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发表于 2008-11-2 14:42
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DESCRIPTION OF ISSUE:
' E8 c# C8 `# n5 CType of Issue: Technical/Certification
' l# Z v3 W- ?5 y' f5 ]0 pWhat insulation level may the casing of X1, X2, X3, Y1, Y2, and Y3 capacitors under IEC- ? L; @0 W, m( u9 C, v) Z& l& D
60384-14, and X1, Y1 and Y2 capacitors under UL 1414 (FOWX2), and capacitors under UL
8 _+ b3 [5 s8 Y# v( D( h1283 (FOKY2) be relied upon to act as?% f( R7 t* ^7 }# m/ h
APPLICATION GUIDELINE:: s3 r& c4 Q9 u& `8 Y$ o. g0 D, G
Capacitor casings of Certified X1, X2, X3, Y1, Y2 or Y3 capacitors to IEC 60384-14 may be5 \+ k+ T. ?% y, [
accepted as Operational or Basic insulation when the capacitors are used in circuits compatible
( D6 `4 f o3 a7 O; ewith their ratings. Therefore, these capacitors do not need to be provided with an additional,* s& h- H/ J1 h3 E# |; I
definable insulation level when the capacitor casing is acting as Basic or Operational insulation./ @, a( S+ Q0 c c! P9 I
(Y1 capacitors may be accepted as Reinforced insulation also.)
5 c1 v+ x& I2 a$ F$ m0 t* pCapacitor casings of X1, Y1, and Y2 capacitors Recognized to UL 1414 under Across-The-Line. j$ y+ w2 ]* R
Capacitors, Antenna Coupling and Line-By-Pass Components (FOWX2) may also be accepted
# C+ G9 S. e( g7 O- P* Xas Operational or Basic insulation when the capacitors are used in circuits compatible with their1 m3 n4 ]+ l+ f* q1 @: {
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
) X/ ]! t/ r9 r7 @: S3 Q l" Uprovided between the capacitor casing and another component or an earthed dead metal part.
9 }) o5 p+ ^8 A(Y1 capacitors may be accepted as Reinforced insulation also.)
2 d5 j- D: d- Q" cCapacitor casings of capacitors Recognized to UL 1283 under Electromagnetic Interference Y5 z3 W9 X6 o: u$ l4 F' Z
Filters (FOKY2) also may be accepted as Operational or Basic Insulation when the capacitors5 k0 m, @6 _1 p9 d- \& Y; o1 Y
are used in circuits compatible with their ratings. Therefore, these components do not need to
; `6 V/ G& d3 f% `4 }; ^( jbe provided with an additional, definable insulation level when the capacitor casing is acting as
9 E7 R" D* B8 [7 abasic or operational insulation.
: k) h3 J+ f$ ERATIONALE:
2 k9 I7 x, e' I, R) f8 t1 x# JUnder IEC 60384-14, X1, X2, X3, Y2, and Y3 capacitors are subjected to a minimum Electric' K3 z( ^+ \* q& c3 J' ~
Strength Test of 2000 V rms between live parts and case. Y1 capacitors are subjected to a 4000/ u1 E3 G8 k& R1 j6 I2 G9 W( N. z: y
V test. (Y4 are only subjected to a 900 V test).
( ?9 M: h: |0 D! O2 l, J* I! ]! IFor Recognized Component FOWX2 capacitors, UL 1414 now covers X1, Y1 and Y2 capacitors,. A0 q: k2 Q! P3 f( V! ~' k
and the minimum Electric Strength Test is 2000 V between live parts and case. Y1 capacitors8 {! I S4 d' R7 `
are subjected to a 4000 V test.' d z! U5 K: a* k8 `
For Recognized Component FOKY2 capacitors, UL 1283 requires the insulation between live7 ~$ c+ w; v( B1 Y& n- A
parts and casing is required to pass a 2Vr+1500V (Vrating =< 250V) electric strength test.
! z \% X" H0 P. o. DAdditionally, the case is required to be V-2 or less flammable (or equivalent), and meet UL 746C+ V# W9 M% t5 `" g' T
(or generic) insulation requirements.% l7 q7 Q o7 \! f! F
OTHER:
7 T) K$ e+ a7 c% N, `. k9 ~. mComments:+ d% U G' D2 Y
Interpretation Systems:
2 e" k) y5 F# V6 E! |• IEC TC 108 Interpretation Sheets: Q24" m9 b* y0 R* r4 m! _) _% i# H
• CENELEC OSM/EE Decisions: 1.5.7.1 (95/9, 97/1), 2.10 (95/8)
7 J/ r; m$ H8 {5 XRELATED APPLICATION GUIDELINE(S): 1.5.6-2 |
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