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5 G f% |$ a. b! o$ w. I! h
 DSH 311" |; Y/ |. W: C7 C4 q& k5 p4 r
| Components M4 P% e8 k6 l
| 14: A' c2 O0 p k$ [; S V
| 61010-1(ed.1);am1;am25 j: s# Q' Z; O8 ~" w1 O
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6 Z: }7 Z% g8 ^* }# L! iStandard:( y' p3 c4 [) Y/ R
IEC 61010-1 B7 P1 j6 r" V, J2 i
1:1990+A1:1992+A2:1995. ?" \, F) y; a2 {8 |* R" [8 e3 G
Sub clause:+ u# _2 K+ w( f+ c
145 X( C+ \0 y o* c
Sheet n. 311
]) E: l# a* U, K8 _$ `4 {, h5 NPage 1(1): b% d5 J6 R$ j
Subject:
; i8 l3 l) U. _: e" p* Q6 UComponents- c" o; }) ]' O7 j# {+ N# j4 n3 K
Key words:
. ^, X% |) @. ^, s5 }- Installation% F% S& Z U) O
- Category) A/ ?" W; Y( o3 T# n# n/ K
Decision taken by' i# J g# s2 F4 z4 ]" q: @2 K3 p
ETF3 and confirmed3 [, Q- K7 k% Z) a$ r. w' F
by CTL at its 38th
4 [5 t; ?" _/ a0 D& y: J' D3 ]! z- ?meeting, in Toronto5 J" h" C2 L0 z% w. t7 X6 L# m
Question:3 \: `1 J! R4 ?
Where equipment is fitted with surge protection devices, is it acceptable for the circuits/ k, u+ K. }1 N" x
following the device to be a lower category than those preceding it?( i* A+ y1 s% H! Z: _6 j ?* F
Decision:% ^. `! t2 {6 m N- M9 F" ^$ C+ s9 @
It is acceptable, for example, for a Category III equipment to have circuits at Category II4 d4 M$ F3 z0 A8 B
following such a device.
: m/ {) r3 Q x. g# a, w, w3 c2 Z1 }Explanation:
9 H2 H; y6 }& ]3 M/ f0 l4 uThe action of these devices is to remove excessive voltage spikes from the circuit and
' Q8 p+ u. p1 j0 J: n9 \+ `therefore, the Category of the circuit may be reduced accordingly. IEC 664 does have more" b4 z+ A4 j& w7 X: d& K y. Q
tests to allow this. 5 sec. “spike” will destroy surge protection
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发表于 2012-9-19 14:45
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