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发表于 2008-11-2 14:42
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DESCRIPTION OF ISSUE:* t" v7 W. d# c5 B$ B
Type of Issue: Technical/Certification
- H* m+ h; u$ l$ J+ s8 z2 zWhat insulation level may the casing of X1, X2, X3, Y1, Y2, and Y3 capacitors under IEC& `0 n) j. h8 F
60384-14, and X1, Y1 and Y2 capacitors under UL 1414 (FOWX2), and capacitors under UL
+ R# B! X z3 w+ m8 G: e1283 (FOKY2) be relied upon to act as?
' |6 l0 V/ @ O% b# k! |9 _/ t' b0 mAPPLICATION GUIDELINE:( ]7 @/ K( t: |+ h5 H, R8 E! A ?
Capacitor casings of Certified X1, X2, X3, Y1, Y2 or Y3 capacitors to IEC 60384-14 may be# A$ ]3 G" A. z% l/ i) [/ y
accepted as Operational or Basic insulation when the capacitors are used in circuits compatible- K+ V! b2 ?) z# I. Q6 F h6 ]6 v! [
with their ratings. Therefore, these capacitors do not need to be provided with an additional,& A. c; Z4 D( p4 @
definable insulation level when the capacitor casing is acting as Basic or Operational insulation.. ]; D) g7 t" I7 l: x! M% w
(Y1 capacitors may be accepted as Reinforced insulation also.)5 m W d, B/ [8 T+ _
Capacitor casings of X1, Y1, and Y2 capacitors Recognized to UL 1414 under Across-The-Line. ?2 P6 {9 ^& E! z" e' [
Capacitors, Antenna Coupling and Line-By-Pass Components (FOWX2) may also be accepted' i2 N( w) v j' g, ?( q
as Operational or Basic insulation when the capacitors are used in circuits compatible with their
* @" x/ Y" C/ D; Q+ L6 T1 @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
6 W( e2 W4 v: A; E/ Dprovided between the capacitor casing and another component or an earthed dead metal part.
3 m* J5 o2 h6 D( h5 q4 y6 I2 x(Y1 capacitors may be accepted as Reinforced insulation also.)
( @; N+ B/ L" O; w% r! \Capacitor casings of capacitors Recognized to UL 1283 under Electromagnetic Interference1 X8 }3 k9 T- u! w3 U9 f! l L. ^
Filters (FOKY2) also may be accepted as Operational or Basic Insulation when the capacitors
7 T% j+ E: g2 Y/ ^are used in circuits compatible with their ratings. Therefore, these components do not need to$ [, w# T: O4 a
be provided with an additional, definable insulation level when the capacitor casing is acting as. k% p2 x; c7 H' k' H/ Q6 v
basic or operational insulation.+ Q" W9 E4 |- L* @
RATIONALE:7 x! Z' K- W* @" h( v3 G
Under IEC 60384-14, X1, X2, X3, Y2, and Y3 capacitors are subjected to a minimum Electric+ j8 M! a2 ~/ `2 R: W9 y
Strength Test of 2000 V rms between live parts and case. Y1 capacitors are subjected to a 4000
8 x+ O( U9 ]4 JV test. (Y4 are only subjected to a 900 V test).
3 F# s( t( s" r- q4 V0 o/ hFor Recognized Component FOWX2 capacitors, UL 1414 now covers X1, Y1 and Y2 capacitors,+ o8 [4 ^ g* _# o* h; u+ P4 [# e
and the minimum Electric Strength Test is 2000 V between live parts and case. Y1 capacitors
' e, G( u9 b/ f' T! \& G" ~& k' xare subjected to a 4000 V test.: V! R9 f! \! f2 C1 j; F
For Recognized Component FOKY2 capacitors, UL 1283 requires the insulation between live5 E& w) d/ i- u9 g0 I
parts and casing is required to pass a 2Vr+1500V (Vrating =< 250V) electric strength test.. f6 E3 W0 F4 [& L
Additionally, the case is required to be V-2 or less flammable (or equivalent), and meet UL 746C
: Y: J5 s4 i* Q& J' w+ Y(or generic) insulation requirements./ ~* l( V6 l8 d% A J ]- w
OTHER:
5 K: I' j4 @9 K* _7 IComments:
: R+ v( b! n9 R# C- h, EInterpretation Systems:
, s+ ~7 E9 s' p, |7 e% z" F# b• IEC TC 108 Interpretation Sheets: Q24" o5 r$ t- k9 S: l n" v
• CENELEC OSM/EE Decisions: 1.5.7.1 (95/9, 97/1), 2.10 (95/8)2 X$ _$ s( ?4 m2 u' }+ _, G
RELATED APPLICATION GUIDELINE(S): 1.5.6-2 |
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