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发表于 2008-11-2 14:42
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DESCRIPTION OF ISSUE:' _; h) o) S+ Z
Type of Issue: Technical/Certification
/ J# q- w6 K# u8 a- J- _( tWhat insulation level may the casing of X1, X2, X3, Y1, Y2, and Y3 capacitors under IEC" H3 ]3 u2 j& c8 b$ D, K- [) J
60384-14, and X1, Y1 and Y2 capacitors under UL 1414 (FOWX2), and capacitors under UL* Y; e5 \2 h$ h3 x
1283 (FOKY2) be relied upon to act as?
9 d1 \! F) G+ L3 QAPPLICATION GUIDELINE:7 O: f& M( L( U! U
Capacitor casings of Certified X1, X2, X3, Y1, Y2 or Y3 capacitors to IEC 60384-14 may be5 e e E( `; f- m( \. V
accepted as Operational or Basic insulation when the capacitors are used in circuits compatible
) o/ b; G t! wwith their ratings. Therefore, these capacitors do not need to be provided with an additional,
3 U$ q+ u, ]; @; vdefinable insulation level when the capacitor casing is acting as Basic or Operational insulation.4 z* S) l8 E7 V1 G5 u* X/ F
(Y1 capacitors may be accepted as Reinforced insulation also.)4 T4 E- _+ u7 k5 `( v, z: Y
Capacitor casings of X1, Y1, and Y2 capacitors Recognized to UL 1414 under Across-The-Line
2 K6 L9 R) m+ A7 U* hCapacitors, Antenna Coupling and Line-By-Pass Components (FOWX2) may also be accepted: x9 o& f N7 Z8 e& Z; ~
as Operational or Basic insulation when the capacitors are used in circuits compatible with their m9 R8 |& c+ W2 E6 e# a
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 not0 |2 s; d' ]. q. O
provided between the capacitor casing and another component or an earthed dead metal part.' @& p1 ]% {5 g. O
(Y1 capacitors may be accepted as Reinforced insulation also.)) {4 G; N/ V, X5 ^9 B O! K
Capacitor casings of capacitors Recognized to UL 1283 under Electromagnetic Interference& ?- c; n3 p! o$ s
Filters (FOKY2) also may be accepted as Operational or Basic Insulation when the capacitors4 k/ h4 j2 D6 R( j( A7 l
are used in circuits compatible with their ratings. Therefore, these components do not need to- t& C1 L) J! Q6 P* f3 R6 y5 C7 U
be provided with an additional, definable insulation level when the capacitor casing is acting as$ r$ u" P/ @1 J1 g% e
basic or operational insulation.: P, C; G4 B6 e
RATIONALE:4 v/ W+ W% C; N" }. [8 C
Under IEC 60384-14, X1, X2, X3, Y2, and Y3 capacitors are subjected to a minimum Electric! B1 y9 y6 M5 y6 H8 h5 V1 }
Strength Test of 2000 V rms between live parts and case. Y1 capacitors are subjected to a 4000
1 M3 \! s; _' pV test. (Y4 are only subjected to a 900 V test).# Z* Z# a+ w$ D1 E% @0 y
For Recognized Component FOWX2 capacitors, UL 1414 now covers X1, Y1 and Y2 capacitors,' N' _+ r$ m3 ?
and the minimum Electric Strength Test is 2000 V between live parts and case. Y1 capacitors
7 t9 I* Y3 }7 T7 m# n sare subjected to a 4000 V test.3 M9 a- y Q4 Y
For Recognized Component FOKY2 capacitors, UL 1283 requires the insulation between live+ t0 B1 G4 v1 l3 h+ d
parts and casing is required to pass a 2Vr+1500V (Vrating =< 250V) electric strength test.+ Z- l4 v& K4 `: x4 ]7 J
Additionally, the case is required to be V-2 or less flammable (or equivalent), and meet UL 746C" l K+ @" p z; e2 D
(or generic) insulation requirements.9 m- y M% X1 u" U" X0 i) s
OTHER:" X( f1 ^2 Y5 z+ }3 G" \
Comments:0 E; q2 B8 C* G. |1 q5 }8 ^0 P
Interpretation Systems:
# S" N. V% _# l" q) u0 J2 P• IEC TC 108 Interpretation Sheets: Q24' Z( e( E. c1 r
• CENELEC OSM/EE Decisions: 1.5.7.1 (95/9, 97/1), 2.10 (95/8)
4 P* j! w v9 Q- p) Q ERELATED APPLICATION GUIDELINE(S): 1.5.6-2 |
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