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发表于 2008-11-2 14:42
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DESCRIPTION OF ISSUE:3 v0 k1 S' T2 ]! u' P; H
Type of Issue: Technical/Certification
. |8 @- j0 \0 c( s& XWhat insulation level may the casing of X1, X2, X3, Y1, Y2, and Y3 capacitors under IEC
* k W% X8 ]6 p' U+ a6 }: Z60384-14, and X1, Y1 and Y2 capacitors under UL 1414 (FOWX2), and capacitors under UL
# ]5 B' ?3 [, `1283 (FOKY2) be relied upon to act as?/ G3 X5 f3 [: ~0 h l
APPLICATION GUIDELINE:
" R$ g6 [& u) w/ zCapacitor casings of Certified X1, X2, X3, Y1, Y2 or Y3 capacitors to IEC 60384-14 may be) a* p% ? ?) Y3 p# J0 U* N2 |# S% X
accepted as Operational or Basic insulation when the capacitors are used in circuits compatible
. u7 I) R; g1 g! V( jwith their ratings. Therefore, these capacitors do not need to be provided with an additional,( q; _2 X& O: y+ A+ }+ h
definable insulation level when the capacitor casing is acting as Basic or Operational insulation.
, ]2 F! V) F0 g7 E- \(Y1 capacitors may be accepted as Reinforced insulation also.)# x# o2 u* i$ L# C% b9 [
Capacitor casings of X1, Y1, and Y2 capacitors Recognized to UL 1414 under Across-The-Line+ \' l0 u7 q1 F# k+ L
Capacitors, Antenna Coupling and Line-By-Pass Components (FOWX2) may also be accepted
2 x8 U7 U$ t7 }' U" }2 U% Aas Operational or Basic insulation when the capacitors are used in circuits compatible with their
3 ]) W5 G/ @' c) o* Jratings. 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
( W# F/ L: ]1 [provided between the capacitor casing and another component or an earthed dead metal part.4 N& k8 ]! d3 R# r$ H% p
(Y1 capacitors may be accepted as Reinforced insulation also.)& |5 A( k- U/ Q/ \# u: A
Capacitor casings of capacitors Recognized to UL 1283 under Electromagnetic Interference
+ }5 N l$ t5 {9 o+ ?; {! HFilters (FOKY2) also may be accepted as Operational or Basic Insulation when the capacitors8 Y! e+ H- W- t& c
are used in circuits compatible with their ratings. Therefore, these components do not need to
/ _- {# k7 ?- w% N3 gbe provided with an additional, definable insulation level when the capacitor casing is acting as0 X& u9 q& N R3 P; R0 a
basic or operational insulation.% F, [8 v( k4 ~+ W/ }
RATIONALE:8 L v4 ]# e7 |. Q" \0 l9 J2 n: R
Under IEC 60384-14, X1, X2, X3, Y2, and Y3 capacitors are subjected to a minimum Electric+ h, [$ p' h" ]0 H* q3 t! z
Strength Test of 2000 V rms between live parts and case. Y1 capacitors are subjected to a 40008 g5 L8 n( o% ^& y6 s5 X% ~+ F$ n' j
V test. (Y4 are only subjected to a 900 V test).3 X7 X* p% ?/ A* u. w; K' o7 @9 Q
For Recognized Component FOWX2 capacitors, UL 1414 now covers X1, Y1 and Y2 capacitors,
/ P6 `* ?! ^% m) h5 i/ d9 tand the minimum Electric Strength Test is 2000 V between live parts and case. Y1 capacitors2 L% W, f% |& B F
are subjected to a 4000 V test.- }! H- |# C ?* S W3 y
For Recognized Component FOKY2 capacitors, UL 1283 requires the insulation between live
, n; B Q" v! Xparts and casing is required to pass a 2Vr+1500V (Vrating =< 250V) electric strength test.
w7 b: Q0 f: k' o0 R2 z; TAdditionally, the case is required to be V-2 or less flammable (or equivalent), and meet UL 746C/ D0 m: U# V5 b, b N; U
(or generic) insulation requirements., T) \4 }) Z1 I/ ?- f: P" J
OTHER:7 m& c' z/ z, ?4 Z- l* z3 b; P
Comments:: L& L- S# F$ a7 u4 r$ o2 Y- j) Q
Interpretation Systems:# ~9 ?5 z+ m, Y0 W( I$ P* y
• IEC TC 108 Interpretation Sheets: Q24) L3 n( Y3 A) `; F! ~" ~$ W+ b4 h
• CENELEC OSM/EE Decisions: 1.5.7.1 (95/9, 97/1), 2.10 (95/8)0 ?/ I( r( A) Y O# H, X
RELATED APPLICATION GUIDELINE(S): 1.5.6-2 |
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