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发表于 2008-11-2 14:42
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DESCRIPTION OF ISSUE:3 ^0 N9 y2 s. \
Type of Issue: Technical/Certification
! p* V- Q6 h* x4 y" {What insulation level may the casing of X1, X2, X3, Y1, Y2, and Y3 capacitors under IEC/ h& ~" m0 u: a, A0 w6 O
60384-14, and X1, Y1 and Y2 capacitors under UL 1414 (FOWX2), and capacitors under UL- i/ _* f, d* Q* D# A$ ]: p+ E$ N
1283 (FOKY2) be relied upon to act as?
- B+ _8 M8 k7 h0 aAPPLICATION GUIDELINE:
+ c- Z! a" v" t' H9 \/ Z( m+ T$ \3 {Capacitor casings of Certified X1, X2, X3, Y1, Y2 or Y3 capacitors to IEC 60384-14 may be
! q2 E. ^5 c0 M. m! e, W# Gaccepted as Operational or Basic insulation when the capacitors are used in circuits compatible
B- L3 V7 j6 |4 b: Mwith their ratings. Therefore, these capacitors do not need to be provided with an additional,
0 k8 i) g9 _: Z# {: o8 N: _# udefinable insulation level when the capacitor casing is acting as Basic or Operational insulation.6 a% p6 b. R: j) T9 P( I4 I
(Y1 capacitors may be accepted as Reinforced insulation also.)/ y* E. b: m5 y
Capacitor casings of X1, Y1, and Y2 capacitors Recognized to UL 1414 under Across-The-Line6 |- {( O" Q, u& a. n
Capacitors, Antenna Coupling and Line-By-Pass Components (FOWX2) may also be accepted
4 L7 i! |, j; `% Kas Operational or Basic insulation when the capacitors are used in circuits compatible with their
6 \. a6 d6 ^- p' N' f) Oratings. 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& n; `; l) M/ }; v9 V: @3 k1 W
provided between the capacitor casing and another component or an earthed dead metal part.& v, B! P! q6 g
(Y1 capacitors may be accepted as Reinforced insulation also.)
! J. ?1 A; v9 w9 C+ G/ k$ qCapacitor casings of capacitors Recognized to UL 1283 under Electromagnetic Interference, l+ i( N2 _. d- M6 |1 y8 T
Filters (FOKY2) also may be accepted as Operational or Basic Insulation when the capacitors
0 n+ I; i' L( p- [are used in circuits compatible with their ratings. Therefore, these components do not need to9 i9 J0 ]/ ^2 f4 W$ [2 g
be provided with an additional, definable insulation level when the capacitor casing is acting as* r6 U2 G6 }) F+ _. D5 m* }& V
basic or operational insulation.0 [0 @) b, {) M; `5 [- ]
RATIONALE:
8 d7 x: G/ e- v L" QUnder IEC 60384-14, X1, X2, X3, Y2, and Y3 capacitors are subjected to a minimum Electric
+ A! R' O* h* Q1 y$ F9 H3 U6 x5 N2 ]7 C! cStrength Test of 2000 V rms between live parts and case. Y1 capacitors are subjected to a 4000
1 e5 O U6 [3 X; [; j2 M- I/ `, WV test. (Y4 are only subjected to a 900 V test)., n9 Z0 l( q) t( j3 j3 B ]3 {! [ l
For Recognized Component FOWX2 capacitors, UL 1414 now covers X1, Y1 and Y2 capacitors,3 J" p9 L- `/ a0 x& v5 ~4 R
and the minimum Electric Strength Test is 2000 V between live parts and case. Y1 capacitors6 g$ P! {* R z! T# T8 u
are subjected to a 4000 V test.
: P8 C/ Q1 c( b9 A8 f' EFor Recognized Component FOKY2 capacitors, UL 1283 requires the insulation between live1 e. V. q! X6 i6 y3 a
parts and casing is required to pass a 2Vr+1500V (Vrating =< 250V) electric strength test.& {9 E9 f9 C, V1 p
Additionally, the case is required to be V-2 or less flammable (or equivalent), and meet UL 746C) E0 b! d0 S- F6 X' \8 k# @
(or generic) insulation requirements.
: l1 |) F0 `" I0 BOTHER:' j0 @2 q" \8 D3 G/ B
Comments:
) ]8 p7 ~- J, `& Z* P! @9 QInterpretation Systems:( u4 j! z& e6 i
• IEC TC 108 Interpretation Sheets: Q24
8 p5 q, `) n& v1 T* {• CENELEC OSM/EE Decisions: 1.5.7.1 (95/9, 97/1), 2.10 (95/8)$ h5 T# `% r& a' R; G" d; {' p
RELATED APPLICATION GUIDELINE(S): 1.5.6-2 |
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