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& c2 J6 h( m) Y F. {) H) b- o
" ?- K9 F; \& W/ _
 DSH 310
0 x8 G1 d3 z# T Y6 K# d6 c8 O | Components3 j1 T' S$ T% j; d( v
| 140 J" t6 u1 _- a' H) z" E) |* N
| 61010-1(ed.1);am1;am2+ N$ I) Z2 n6 G U- @+ z
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Standard:
4 s9 d' m. \7 H: F5 C0 k; ^IEC 61010-
, E, i* h% g+ B+ L7 e: }1:1990+A1:1992+A2:1995% ~) [+ p/ f- `1 M$ a& j# x$ C
Sub clause:0 A5 c0 E$ s* y, ^
14) l/ x+ @0 e7 b" H4 Y/ N' m
Sheet n. 310
2 R3 {2 e. f& OPage 1(1)
) L2 k& m, o+ k. Z: g7 a1 a uSubject:+ \0 E; m" N# h% Q6 J3 W7 ]
Components! m8 w3 [2 a+ z) W7 z! q
Key words:0 S" Z o# e6 h5 h
- Transient9 L# @* n8 M$ M. V
- Suppressor. \: n0 t% G- x' L1 Z9 ^3 p
- Mains
7 a, e1 `+ D6 D4 X* B4 h I$ QDecision taken by
}. ^* p- l3 v/ xETF3 and confirmed
- s* f6 D! q& ^+ ^( iby CTL at its 38th/ b, F3 n b1 Y/ e) D
meeting, in Toronto
# Y. l' ~1 w: [2 Y# iQuestion:
@3 n. e, |' rIs the use of transient suppressor devices such as varistors accepted in equipment and, if so,7 |2 m6 f, |" D9 ^- r1 `
under what conditions
, d4 L/ L r1 `) O# Z" t2 R% |5 c1 l# EDecision:
. l' g% g0 y' `1 |Varistors are accepted in the following conditions:+ X$ u8 }6 g- g Y$ f \1 H
1 Between Live and neutral conductors after the mains fuse./ Y' e% G. J' r% I# k' a% K
No component approval demanded.
0 d8 `7 ^* j" ], J- H/ ]- u" I+ R( j4 n2 Between Live and neutral conductors, before the mains fuse.
, x) Z* d6 P! \( u OOnly accepted if the component is approved to an international standard (IEC 61051 or
, U( h6 _2 K/ hCECC 42200)1 B6 z1 `/ C* H
3 Between Live and Earth conductors (before or after the mains fuse)
, ~5 p, f5 g- U: `4 I3 E, Ta) pluggable equipment+ G! D- J6 z5 e: q: I0 t
devices are not accepted
$ _- a2 E& E( Vb) permanently installed equipment
+ e: b& ]: J- h5 ^' T/ X @devices are accepted as in 1 and 2 above.
& G: C( d$ j( D* E* l7 c2 {3 eNote: Components shall be physically mounted in such a way that no hazard can arise in the
: E! G. r$ P" K/ Fevent of the device failing catastrophically.: @% W: P1 J% {% p0 {% ~
Explanation:: B" Y: A* o6 ^
Varistors are semi-conductor devices and therefore, cannot be treated as high integrity; E/ o2 \2 @ g9 k% y, {
devices and must therefore, always have additional protection.
( Z- F1 M" g/ h5 p/ w9 hVaristors in the equipment or installation coupled with safe construction and approvals meet
& D* f+ Y# W# @2 bthese requirements except where the disconnection of earth is possible as a single fault. In
9 a) z3 g8 D o+ U- Jthis case, the slow deterioration of the device with time, allowing an increase in earth
0 q$ c9 `# I1 I8 z. t" [leakage current, is not acceptable and the devices are, therefore, not allowed.
$ q8 u+ ^& H6 ]( F! I( n, c- V# N1 P6 b
. V0 B: s/ r9 e
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