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! A2 i7 ]; j* N( s4 m! ?% P, X( @' U; Y8 l% I& X+ ~/ C% i# R; O
 DSH 311
( C( a' B* o1 z( m5 O# _5 e1 t | Components
3 H2 X( Q$ k8 C1 p9 o( N | 14
0 n8 P7 F* l% k% X | 61010-1(ed.1);am1;am2
0 N$ ^# I! f( |0 J* K; a. R- x |
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7 z5 f1 z* d- o, T/ H
Standard:
# U3 X. N5 \- `IEC 61010-
. q) t7 p# V' U# q) W1:1990+A1:1992+A2:1995
" C) f$ \ i' l# ~; r. H$ lSub clause:; v/ \5 s: ]; [9 K* D# J
14
6 |8 m- s0 ]0 Y* |2 W& D' ?Sheet n. 311 ?/ u3 ^! K5 T1 N/ P
Page 1(1)
) g7 c$ a" {' j* TSubject:
$ a$ A4 ]* U) C5 eComponents
+ L+ Q6 E/ z) D7 s3 u; R9 ]Key words:( M! H' h- u. \9 S" n4 [
- Installation
$ M5 r1 C5 T, y" R- Y- Category2 ^) |8 C. s5 Y. l) B! b
Decision taken by9 h# ` A5 t4 ?
ETF3 and confirmed
V2 f9 L( x5 A2 Eby CTL at its 38th
3 A. [1 S/ \. d% U# cmeeting, in Toronto. }) ~/ B& T; _5 R0 X
Question:
. }# V0 I U. S0 G8 u1 y8 H+ q! ZWhere equipment is fitted with surge protection devices, is it acceptable for the circuits
" z% x6 M2 w" c8 G4 m4 Ffollowing the device to be a lower category than those preceding it?
* U0 Q4 g3 a; f6 D: J. l, P6 b: KDecision:
9 ]. s' M% a, [- E1 _It is acceptable, for example, for a Category III equipment to have circuits at Category II g9 G2 J$ \, c6 ?- w
following such a device.
) u- @# K# }! K' K+ o& ~Explanation:$ Z" I. l3 I7 W
The action of these devices is to remove excessive voltage spikes from the circuit and
- ?$ q7 n+ l1 x" g2 F1 P4 h2 ]0 utherefore, the Category of the circuit may be reduced accordingly. IEC 664 does have more7 c, g8 Q( _) x- B! [
tests to allow this. 5 sec. “spike” will destroy surge protection
+ i# p5 Y/ K' f4 W0 D' I+ b) B, f" x/ d2 _/ H# C' d
5 `4 r" @' x K( N2 t9 E7 Q2 Z
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发表于 2012-9-19 14:45
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