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发表于 2008-11-2 14:42
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DESCRIPTION OF ISSUE:6 T) V7 f; _ o$ r0 j. o/ V. h, d
Type of Issue: Technical/Certification
7 j S2 w+ b8 h( [ h/ dWhat insulation level may the casing of X1, X2, X3, Y1, Y2, and Y3 capacitors under IEC! z ?4 K0 \# o q1 P* R7 h2 c
60384-14, and X1, Y1 and Y2 capacitors under UL 1414 (FOWX2), and capacitors under UL
0 o8 W! }0 M# Y" [ B4 I1283 (FOKY2) be relied upon to act as?
$ `" j2 w- }6 B% T: U* y2 q6 q& ?4 CAPPLICATION GUIDELINE:! r4 q+ X, T7 R* {7 f6 r9 M3 I6 B
Capacitor casings of Certified X1, X2, X3, Y1, Y2 or Y3 capacitors to IEC 60384-14 may be
# _9 T7 ~ Q9 L4 Xaccepted as Operational or Basic insulation when the capacitors are used in circuits compatible# G+ y, r9 `. L' Q$ T% p& A+ o4 w. Y
with their ratings. Therefore, these capacitors do not need to be provided with an additional,
% j! Z& f2 M. _. z& S4 udefinable insulation level when the capacitor casing is acting as Basic or Operational insulation.
5 [7 r) z4 j7 q* S+ e8 ` Y; B$ q(Y1 capacitors may be accepted as Reinforced insulation also.)0 Z! B/ E/ s4 [6 b. ]
Capacitor casings of X1, Y1, and Y2 capacitors Recognized to UL 1414 under Across-The-Line
- x1 L% t/ B' m% }9 O6 E: zCapacitors, Antenna Coupling and Line-By-Pass Components (FOWX2) may also be accepted
3 ?* b6 g+ s% [- V; Y6 L8 tas Operational or Basic insulation when the capacitors are used in circuits compatible with their& V6 @- u+ U7 W* S! F
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
& T4 V) q( y. Z& |2 l8 J3 {provided between the capacitor casing and another component or an earthed dead metal part.: J8 R6 `( x3 a4 ]0 L8 F1 r
(Y1 capacitors may be accepted as Reinforced insulation also.)
! s8 T& B* R6 @* I* E, K. ECapacitor casings of capacitors Recognized to UL 1283 under Electromagnetic Interference
( }" e' d7 i* |Filters (FOKY2) also may be accepted as Operational or Basic Insulation when the capacitors) I; Y* B( }( I9 ~# K5 ?% Z7 G
are used in circuits compatible with their ratings. Therefore, these components do not need to' v* n8 R! z3 P$ X) j" O2 v8 s
be provided with an additional, definable insulation level when the capacitor casing is acting as
' k) Y% @9 q- \$ @4 O2 ~) Rbasic or operational insulation.
8 n& ?& H. y* y+ T$ @3 ?8 @RATIONALE:8 }8 ] V4 m3 ]) _8 B" @
Under IEC 60384-14, X1, X2, X3, Y2, and Y3 capacitors are subjected to a minimum Electric
/ H0 L' q* n/ M L1 B) Y5 P" w. F; tStrength Test of 2000 V rms between live parts and case. Y1 capacitors are subjected to a 4000
8 {) ^7 w/ h# m4 rV test. (Y4 are only subjected to a 900 V test).: v7 W# u5 s$ `/ |/ r
For Recognized Component FOWX2 capacitors, UL 1414 now covers X1, Y1 and Y2 capacitors,
3 F0 h- h' G6 K8 e- ]and the minimum Electric Strength Test is 2000 V between live parts and case. Y1 capacitors
$ v: U: f, `9 @- lare subjected to a 4000 V test.
8 L/ A/ x# E& [+ E+ v! y M* H2 [For Recognized Component FOKY2 capacitors, UL 1283 requires the insulation between live E+ o8 S. ~$ m: g3 R4 a% Q
parts and casing is required to pass a 2Vr+1500V (Vrating =< 250V) electric strength test.
E% h0 Q+ f' s5 A2 }9 t/ v9 u+ ]Additionally, the case is required to be V-2 or less flammable (or equivalent), and meet UL 746C& V+ H- y4 `; p" [5 b
(or generic) insulation requirements.+ m9 n. U/ |8 Q' n G+ g) e* T! t
OTHER:7 U4 Q( w% y. e) v4 m5 q
Comments:$ K5 B. e; X" [/ O' l+ x& v
Interpretation Systems:* @7 k- m. u+ d) o4 D) u, K
• IEC TC 108 Interpretation Sheets: Q24) z2 W: e9 p6 h/ z5 A
• CENELEC OSM/EE Decisions: 1.5.7.1 (95/9, 97/1), 2.10 (95/8)/ l# e7 p4 c7 y0 a
RELATED APPLICATION GUIDELINE(S): 1.5.6-2 |
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