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6 Y& H: W, |7 v
 DSH 310; c9 T: u6 Z* }- V& w: Z: v6 ^
| Components m$ Z S" `/ K# o
| 14' N6 Z7 f4 d( @( V
| 61010-1(ed.1);am1;am2
- O, D* \8 G, s6 t6 z l |
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Standard:
% s- q- |* n' H) ~, r4 l. J& AIEC 61010-
1 c2 P8 e# F. E6 ]" R" ?2 q1:1990+A1:1992+A2:1995
9 ?& _0 K! |- \% L) E" s: HSub clause:
/ k' e. C$ ]7 M/ S# L14. R7 o$ u: l* j: l
Sheet n. 310" Y, q' w. i" Q
Page 1(1)$ ?- L' |* p+ e! g, [) k
Subject:3 F; z, ~) b& ^
Components: E: m) R0 b$ K% z ]
Key words:5 X7 v Y6 h; F
- Transient
# T, s0 L! ]$ s% m: j& T! y* U/ N) } f- Suppressor$ O+ w. ?8 |. e
- Mains
$ W' C& g1 t" t. N8 FDecision taken by
! _& s9 R% a0 i, B1 d) qETF3 and confirmed
+ c5 \' D/ H& P' G* d( vby CTL at its 38th
0 D4 t" S) z: }( K' L; O) Cmeeting, in Toronto
; u0 [- B/ F7 A! A$ {6 nQuestion:1 h+ O: x( Q! } e: U: H( I
Is the use of transient suppressor devices such as varistors accepted in equipment and, if so,+ }) ~8 {1 x" z7 G* l. u8 H
under what conditions+ F' P$ X; {# y1 \0 G8 H
Decision:0 v+ m, c2 M' r3 X* ~4 \8 \# d
Varistors are accepted in the following conditions:
; i5 }6 j% h+ b8 Q1 Between Live and neutral conductors after the mains fuse.
i! t3 K g8 `7 j t2 c# \$ ^No component approval demanded.7 H( a+ j- W/ y& K( j0 w8 p
2 Between Live and neutral conductors, before the mains fuse.
. ~' d/ U+ L) ?4 fOnly accepted if the component is approved to an international standard (IEC 61051 or
) t3 o6 w- j3 `9 \# @2 B- \1 ICECC 42200)5 E2 N. s$ n5 M5 M$ X4 K7 V
3 Between Live and Earth conductors (before or after the mains fuse)
$ x$ l5 K4 z$ r Q4 Ga) pluggable equipment1 a5 h s) ^; U/ @# r
devices are not accepted
+ `& v' G8 j# o& v2 a, Eb) permanently installed equipment8 c( T. m& S0 p, w6 ]0 [3 W8 Y/ t
devices are accepted as in 1 and 2 above.2 c/ C, _% ?: b8 Y4 w: I
Note: Components shall be physically mounted in such a way that no hazard can arise in the
+ F7 L4 A8 o+ z, eevent of the device failing catastrophically.
7 _1 r# r& ^2 A. s G$ ]Explanation:3 b6 v! p4 r$ `, h
Varistors are semi-conductor devices and therefore, cannot be treated as high integrity
5 G) x4 \, {1 F6 C2 b: W0 m8 {devices and must therefore, always have additional protection.8 P E! l7 v& r% `
Varistors in the equipment or installation coupled with safe construction and approvals meet/ L4 W- |4 @# B: t5 O' h
these requirements except where the disconnection of earth is possible as a single fault. In
5 N- L' T, ?7 e6 r1 bthis case, the slow deterioration of the device with time, allowing an increase in earth
2 B2 Z% E2 J+ T. V9 v( A: xleakage current, is not acceptable and the devices are, therefore, not allowed.; u* I2 o! Q+ m4 u
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发表于 2012-9-19 14:47
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