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发表于 2008-11-2 14:42
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DESCRIPTION OF ISSUE:
5 @3 a* E! y! j& G# {; {, qType of Issue: Technical/Certification
" y* b! Q8 V9 {5 r1 j5 SWhat insulation level may the casing of X1, X2, X3, Y1, Y2, and Y3 capacitors under IEC5 I# ^7 b0 V @" F2 d6 o
60384-14, and X1, Y1 and Y2 capacitors under UL 1414 (FOWX2), and capacitors under UL- \1 P1 y4 `7 ?3 i5 j7 J
1283 (FOKY2) be relied upon to act as?
4 h- ?- Y4 T# r/ p, x" gAPPLICATION GUIDELINE:1 h+ s1 G( F& i6 ^
Capacitor casings of Certified X1, X2, X3, Y1, Y2 or Y3 capacitors to IEC 60384-14 may be
p' @% i! V) t+ Vaccepted as Operational or Basic insulation when the capacitors are used in circuits compatible
: C# p: W9 P: c1 Y# O3 nwith their ratings. Therefore, these capacitors do not need to be provided with an additional,1 Y; K2 O! @. Y9 G3 Q4 M! }
definable insulation level when the capacitor casing is acting as Basic or Operational insulation.
& i; r+ F% R$ p- O' a(Y1 capacitors may be accepted as Reinforced insulation also.); I: \7 b4 m- ~0 F2 ^/ S' r" _3 t$ b
Capacitor casings of X1, Y1, and Y2 capacitors Recognized to UL 1414 under Across-The-Line7 Z1 L/ E/ z( _5 [, Q
Capacitors, Antenna Coupling and Line-By-Pass Components (FOWX2) may also be accepted
. L- q& ^ p# b9 k* nas Operational or Basic insulation when the capacitors are used in circuits compatible with their+ _- j# r1 U: ]/ _
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' [% r: H' X! g3 w) L
provided between the capacitor casing and another component or an earthed dead metal part.
" e8 ^+ I% a3 p& K6 [5 E% J(Y1 capacitors may be accepted as Reinforced insulation also.)
: Q0 b( p6 l+ f% i( eCapacitor casings of capacitors Recognized to UL 1283 under Electromagnetic Interference
4 I4 X4 x: J" @ RFilters (FOKY2) also may be accepted as Operational or Basic Insulation when the capacitors# u) _$ v- l" H/ y
are used in circuits compatible with their ratings. Therefore, these components do not need to" W8 T, n3 U0 [/ T7 h: ]8 T$ ?
be provided with an additional, definable insulation level when the capacitor casing is acting as
# C: I% k* n' C9 Pbasic or operational insulation.2 r. |: z$ d0 l& g# I
RATIONALE:- P$ c& r0 l) b9 P- m' |
Under IEC 60384-14, X1, X2, X3, Y2, and Y3 capacitors are subjected to a minimum Electric
0 A' L3 s1 C8 ]6 {0 {& RStrength Test of 2000 V rms between live parts and case. Y1 capacitors are subjected to a 4000
4 `2 ~! N9 H! pV test. (Y4 are only subjected to a 900 V test).; m" Q! O1 L2 ?( g' `# n3 ?/ E9 _
For Recognized Component FOWX2 capacitors, UL 1414 now covers X1, Y1 and Y2 capacitors,, X4 N h/ ^5 h" H/ `
and the minimum Electric Strength Test is 2000 V between live parts and case. Y1 capacitors
' f$ g0 u. o3 f8 [- H9 I7 r& Rare subjected to a 4000 V test.- n/ _) W5 t7 o; k$ `
For Recognized Component FOKY2 capacitors, UL 1283 requires the insulation between live6 N7 j L: a. h9 Z0 H: u
parts and casing is required to pass a 2Vr+1500V (Vrating =< 250V) electric strength test.
1 f0 q; Y: A: L% L# K1 a- Y. J0 FAdditionally, the case is required to be V-2 or less flammable (or equivalent), and meet UL 746C
# p( s& z- p$ h: g) {( y(or generic) insulation requirements.
. r, A4 K2 A5 @. Z, Z% _OTHER:! ~1 b( M% ^2 [* C) _9 G
Comments:
6 x% {$ `( F1 \/ h' q+ U& n6 |Interpretation Systems:. d# k+ i. B+ ]& X' t% `/ i
• IEC TC 108 Interpretation Sheets: Q241 v) j' T! g& ^' S% ]/ S$ J. S0 A
• CENELEC OSM/EE Decisions: 1.5.7.1 (95/9, 97/1), 2.10 (95/8)) z3 X8 y( g! S; `2 g3 P
RELATED APPLICATION GUIDELINE(S): 1.5.6-2 |
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