8 @
Protective Impedance
! G3 G7 c' [9 s! H: ^& j8 pKey words: r# L9 c7 j3 y3 C
- Shock
5 ?* B! I7 J6 [2 N0 b- Impedance _ O3 i# ~: d( n2 p8 j7 G2 ~( Q/ F
- Protective- S v0 W3 G$ r% {, _! {" e8 O' ~
Decision taken by
: y7 G& k3 n# m% S& _% KETF3 and confirmed
5 G' [! H. |+ k( {3 |8 |by CTL at its 38th
" E& A8 E9 }6 O0 u5 I3 A* w3 ]& imeeting, in Toronto
% c) n3 ?$ i- M0 N( V8 ~) P* \$ uQuestion:4 x0 P" I- K& T$ Z- A
Where a component acts as protective impedance in single fault condition, should it be rated8 L7 z/ }9 |; n
for this function? An example is a component in an accessible secondary circuit which may
4 K7 t- A' q" Q W8 Z5 T8 A! zbe made hazardous live by the failure of a creepage or clearance distance.9 @" B2 r c( s, w+ A& B* v0 m6 g
Decision:
3 E% @, A8 a2 r3 N( v% m4 MSuch components should be rated for the single fault condition.
* q0 V( @0 ^2 T p& e9 d- mExplanation: x" z- K$ X) d, K6 c5 d
The safety of the user will be dependent on the operation of these devices. It will, however,, B1 G4 R$ b2 [+ K$ E! Y7 k# r
be preferable for the design to avoid this circumstance as the integrity of the components is% @: d8 M$ ~* d5 s/ j
not defined.
. g0 T' K* G/ G& c+ D' n; B2 k2 f0 Z: D4 a
, G& ~0 T( j) X1 }( z
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发表于 2012-9-19 15:05
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