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发表于 2008-11-2 14:42
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DESCRIPTION OF ISSUE:* G4 ?. o4 Y- ]0 ?
Type of Issue: Technical/Certification" `+ ~- U7 X% b+ {0 _. H: e
What insulation level may the casing of X1, X2, X3, Y1, Y2, and Y3 capacitors under IEC$ q# b; l4 J+ f; D+ W
60384-14, and X1, Y1 and Y2 capacitors under UL 1414 (FOWX2), and capacitors under UL
" Q U) G4 ] o0 u+ N0 W1283 (FOKY2) be relied upon to act as?
. m9 d; L- S! t6 xAPPLICATION GUIDELINE:
. Y; S' b. I+ B3 Y; N, N+ ^( @Capacitor casings of Certified X1, X2, X3, Y1, Y2 or Y3 capacitors to IEC 60384-14 may be
3 Q& }0 ?0 K& P2 |accepted as Operational or Basic insulation when the capacitors are used in circuits compatible
! G( J- Y* s" H4 v6 o8 dwith their ratings. Therefore, these capacitors do not need to be provided with an additional,) A8 U5 b0 H: h! Y% B# y) I
definable insulation level when the capacitor casing is acting as Basic or Operational insulation., M; z% @1 R T) e$ ~% H
(Y1 capacitors may be accepted as Reinforced insulation also.)
W& h- o1 Z& I8 m6 a1 ?Capacitor casings of X1, Y1, and Y2 capacitors Recognized to UL 1414 under Across-The-Line2 [$ V& o. v/ c5 S2 p- _2 a
Capacitors, Antenna Coupling and Line-By-Pass Components (FOWX2) may also be accepted1 P E5 Z5 ?# {
as Operational or Basic insulation when the capacitors are used in circuits compatible with their* f7 X- d3 c6 L4 e3 a2 e1 @9 A. l% z6 J. `
ratings. Therefore, these components do not need to be provided with an additional, definable insulation level, such as Recognized Component – Tubing, when adequate clearances are not% M# ^( o( n6 P
provided between the capacitor casing and another component or an earthed dead metal part." S" e9 Q& H1 y; l( l d
(Y1 capacitors may be accepted as Reinforced insulation also.)7 ^4 E% u2 L& z0 `
Capacitor casings of capacitors Recognized to UL 1283 under Electromagnetic Interference
$ U4 Q" c$ s" q' i* ]3 fFilters (FOKY2) also may be accepted as Operational or Basic Insulation when the capacitors
3 n' C7 _3 } q, uare used in circuits compatible with their ratings. Therefore, these components do not need to% l9 i7 k, g- ~, r/ i* Z
be provided with an additional, definable insulation level when the capacitor casing is acting as
. S( L3 ?9 O9 B4 v9 D, xbasic or operational insulation., \4 n0 q/ |3 J( N3 W) W0 Q% _& r
RATIONALE:! o3 W& a/ ]% V! y; R
Under IEC 60384-14, X1, X2, X3, Y2, and Y3 capacitors are subjected to a minimum Electric( E3 B" R& B+ @' Q' W
Strength Test of 2000 V rms between live parts and case. Y1 capacitors are subjected to a 40008 D! S% I+ }0 K
V test. (Y4 are only subjected to a 900 V test).! `* M9 {- e2 {
For Recognized Component FOWX2 capacitors, UL 1414 now covers X1, Y1 and Y2 capacitors, c3 B$ ?& h1 J [+ [6 j- h
and the minimum Electric Strength Test is 2000 V between live parts and case. Y1 capacitors
; `& f, n ^" ^( e5 }are subjected to a 4000 V test.& y$ y8 N$ w. Y+ E8 B
For Recognized Component FOKY2 capacitors, UL 1283 requires the insulation between live- M% G! \2 m6 N
parts and casing is required to pass a 2Vr+1500V (Vrating =< 250V) electric strength test.
; P" }# V6 G r8 l% u ]Additionally, the case is required to be V-2 or less flammable (or equivalent), and meet UL 746C! B2 i+ w7 F2 f0 T
(or generic) insulation requirements.
- [9 G/ g1 Z9 j% S/ Z aOTHER:
3 a1 Q$ i, R1 v8 ]Comments:
* Q" ~6 o1 m/ o5 P7 o% v, U4 SInterpretation Systems:
# R* l1 H4 O! z$ p4 y6 p/ m/ @! k• IEC TC 108 Interpretation Sheets: Q24% ]2 d; n% L5 E: `' E
• CENELEC OSM/EE Decisions: 1.5.7.1 (95/9, 97/1), 2.10 (95/8)) } _1 f) ^6 O8 ^# O2 F2 @
RELATED APPLICATION GUIDELINE(S): 1.5.6-2 |
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