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发表于 2008-11-2 14:42
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DESCRIPTION OF ISSUE:7 o( k' ^& G( N$ t: X% I& s7 H
Type of Issue: Technical/Certification1 V0 N$ e% R; l& O, a0 N. X% @% z W
What insulation level may the casing of X1, X2, X3, Y1, Y2, and Y3 capacitors under IEC
# H# C! }# M( c3 S- D; Q* ?60384-14, and X1, Y1 and Y2 capacitors under UL 1414 (FOWX2), and capacitors under UL
& U. H q6 Z6 j8 t3 x1283 (FOKY2) be relied upon to act as?, U" [7 n* v7 ?; i# B
APPLICATION GUIDELINE:
* \' n3 ^; k. o @$ t: C0 F/ z7 G$ OCapacitor casings of Certified X1, X2, X3, Y1, Y2 or Y3 capacitors to IEC 60384-14 may be% u1 K$ d. @9 h' Z1 @5 q) C
accepted as Operational or Basic insulation when the capacitors are used in circuits compatible6 W3 |+ \" T8 [
with their ratings. Therefore, these capacitors do not need to be provided with an additional,
. p$ ~- D2 Z$ w& R) Q0 d4 sdefinable insulation level when the capacitor casing is acting as Basic or Operational insulation.
* ]' B/ w+ I9 K+ Z& E(Y1 capacitors may be accepted as Reinforced insulation also.)% `0 @' W; W, Q6 K% `- s( {
Capacitor casings of X1, Y1, and Y2 capacitors Recognized to UL 1414 under Across-The-Line& W. G) l" }0 c' ]
Capacitors, Antenna Coupling and Line-By-Pass Components (FOWX2) may also be accepted
5 x3 v: f. P. u9 l4 U, j `7 Tas Operational or Basic insulation when the capacitors are used in circuits compatible with their
/ t+ z. J0 Z/ Y7 E" o% a4 V) p: c: yratings. 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
) T- R' R! J& T6 x4 Bprovided between the capacitor casing and another component or an earthed dead metal part.; t( G8 Q! ]5 H/ v1 w
(Y1 capacitors may be accepted as Reinforced insulation also.)2 I# t7 a; b z: `0 {1 B' k
Capacitor casings of capacitors Recognized to UL 1283 under Electromagnetic Interference
& U! l2 n# o$ j- H- SFilters (FOKY2) also may be accepted as Operational or Basic Insulation when the capacitors! \; G1 p; F! j$ }: _
are used in circuits compatible with their ratings. Therefore, these components do not need to w% K' u3 n- |" t
be provided with an additional, definable insulation level when the capacitor casing is acting as$ U9 F+ A- q! G& ^
basic or operational insulation.4 C0 J7 R* W9 r
RATIONALE:
/ ?% @' S% A; N' j7 L' {' d- oUnder IEC 60384-14, X1, X2, X3, Y2, and Y3 capacitors are subjected to a minimum Electric
. K% |. U, U: h' z! `Strength Test of 2000 V rms between live parts and case. Y1 capacitors are subjected to a 4000. @3 D9 D! E8 Q2 W( e
V test. (Y4 are only subjected to a 900 V test). ~8 y1 L1 v; s# i% W1 F8 {
For Recognized Component FOWX2 capacitors, UL 1414 now covers X1, Y1 and Y2 capacitors,/ b2 p+ q$ c/ F! p' k' v2 c
and the minimum Electric Strength Test is 2000 V between live parts and case. Y1 capacitors% z$ N3 L; t, ]# t
are subjected to a 4000 V test.
6 f) x0 _4 Z0 o- z( ~For Recognized Component FOKY2 capacitors, UL 1283 requires the insulation between live
3 [% ^. B# x! |, qparts and casing is required to pass a 2Vr+1500V (Vrating =< 250V) electric strength test.# I& k% \; s2 x, B. a2 }$ H
Additionally, the case is required to be V-2 or less flammable (or equivalent), and meet UL 746C$ m% L8 N# h; u! Y# m* ]- M5 O+ \
(or generic) insulation requirements.% t2 |+ f" ~ O+ E
OTHER:
+ ?5 X1 q2 b# {8 Y5 t! xComments:
/ x& h/ n; L' x& c4 C X( E1 DInterpretation Systems:; u6 |8 f" G; D, X4 G
• IEC TC 108 Interpretation Sheets: Q24
) H$ |7 W3 v3 K• CENELEC OSM/EE Decisions: 1.5.7.1 (95/9, 97/1), 2.10 (95/8)
1 S+ l% }, Y# \% C& C- J8 E# m- {RELATED APPLICATION GUIDELINE(S): 1.5.6-2 |
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