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发表于 2008-11-2 14:42
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DESCRIPTION OF ISSUE:
: o7 U/ i% @' L# n: @3 cType of Issue: Technical/Certification) k" p6 g7 s4 `3 P" b
What insulation level may the casing of X1, X2, X3, Y1, Y2, and Y3 capacitors under IEC" T/ j$ j- [; u- ~8 W5 q
60384-14, and X1, Y1 and Y2 capacitors under UL 1414 (FOWX2), and capacitors under UL
5 `# a1 w6 b- z2 u1283 (FOKY2) be relied upon to act as?
# P* B5 x7 ]+ ], ]4 O& ZAPPLICATION GUIDELINE: ]( q r) F, }- E: c
Capacitor casings of Certified X1, X2, X3, Y1, Y2 or Y3 capacitors to IEC 60384-14 may be1 j2 B9 Z4 q! v* n/ N
accepted as Operational or Basic insulation when the capacitors are used in circuits compatible
. ^: z9 K3 z$ S: ewith their ratings. Therefore, these capacitors do not need to be provided with an additional,. G! h9 B6 N S
definable insulation level when the capacitor casing is acting as Basic or Operational insulation.0 T" s2 V+ k$ j% U9 d& B
(Y1 capacitors may be accepted as Reinforced insulation also.)
, i% p* {, g- p2 K3 |& i4 H0 z$ NCapacitor casings of X1, Y1, and Y2 capacitors Recognized to UL 1414 under Across-The-Line
I" K- s3 L1 z' I& c+ F. l: TCapacitors, Antenna Coupling and Line-By-Pass Components (FOWX2) may also be accepted
1 D7 ~7 b( E) l+ {as Operational or Basic insulation when the capacitors are used in circuits compatible with their
& }4 A# M W* a9 gratings. 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* Q) {9 k9 B- K
provided between the capacitor casing and another component or an earthed dead metal part.5 q( z5 S5 H! }$ E' A
(Y1 capacitors may be accepted as Reinforced insulation also.)
9 l/ H6 c6 W& m+ c4 U0 Z9 ~/ qCapacitor casings of capacitors Recognized to UL 1283 under Electromagnetic Interference4 Y g) Q9 k, h- h' C) c |. ~3 ^
Filters (FOKY2) also may be accepted as Operational or Basic Insulation when the capacitors
9 w+ Y g+ U9 O1 nare used in circuits compatible with their ratings. Therefore, these components do not need to
) s( z8 |6 I: t+ ybe provided with an additional, definable insulation level when the capacitor casing is acting as, z' t2 ^3 C# F% }. K. O# ]& k1 G
basic or operational insulation.- _. O& @% f1 k" ~3 Y
RATIONALE:9 A% e/ A) v& O+ a2 k8 a
Under IEC 60384-14, X1, X2, X3, Y2, and Y3 capacitors are subjected to a minimum Electric% B0 {* L2 e6 x4 n' H% j2 ^# J
Strength Test of 2000 V rms between live parts and case. Y1 capacitors are subjected to a 40003 \; }/ L+ t [$ c7 X
V test. (Y4 are only subjected to a 900 V test).
* G8 U, R% F& VFor Recognized Component FOWX2 capacitors, UL 1414 now covers X1, Y1 and Y2 capacitors,( i& Q* {( T! r! m O& M
and the minimum Electric Strength Test is 2000 V between live parts and case. Y1 capacitors
/ y, G9 W% C" n D6 ware subjected to a 4000 V test.7 r' \. v2 B) \3 v+ d" m7 m
For Recognized Component FOKY2 capacitors, UL 1283 requires the insulation between live. S+ q( t, m- K; ~8 ]1 ^
parts and casing is required to pass a 2Vr+1500V (Vrating =< 250V) electric strength test.
( }8 M1 f' S1 [/ l" Z" h- qAdditionally, the case is required to be V-2 or less flammable (or equivalent), and meet UL 746C. F. j, P. ^# _" j, N, |9 p1 u
(or generic) insulation requirements.3 ?" ^) c H3 M; E' N
OTHER:; h0 O5 N7 m+ E& J7 [( e. m
Comments:2 M& Q! z% R _
Interpretation Systems:
) h1 c; U' P% N" h• IEC TC 108 Interpretation Sheets: Q24
$ k) p' k. N1 U% B" T; R3 B• CENELEC OSM/EE Decisions: 1.5.7.1 (95/9, 97/1), 2.10 (95/8)
, u4 n, `+ v0 m) B; n% {RELATED APPLICATION GUIDELINE(S): 1.5.6-2 |
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