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 DSH 310
* p8 ]( x/ _2 F R& h# C, o& { | Components! c2 b& K. E) Z" e& ]
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1 K8 B- E" J; `4 p, w5 W+ Y; r | 61010-1(ed.1);am1;am2
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. r' [' h+ A* ^0 O! l# TStandard:6 p W r t( b/ w$ i) j
IEC 61010-
% S8 W; N1 E- k+ H, d1:1990+A1:1992+A2:1995' E* n! |+ p6 N0 z- [" t0 Q
Sub clause:
1 L3 f& v# q$ q U8 R; u14
. f' l+ F$ V* _1 ~$ P3 xSheet n. 310
. j/ Q- J( K4 R6 ?: w1 ~4 J kPage 1(1)* j2 Z+ a! N2 D( C$ M
Subject:
5 m' K- c& k+ @0 `$ uComponents. @& G0 f f. {5 n7 \! P, Q
Key words:7 B# I( }5 u/ j2 f, h/ p$ t2 s
- Transient! z& i+ S ^! o _
- Suppressor6 Z5 B- J* C S" L, a
- Mains
+ X9 X' A& H8 Y# I8 NDecision taken by
$ z0 N/ D) n1 NETF3 and confirmed
' M% n1 Q$ s5 L5 aby CTL at its 38th
3 e7 Z. O( |5 zmeeting, in Toronto4 |+ ~9 m4 t% Q4 B
Question:
. @9 Z! f9 A4 V' G+ W+ zIs the use of transient suppressor devices such as varistors accepted in equipment and, if so,
# q' {" D2 l$ v& U) y6 [under what conditions
: L9 z( F- x5 Z$ j% W& V) @. ~Decision:
8 y' H0 h& z1 b& w9 D6 w, MVaristors are accepted in the following conditions:9 Y( _9 }. i2 ]/ q3 g" ?7 V; ?+ E
1 Between Live and neutral conductors after the mains fuse.( K: B8 E- ]7 _: S$ ~/ `0 h
No component approval demanded.5 s# X+ X- E1 N* C" t; @
2 Between Live and neutral conductors, before the mains fuse.' m y# d/ U) H. N8 U+ t: t
Only accepted if the component is approved to an international standard (IEC 61051 or3 a' b6 v5 V+ {" ~9 t# Z7 M5 V
CECC 42200)
d A, H# [9 Y) k7 q: \' `3 Between Live and Earth conductors (before or after the mains fuse)5 l- ?, q, w3 ~8 F! N. r0 d
a) pluggable equipment
+ g3 ?! h |0 Q* E: h) m6 t. edevices are not accepted
0 k. O! P. Z0 W `9 I* C7 tb) permanently installed equipment/ X" ~. I' _+ |0 q: ?
devices are accepted as in 1 and 2 above.
' Z" B/ ^- A( Z& E' `Note: Components shall be physically mounted in such a way that no hazard can arise in the
- u* |7 N' D4 _3 v8 Q0 cevent of the device failing catastrophically.
+ A( R1 ^, D" qExplanation:$ {: N/ d$ t9 \6 y: H) B* z
Varistors are semi-conductor devices and therefore, cannot be treated as high integrity
( |+ ?, p$ e) X0 H! @. rdevices and must therefore, always have additional protection.
6 ^: S% Y2 s. U6 \7 a1 }+ nVaristors in the equipment or installation coupled with safe construction and approvals meet. i! D. X. ^: x9 J2 R1 K
these requirements except where the disconnection of earth is possible as a single fault. In7 r0 u- Y3 L+ W6 }+ P
this case, the slow deterioration of the device with time, allowing an increase in earth
3 G! O$ G- Q+ X& C: ^5 g7 rleakage 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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