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| Components
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9 n. _' I3 g( C7 ^/ d | 61010-1(ed.1);am1;am2$ ^: B m3 N0 j: I
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+ U$ `' G1 c! D! i8 g) sStandard:
- d1 w I. h. n( b: S% j1 @3 \( hIEC 61010- c. C$ Y# W2 B& [/ B+ I# \+ W0 z
1:1990+A1:1992+A2:1995
* A# J; N, H& B6 N m1 PSub clause:
6 Y, ]& J5 \& s7 y3 S149 }5 D) p+ G! y: o
Sheet n. 310/ o6 n1 J2 r5 _" p( k9 {3 w/ {6 t
Page 1(1)
5 M$ y$ m0 B2 m, N7 V; L0 BSubject:' Y: R- M' _, S" M" ^
Components
2 A6 y( n0 F" N8 z' qKey words:
) V& z) }) {) E- |0 z) X- Transient5 C$ v( z* J5 e$ Z. Z, H) y
- Suppressor% Y4 F! t' k' ~+ t, T$ x$ ?
- Mains9 Z: z9 H: P& S" O0 D
Decision taken by! M; `) O) ?* F; {, P6 z
ETF3 and confirmed; |) n1 q% U2 R: [
by CTL at its 38th
) e" R/ [9 B" V1 m4 k& _# Z, tmeeting, in Toronto2 I# i; U: r2 j7 u( o; b7 J
Question:! ]/ F2 Q# O! `5 s, i4 F0 a ?5 E
Is the use of transient suppressor devices such as varistors accepted in equipment and, if so,
1 k$ O) I- A: ?6 e3 Q2 _9 B5 D+ Bunder what conditions- d9 J6 ?6 f" K& b& T: h: d. \
Decision:8 j$ }7 D4 E$ ^$ Z
Varistors are accepted in the following conditions:
" m- Z8 G# c7 @ d6 N" d2 c4 n$ ^& `1 Between Live and neutral conductors after the mains fuse.
& d2 G7 i4 f6 i0 [! f& eNo component approval demanded.
7 [* y4 c2 A O' @) V$ {2 Between Live and neutral conductors, before the mains fuse.% S4 z3 c% H2 N# s+ w& A5 a$ ? W
Only accepted if the component is approved to an international standard (IEC 61051 or( g: |) c6 s* ~/ X
CECC 42200)- Z' P+ S; y9 L Z
3 Between Live and Earth conductors (before or after the mains fuse)$ ~! m# x, K- D& ^; ]0 _1 Z
a) pluggable equipment
; |" W- Z! K2 Idevices are not accepted- Y& q' r [: ~7 @% ~
b) permanently installed equipment
/ I2 a; X7 P c" s O: W) ~devices are accepted as in 1 and 2 above.
2 N3 A) |' b8 {, }( o. m: u, z3 M9 pNote: Components shall be physically mounted in such a way that no hazard can arise in the
- G, `0 Z0 C& ?* }% A/ }2 K8 Levent of the device failing catastrophically.
" w# {$ L8 S8 H$ _Explanation:
4 g4 i- S. J. H; K/ w$ U) [) q# pVaristors are semi-conductor devices and therefore, cannot be treated as high integrity
' T+ R: h; k5 jdevices and must therefore, always have additional protection.
8 [+ m7 T$ X" |, p% DVaristors in the equipment or installation coupled with safe construction and approvals meet) e' ?/ B6 @* ~* `+ f
these requirements except where the disconnection of earth is possible as a single fault. In. A- V1 n8 c. u( u; s
this case, the slow deterioration of the device with time, allowing an increase in earth% t8 S1 B' S8 G& W7 T6 ?" `
leakage current, is not acceptable and the devices are, therefore, not allowed.3 Y% i0 [6 ?8 i
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发表于 2012-9-19 14:47
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