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发表于 2008-11-2 14:42
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DESCRIPTION OF ISSUE:3 d5 t& i3 k5 }: |
Type of Issue: Technical/Certification
6 T' U& m7 N8 A1 EWhat insulation level may the casing of X1, X2, X3, Y1, Y2, and Y3 capacitors under IEC
' B2 _, K! {0 M3 r8 ]# {1 T60384-14, and X1, Y1 and Y2 capacitors under UL 1414 (FOWX2), and capacitors under UL
7 O% c$ X$ I3 M0 h, |6 w# S1283 (FOKY2) be relied upon to act as?
5 ?& E7 Q& k: p9 kAPPLICATION GUIDELINE:; N+ w# F5 q" i) x* U* `5 c4 p) S
Capacitor casings of Certified X1, X2, X3, Y1, Y2 or Y3 capacitors to IEC 60384-14 may be
4 z) _$ J. K* n+ V3 @accepted as Operational or Basic insulation when the capacitors are used in circuits compatible
9 x% `, N* O. H: y+ ~with their ratings. Therefore, these capacitors do not need to be provided with an additional,) v' `( {4 I9 a9 i
definable insulation level when the capacitor casing is acting as Basic or Operational insulation.
) k3 E" [. D e7 t+ A/ N(Y1 capacitors may be accepted as Reinforced insulation also.)& M+ o4 v" }: U7 ~4 T: x: S1 r
Capacitor casings of X1, Y1, and Y2 capacitors Recognized to UL 1414 under Across-The-Line. m, R( u; x8 q6 v' U6 \
Capacitors, Antenna Coupling and Line-By-Pass Components (FOWX2) may also be accepted, q9 U$ ~, h7 ~; [( h" J! z# y
as Operational or Basic insulation when the capacitors are used in circuits compatible with their
. X0 ^& U+ F0 ?, e4 oratings. 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
2 c# z5 R E# d+ Z! h: |provided between the capacitor casing and another component or an earthed dead metal part.
% H+ Q' \) T/ J! w(Y1 capacitors may be accepted as Reinforced insulation also.)6 a } b5 Q, m* {
Capacitor casings of capacitors Recognized to UL 1283 under Electromagnetic Interference
. ?9 w0 s& p' n9 T! e' [1 yFilters (FOKY2) also may be accepted as Operational or Basic Insulation when the capacitors- Q& w3 M! i/ j* X" E o0 e. y- O1 U
are used in circuits compatible with their ratings. Therefore, these components do not need to: Q0 Y5 s4 u6 h9 \: T& i
be provided with an additional, definable insulation level when the capacitor casing is acting as( o/ _; b! |9 _/ D
basic or operational insulation.
2 s& } z# J4 y, m: K$ gRATIONALE:
" \0 u' A0 n# M1 d# zUnder IEC 60384-14, X1, X2, X3, Y2, and Y3 capacitors are subjected to a minimum Electric L1 V* o& S2 q6 O) e! i" q0 c2 p
Strength Test of 2000 V rms between live parts and case. Y1 capacitors are subjected to a 40003 k, T5 x; H- v6 N6 N9 ^
V test. (Y4 are only subjected to a 900 V test).
) T! ~+ }3 s) o5 J$ U& R2 O' {For Recognized Component FOWX2 capacitors, UL 1414 now covers X1, Y1 and Y2 capacitors,, J4 ~# J0 `. j) ?, o- B* R
and the minimum Electric Strength Test is 2000 V between live parts and case. Y1 capacitors
, W/ f- k8 B. K$ t' [0 Qare subjected to a 4000 V test.' L# V1 n4 v6 K! R
For Recognized Component FOKY2 capacitors, UL 1283 requires the insulation between live
2 y* a' f4 T( {+ d3 Q- I( s9 tparts and casing is required to pass a 2Vr+1500V (Vrating =< 250V) electric strength test./ U# i1 [' i t
Additionally, the case is required to be V-2 or less flammable (or equivalent), and meet UL 746C+ w3 m: E2 r1 Y7 X7 l4 ]) N
(or generic) insulation requirements.% V; l( M. X9 `6 z3 j: u( T
OTHER:+ S- L+ \% X; t$ S5 T
Comments:3 G; Y' {' j' L" {$ E- y' f( W
Interpretation Systems:
! }: V& y. ~2 M% U3 P9 J/ [7 J• IEC TC 108 Interpretation Sheets: Q24
3 R1 R/ X) w4 ?; Z4 v• CENELEC OSM/EE Decisions: 1.5.7.1 (95/9, 97/1), 2.10 (95/8)/ g* w; c* E1 h. |
RELATED APPLICATION GUIDELINE(S): 1.5.6-2 |
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