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发表于 2008-11-2 14:42
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DESCRIPTION OF ISSUE:0 N0 s, z5 q6 h h7 U9 K; e
Type of Issue: Technical/Certification
! \* s* W+ s2 X5 Q5 a+ ZWhat insulation level may the casing of X1, X2, X3, Y1, Y2, and Y3 capacitors under IEC: s) k7 M5 f$ l! h3 ^) Q
60384-14, and X1, Y1 and Y2 capacitors under UL 1414 (FOWX2), and capacitors under UL
0 s+ I7 Y" R$ G& z3 w4 J% T" \1283 (FOKY2) be relied upon to act as?- P5 r+ N. n+ G, p. q
APPLICATION GUIDELINE:
- z* W( q1 @3 ?Capacitor casings of Certified X1, X2, X3, Y1, Y2 or Y3 capacitors to IEC 60384-14 may be
; S( t) q# i3 K0 u& Q0 Haccepted as Operational or Basic insulation when the capacitors are used in circuits compatible
$ ?; n6 ~4 J2 h4 ~" F. z) Wwith their ratings. Therefore, these capacitors do not need to be provided with an additional,# R6 `! U+ }! e
definable insulation level when the capacitor casing is acting as Basic or Operational insulation.4 H0 O: l- B$ K, |5 p9 @
(Y1 capacitors may be accepted as Reinforced insulation also.)2 W2 @& a" D; ]; o+ I8 X
Capacitor casings of X1, Y1, and Y2 capacitors Recognized to UL 1414 under Across-The-Line5 o) S) R+ i. Q9 M
Capacitors, Antenna Coupling and Line-By-Pass Components (FOWX2) may also be accepted
1 M/ A; ?3 n3 C% Z$ I: ]0 a3 w/ \as Operational or Basic insulation when the capacitors are used in circuits compatible with their- R9 |, }1 m- 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
( I" h0 r h6 f# A1 Z, Tprovided between the capacitor casing and another component or an earthed dead metal part.4 J/ H. S& ^% c. P5 m' z" [4 a
(Y1 capacitors may be accepted as Reinforced insulation also.)
/ E5 b% q4 Z( V0 p/ }% [# g" YCapacitor casings of capacitors Recognized to UL 1283 under Electromagnetic Interference
' m* h/ J/ W. n& A" o2 XFilters (FOKY2) also may be accepted as Operational or Basic Insulation when the capacitors
) I+ E/ I% y$ eare used in circuits compatible with their ratings. Therefore, these components do not need to5 x4 G W! Z7 c, P) z1 J
be provided with an additional, definable insulation level when the capacitor casing is acting as
0 f/ h+ ^3 M9 V7 nbasic or operational insulation.$ s( Z% Q: P" j# w/ K' p3 a
RATIONALE:/ l# D' ~0 {% q5 d$ B+ o( w
Under IEC 60384-14, X1, X2, X3, Y2, and Y3 capacitors are subjected to a minimum Electric
& r5 ?9 Q0 \2 x0 ?& d1 GStrength Test of 2000 V rms between live parts and case. Y1 capacitors are subjected to a 4000& z/ }) @3 v6 j( J! ?& i
V test. (Y4 are only subjected to a 900 V test).
; t) v4 o# V U8 E% G: qFor Recognized Component FOWX2 capacitors, UL 1414 now covers X1, Y1 and Y2 capacitors,
# r+ n# s$ M* d* p. pand the minimum Electric Strength Test is 2000 V between live parts and case. Y1 capacitors
7 ]& ~) I" r6 J. J1 zare subjected to a 4000 V test.$ X% a' U5 b! u
For Recognized Component FOKY2 capacitors, UL 1283 requires the insulation between live5 ]7 F, z$ g3 f- V9 W3 c ~ ^" U
parts and casing is required to pass a 2Vr+1500V (Vrating =< 250V) electric strength test.
( ?: x! w. @% W2 L. |! }Additionally, the case is required to be V-2 or less flammable (or equivalent), and meet UL 746C
& z% W# \4 q7 a1 x' a ^# X5 b9 L9 j* H(or generic) insulation requirements. X. t3 s0 ?* ^. j' s
OTHER:3 u, G$ i1 B6 P; S
Comments:
& r/ r' q! s+ [, X2 `+ mInterpretation Systems:7 L6 @0 e7 H, R. s; Q; |
• IEC TC 108 Interpretation Sheets: Q24+ ^4 C0 i7 `2 `& D3 f8 K& K
• CENELEC OSM/EE Decisions: 1.5.7.1 (95/9, 97/1), 2.10 (95/8)7 @( s2 B( n h) U% }& M
RELATED APPLICATION GUIDELINE(S): 1.5.6-2 |
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