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发表于 2008-11-2 14:42
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DESCRIPTION OF ISSUE:; i3 A( s: i3 P- m& f% Y5 v) r
Type of Issue: Technical/Certification
; n( [& S2 R2 CWhat insulation level may the casing of X1, X2, X3, Y1, Y2, and Y3 capacitors under IEC
- \0 w8 v- U5 ]7 n60384-14, and X1, Y1 and Y2 capacitors under UL 1414 (FOWX2), and capacitors under UL7 q1 H) X5 |3 p0 b, E$ Z* j
1283 (FOKY2) be relied upon to act as?
& V' ^* R" W& l d* BAPPLICATION GUIDELINE:% a$ c5 h$ Z0 p: \
Capacitor casings of Certified X1, X2, X3, Y1, Y2 or Y3 capacitors to IEC 60384-14 may be. e) A* a& }* f# \" a
accepted as Operational or Basic insulation when the capacitors are used in circuits compatible# V' n* p5 r; F6 C9 M. e( `2 y- v$ i2 Y$ V
with their ratings. Therefore, these capacitors do not need to be provided with an additional,
# F {/ I# B/ U7 d8 n+ l7 X, A' {definable insulation level when the capacitor casing is acting as Basic or Operational insulation.% Z8 K- P# `5 p5 z" [3 k. O
(Y1 capacitors may be accepted as Reinforced insulation also.)
% i. D* F1 K( p# u* r9 u' vCapacitor casings of X1, Y1, and Y2 capacitors Recognized to UL 1414 under Across-The-Line
4 w) a2 t9 R) H1 d* n2 s9 `+ @Capacitors, Antenna Coupling and Line-By-Pass Components (FOWX2) may also be accepted
! [& f/ r- y' Z, q( K* K* aas Operational or Basic insulation when the capacitors are used in circuits compatible with their* z# f' R. ]2 W3 z1 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
; `/ j9 N3 W/ C" Tprovided between the capacitor casing and another component or an earthed dead metal part.' ^3 d. X `& @% T- T# q! u
(Y1 capacitors may be accepted as Reinforced insulation also.)
9 Z8 C7 ~! a! _/ e z7 F5 S$ kCapacitor casings of capacitors Recognized to UL 1283 under Electromagnetic Interference
4 B. f; \$ \9 a9 D( [Filters (FOKY2) also may be accepted as Operational or Basic Insulation when the capacitors' P" s$ @, ?/ }0 D: R2 y/ Y
are used in circuits compatible with their ratings. Therefore, these components do not need to- F+ T& ?7 j' n: s, \+ H
be provided with an additional, definable insulation level when the capacitor casing is acting as
* L* P* b# e( m7 k% `/ B# K8 ]basic or operational insulation.+ x* I4 p' O8 ^
RATIONALE:
/ d1 x- s$ ^9 c& U$ ?- t$ H# ]1 HUnder IEC 60384-14, X1, X2, X3, Y2, and Y3 capacitors are subjected to a minimum Electric
% A" l# Y8 f8 H% Z8 OStrength Test of 2000 V rms between live parts and case. Y1 capacitors are subjected to a 4000
$ l8 ^" C% N z+ y% v+ ]. }V test. (Y4 are only subjected to a 900 V test).( X4 g% R3 b7 r: c9 }4 @; d. x
For Recognized Component FOWX2 capacitors, UL 1414 now covers X1, Y1 and Y2 capacitors,
+ M" S4 l9 p9 P/ s& w, Vand the minimum Electric Strength Test is 2000 V between live parts and case. Y1 capacitors0 r+ \# J L% ]! N3 V: n
are subjected to a 4000 V test.
8 F* j9 Q5 }! y# }For Recognized Component FOKY2 capacitors, UL 1283 requires the insulation between live6 Z+ c. R( F8 b
parts and casing is required to pass a 2Vr+1500V (Vrating =< 250V) electric strength test.
! X. W! W: g5 ` m( |- e6 r/ OAdditionally, the case is required to be V-2 or less flammable (or equivalent), and meet UL 746C( K. }" g2 q: i; a
(or generic) insulation requirements.
+ w) R, J b/ d$ `) T' i) {* pOTHER:
* k6 n6 G7 C" h& Y7 sComments:
' ?, M k. A: `Interpretation Systems:$ N& Q' d5 w. ?! Y6 t4 X
• IEC TC 108 Interpretation Sheets: Q24
j8 e+ ]+ H/ i2 ^, w% k4 n• CENELEC OSM/EE Decisions: 1.5.7.1 (95/9, 97/1), 2.10 (95/8)
5 }2 c/ ~! S8 V" `- G+ U) FRELATED APPLICATION GUIDELINE(S): 1.5.6-2 |
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