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# f; r" M9 P6 u: Z7 |7 k- Y* W3 V; K% t4 c: k, [3 x1 A
| Components
5 }. w+ f' z8 l/ f" {* O! ^ | 14
7 {+ |5 E6 Y, C# }" u( ` | 61010-1(ed.1);am1;am2
6 b5 \5 [4 F3 q/ E |
( ]/ o' e/ Z ~; f- g& v& v2 `1 S9 a5 X) B& l9 V
Standard:- a, i( I( K3 `0 H; z9 R& h
IEC 61010-1 w) z4 x4 f2 e" @- R& |
1:1990+A1:1992+A2:19958 G" ~6 W6 M/ b7 I5 y# _. K% m$ v
Sub clause:
) q3 g# `' h. i4 n14
@. P6 |% |6 qSheet n. 310
8 u# R: X" }% ?2 J: f; b4 g4 _( KPage 1(1), ~7 \9 j4 \& `* O
Subject:
3 v4 G0 c2 I; G \/ e4 eComponents( s* L z* o7 b
Key words:
8 `7 T2 [3 m* }! E, |- Transient+ g! O8 ?- n1 \ ]/ R- W
- Suppressor
( w X0 Y( r0 f x' i* Y1 ?- Mains; |! x7 F7 ~6 [( K
Decision taken by. E. Y0 y$ n' q2 \
ETF3 and confirmed
: E! r, y; b& eby CTL at its 38th: @, z) h$ H6 H1 \. C
meeting, in Toronto6 _& r8 Z2 @3 {8 ~
Question:3 t- I5 _5 a, \
Is the use of transient suppressor devices such as varistors accepted in equipment and, if so,+ A) N1 N1 U# C z+ z' ?- N7 a
under what conditions
- Q; v9 h- Z( G @1 QDecision:
; r3 t+ t; b6 C. ?: }Varistors are accepted in the following conditions:/ E' V8 Z6 ?0 w; d
1 Between Live and neutral conductors after the mains fuse., _. X; h( Q# F' p! a; E
No component approval demanded.
' @2 K1 X' W" F2 Between Live and neutral conductors, before the mains fuse.
6 T D, i) F% q% XOnly accepted if the component is approved to an international standard (IEC 61051 or
% U: G5 Z# K4 \9 C$ FCECC 42200)5 ?, D/ q, L5 N- J Q& j. F
3 Between Live and Earth conductors (before or after the mains fuse)" t4 O9 m8 A" L5 g
a) pluggable equipment
7 G) C/ B' {, T) U) D& N8 Gdevices are not accepted# H6 i9 ^) i# u
b) permanently installed equipment) B( K; n t+ s, X' G( x
devices are accepted as in 1 and 2 above.: ~* Y5 D; {, N8 G. i7 R: t. I% Y+ b
Note: Components shall be physically mounted in such a way that no hazard can arise in the
5 _: F: @* o& i& d' j# k' P. t sevent of the device failing catastrophically.; ?6 {0 T. h! M) X
Explanation:
0 K5 z& T1 H+ X- ^1 K. Z; r8 TVaristors are semi-conductor devices and therefore, cannot be treated as high integrity
' ~" o# X) N+ m1 C3 G% x7 c. {devices and must therefore, always have additional protection.( D2 L; ?+ q4 a6 Q6 P% s/ ~
Varistors in the equipment or installation coupled with safe construction and approvals meet9 C: \9 J4 W- J9 u" T7 w7 X
these requirements except where the disconnection of earth is possible as a single fault. In% [; U! Q5 }( V
this case, the slow deterioration of the device with time, allowing an increase in earth
$ D* M& Q4 n0 k4 i' W. vleakage current, is not acceptable and the devices are, therefore, not allowed.: s" H) g0 U4 S
U, l( e5 s% O* I' K$ Q) J7 K- T8 p
+ z$ W; n7 V2 H" ~2 Z# }
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发表于 2012-9-19 14:47
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