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, q+ n4 i( n, b0 y3 ^1 d1 V$ f) q3 c5 _
# G- a+ A A: D4 ]( q+ m5 N | Components
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, d5 C. ]8 ~( K% ?* ?8 r6 ? | 61010-1(ed.1);am1;am21 ]& L+ S! v& e$ W$ w
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' H1 b& p0 a& f0 f! bStandard:" Y8 W# f6 }( q6 n! \
IEC 61010- E* v# T( [5 J, u
1:1990+A1:1992+A2:1995
6 g2 z- }2 Q P5 Z$ {. ?Sub clause:4 u. [4 x0 b& q* P
14! b' l- X# A" Q, n3 I- |4 j1 l( |! D
Sheet n. 3106 z) N! V J" r. {
Page 1(1). k. J/ V. o, H, J
Subject:
. ?) a/ w3 R+ w5 A8 j1 e h5 XComponents
( b) m; b/ I+ ]3 l* e) rKey words:8 h4 a( P- _& O9 H7 _
- Transient
& D! z5 M4 _3 \2 {- Suppressor+ ?6 P/ r5 e2 z+ Q
- Mains- G. V; Q' c% z+ v, b+ w
Decision taken by
* Y4 q( J4 W8 nETF3 and confirmed
0 h3 k& y# v3 }5 E9 x7 v6 J& dby CTL at its 38th
# q- n# W+ b+ a4 g1 \meeting, in Toronto
; i7 L$ J# \9 }8 r9 ?6 bQuestion:
$ [: J1 v8 e0 V5 _Is the use of transient suppressor devices such as varistors accepted in equipment and, if so,) B& N: ~! N: W5 n
under what conditions% ^3 s( Y( |+ U; b, Z1 A. ?1 ~
Decision:$ u+ z& q" G+ d$ l$ ~! Z$ N
Varistors are accepted in the following conditions:/ o, t3 u. T1 h& N! P. C4 x$ h
1 Between Live and neutral conductors after the mains fuse.
* U9 a# |8 A- f, m; BNo component approval demanded.6 X5 J5 x" A; \: o, Q
2 Between Live and neutral conductors, before the mains fuse.6 D" V$ M. [/ f$ }
Only accepted if the component is approved to an international standard (IEC 61051 or
6 ?* z7 I% S4 }3 w7 DCECC 42200)0 a2 c( r+ N t2 L$ B B
3 Between Live and Earth conductors (before or after the mains fuse)
- c5 F( k- H: g6 B' _a) pluggable equipment* n E* R! k# s8 Y8 a9 m" ]
devices are not accepted7 P+ g4 Q2 \: h
b) permanently installed equipment% B6 s2 v0 g6 v3 Q8 p! l& w
devices are accepted as in 1 and 2 above. m6 A7 E2 E$ S8 a
Note: Components shall be physically mounted in such a way that no hazard can arise in the/ L8 U# U- \4 `' b$ D
event of the device failing catastrophically.
( ?! J" ?9 j+ {% oExplanation:
$ y* S. T. Q( dVaristors are semi-conductor devices and therefore, cannot be treated as high integrity
4 |( T1 Y r' u- ^% Q7 L; a: U5 w& ldevices and must therefore, always have additional protection.3 |' v' |( N- {. F3 \3 p
Varistors in the equipment or installation coupled with safe construction and approvals meet1 g, m2 J) x: m0 e7 F
these requirements except where the disconnection of earth is possible as a single fault. In
3 ~' r1 }3 H/ r+ M8 c% w vthis case, the slow deterioration of the device with time, allowing an increase in earth
, n+ V$ {2 |! ^1 @2 ?leakage current, is not acceptable and the devices are, therefore, not allowed.
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发表于 2012-9-19 14:47
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