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/ ^- N9 U6 g# B) f* y! Z" {1 U. F: F
| Components+ j; {5 D( B0 a# J8 o4 C
| 14
5 ?+ e4 ~/ Q$ S( v& J n' F- V( M4 ` | 61010-1(ed.1);am1;am21 _! h* ^; G& L9 Q4 p' u$ G6 f, F
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6 a5 M. Z. ], g0 n
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Standard:
8 [, T; t* v) U: }# J) jIEC 61010-
/ u5 x( p* t0 K7 x' z1:1990+A1:1992+A2:1995
# L' K! x' m# v6 b7 T( H& T# mSub clause:
! \5 ^( z% J1 X4 {$ `3 ~14
5 Q0 R" q# T% }7 qSheet n. 310* x2 Z1 r7 o7 q
Page 1(1)
, P+ w7 Z5 A: ^0 i) ?- ESubject:
5 }/ J/ q) b; [1 d; S" {Components5 `; G5 }6 c% Y* t5 Y: Q! e
Key words:
/ T' f9 f$ T3 U5 x- Transient
7 ?; Q4 ?6 d$ u+ x- Suppressor( h) ^! w; ]& N3 |( R( `% a
- Mains
( D8 L2 P8 A5 GDecision taken by& _2 V8 }* B8 I8 J) R
ETF3 and confirmed
6 Y% g( F- j) T8 f& F, X, m" kby CTL at its 38th
! I g% v3 g1 N# L5 Y9 }+ D. [meeting, in Toronto, n1 w! C9 ?1 Q
Question:
' H( a. i. X. N, ~7 Y( y7 q- QIs the use of transient suppressor devices such as varistors accepted in equipment and, if so,
' C9 q& t: j* J E# B- X Eunder what conditions/ t: m' C. _. ]2 G0 ]2 V, y1 h
Decision:
; E; p1 t* B. GVaristors are accepted in the following conditions:0 J4 d7 z9 x4 v
1 Between Live and neutral conductors after the mains fuse.
* y! x! K0 J4 Y; Y( n7 I0 E0 fNo component approval demanded.7 |; m& U) t8 d/ V5 j1 l
2 Between Live and neutral conductors, before the mains fuse.4 |0 B/ S! u! S# x/ I
Only accepted if the component is approved to an international standard (IEC 61051 or
7 ~+ e0 Q; T3 @, _) g' H) fCECC 42200)! C1 q# V1 ~* r7 w+ f
3 Between Live and Earth conductors (before or after the mains fuse)
+ }, J6 ]4 m4 B5 q- x: Ga) pluggable equipment |* A3 D2 q; {8 B4 ?" K" s
devices are not accepted+ Q& y5 W% G+ a" e" p: S3 r
b) permanently installed equipment, B: f1 L/ B) o( a. W
devices are accepted as in 1 and 2 above.4 E, @# _( l) U
Note: Components shall be physically mounted in such a way that no hazard can arise in the& U1 r) J- y- {+ P* U
event of the device failing catastrophically.
2 e3 q4 |: @/ a1 N4 w5 NExplanation:
' {# E0 z4 P5 H( c9 U6 I! m% ]Varistors are semi-conductor devices and therefore, cannot be treated as high integrity5 N9 K. F: @2 L! ?7 ~5 `
devices and must therefore, always have additional protection.6 H* P+ s% W% ?% ^# [$ N
Varistors in the equipment or installation coupled with safe construction and approvals meet
3 D) G; d& D# t4 l8 }% o* e2 Kthese requirements except where the disconnection of earth is possible as a single fault. In z% S I& ^7 C/ I9 ^0 F4 ?; [
this case, the slow deterioration of the device with time, allowing an increase in earth) W# ?; ?/ B# }1 r; o$ A w
leakage current, is not acceptable and the devices are, therefore, not allowed.* Q) \2 k T) O" w' y k8 V/ C3 }
) {+ s2 Y0 }( m# P+ b: [, r- W
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, {# g z$ W; J0 Q# Z: {4 S |
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发表于 2012-9-19 14:47
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