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发表于 2008-11-2 14:42
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DESCRIPTION OF ISSUE:
! w1 m( {: m7 d8 G: u D. W DType of Issue: Technical/Certification
1 N) }3 [6 I" K8 X' w- ?What insulation level may the casing of X1, X2, X3, Y1, Y2, and Y3 capacitors under IEC9 e$ l* j3 D: I- x8 w2 M- t0 x
60384-14, and X1, Y1 and Y2 capacitors under UL 1414 (FOWX2), and capacitors under UL
$ C1 V; [' ^' R, A4 h5 L- k5 m; v1283 (FOKY2) be relied upon to act as?0 v5 m! _) N6 g! M1 v( D9 V
APPLICATION GUIDELINE:2 W: L& V- L3 \/ W+ F: ]2 i- F
Capacitor casings of Certified X1, X2, X3, Y1, Y2 or Y3 capacitors to IEC 60384-14 may be; q) h, {- e. e; g/ }
accepted as Operational or Basic insulation when the capacitors are used in circuits compatible" P& Y. T- E, e4 F9 e. `9 o4 v
with their ratings. Therefore, these capacitors do not need to be provided with an additional,
$ x4 M M' d& Y: [definable insulation level when the capacitor casing is acting as Basic or Operational insulation.6 @* ]. U: G9 J5 D+ Q8 @; W/ Q
(Y1 capacitors may be accepted as Reinforced insulation also.); n% D/ X/ F3 g1 `
Capacitor casings of X1, Y1, and Y2 capacitors Recognized to UL 1414 under Across-The-Line
. ^: L. P; x" N6 JCapacitors, Antenna Coupling and Line-By-Pass Components (FOWX2) may also be accepted; @/ t7 O" G, O& P3 [* T! q1 y
as Operational or Basic insulation when the capacitors are used in circuits compatible with their
- U/ r0 K0 a, v% gratings. Therefore, these components do not need to be provided with an additional, definable insulation level, such as Recognized Component – Tubing, when adequate clearances are not4 T& l4 ~- Y2 A( \
provided between the capacitor casing and another component or an earthed dead metal part.' Q, E; E/ J4 x* k
(Y1 capacitors may be accepted as Reinforced insulation also.)
' L- i1 V9 q( gCapacitor casings of capacitors Recognized to UL 1283 under Electromagnetic Interference4 u4 X5 M* w {( g1 z% g" D% d
Filters (FOKY2) also may be accepted as Operational or Basic Insulation when the capacitors b4 C" E- g! G: q& s3 p
are used in circuits compatible with their ratings. Therefore, these components do not need to) T9 q1 A2 m1 z% G0 I+ G3 i. ^, h* z- ^
be provided with an additional, definable insulation level when the capacitor casing is acting as, E0 C% p" p3 Y+ |; c) D; G6 y2 O
basic or operational insulation.5 l7 Z. k0 a' @1 f; g
RATIONALE:( v \- ~& G) x! V1 d3 h) z" B
Under IEC 60384-14, X1, X2, X3, Y2, and Y3 capacitors are subjected to a minimum Electric
4 K& o, N* S% ]Strength Test of 2000 V rms between live parts and case. Y1 capacitors are subjected to a 4000! x0 k* C& f0 f7 e0 d
V test. (Y4 are only subjected to a 900 V test).
# s8 S3 u7 A0 ~2 |9 w8 H( ~9 [For Recognized Component FOWX2 capacitors, UL 1414 now covers X1, Y1 and Y2 capacitors,
" y* V, L% P: \and the minimum Electric Strength Test is 2000 V between live parts and case. Y1 capacitors
. w' U6 j; \* E1 r1 j" q# Rare subjected to a 4000 V test.
. L3 _# e3 u4 B. M. nFor Recognized Component FOKY2 capacitors, UL 1283 requires the insulation between live* w% }$ T) w' ?
parts and casing is required to pass a 2Vr+1500V (Vrating =< 250V) electric strength test.
, F; n" i5 O% `) A Q) c0 f) HAdditionally, the case is required to be V-2 or less flammable (or equivalent), and meet UL 746C
' S) v/ X. Q: t6 |( o' ?" `8 l+ m4 H(or generic) insulation requirements.
# w0 n) V8 P4 NOTHER:
/ B9 A+ u+ X! l4 kComments:
1 p; Q& v+ t9 \! D7 gInterpretation Systems:
$ A+ h# o$ q0 }5 x7 A/ \- }/ [• IEC TC 108 Interpretation Sheets: Q243 T$ c, R/ N4 v) ?3 [
• CENELEC OSM/EE Decisions: 1.5.7.1 (95/9, 97/1), 2.10 (95/8)
0 t& j8 @/ y2 p) ]( \RELATED APPLICATION GUIDELINE(S): 1.5.6-2 |
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