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: w: j9 c7 O* ]# t6 u7 D2 v1 ]. B8 d: Z! J( k" J! B, P* U7 C
 DSH 310! H8 `' \" \0 p& Q, Z, _7 T5 C
| Components5 T$ G. ^+ W( d
| 146 `; r4 p. m/ u) W4 ?( T
| 61010-1(ed.1);am1;am2
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Standard:& r% T/ b( _8 J
IEC 61010-
; m+ ~% u0 H. L' {$ H; b& [1:1990+A1:1992+A2:1995
0 B; s3 ~. @+ O/ x( ZSub clause:) ?4 w* M: K6 w2 k
14
: {6 u0 j+ ^+ k8 o+ lSheet n. 310
; A+ m0 K% L1 v% BPage 1(1)! }( |8 z/ s) r8 D; g
Subject:1 n9 e& T* `9 M" Q1 o8 I
Components
; M, F6 j3 [9 \) ~ YKey words:
! Q" g2 n% j9 P7 l2 E- Transient& J5 v+ T- T' M
- Suppressor
1 S4 k; C9 g5 Y+ B( y" \- Mains7 K' n% n5 I9 O
Decision taken by' d+ A" ]# r! y' i
ETF3 and confirmed
( j- E6 T+ J+ N+ Tby CTL at its 38th* o; V' i& [0 b2 W
meeting, in Toronto
( w. E5 P. M' C9 j/ K) qQuestion:8 m& J. U+ J, c9 J6 w" d: O: y, _
Is the use of transient suppressor devices such as varistors accepted in equipment and, if so,
% J2 D | B# F; A. tunder what conditions
, C9 Y2 D+ A V% t. \Decision:
+ n6 U4 W, G0 F* V3 o3 d. LVaristors are accepted in the following conditions:8 T& N7 C& u! O4 a+ K" M
1 Between Live and neutral conductors after the mains fuse.
/ D0 E6 b: S" Q2 aNo component approval demanded.
/ M2 T+ M" [+ W2 Between Live and neutral conductors, before the mains fuse.; }" P& w2 \/ E4 B. H( H' v
Only accepted if the component is approved to an international standard (IEC 61051 or
$ @; P1 s9 x v1 O4 p# wCECC 42200)- ] L9 z; e8 y+ c0 X6 ]
3 Between Live and Earth conductors (before or after the mains fuse)9 H" ?7 g+ w7 b1 m) X
a) pluggable equipment
' S9 J$ P) Z7 Z, kdevices are not accepted' k: ]3 @; j0 z9 v* R4 F
b) permanently installed equipment
: v' J" `9 N. K6 g6 _) Wdevices are accepted as in 1 and 2 above.( o* Z0 l( r# [
Note: Components shall be physically mounted in such a way that no hazard can arise in the
( h( b6 K! z# v- r/ `- Q: Fevent of the device failing catastrophically.
/ w4 v% i3 \0 ]Explanation:0 \) K) O0 L; f+ r4 q0 X+ R
Varistors are semi-conductor devices and therefore, cannot be treated as high integrity. L9 e. `2 K, m; Z: n% E u
devices and must therefore, always have additional protection.
1 o5 W7 \3 Y, Y4 UVaristors in the equipment or installation coupled with safe construction and approvals meet0 o- K1 D# Y6 S2 e$ ?
these requirements except where the disconnection of earth is possible as a single fault. In: T9 j2 V* d0 r
this case, the slow deterioration of the device with time, allowing an increase in earth0 N2 c" v6 m. z# I. X) i- d
leakage current, is not acceptable and the devices are, therefore, not allowed.7 G+ H4 L' O1 @9 J' l
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发表于 2012-9-19 14:47
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