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发表于 2008-11-2 14:42
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DESCRIPTION OF ISSUE:4 w# R; U _3 C) S% k
Type of Issue: Technical/Certification9 W# l9 N! ?( P8 m5 {
What insulation level may the casing of X1, X2, X3, Y1, Y2, and Y3 capacitors under IEC6 {, N* b5 R- r/ J+ L+ g
60384-14, and X1, Y1 and Y2 capacitors under UL 1414 (FOWX2), and capacitors under UL
9 q( u6 |0 ]2 Q1283 (FOKY2) be relied upon to act as?
' M* {, w1 f9 |8 i: HAPPLICATION GUIDELINE:
" x% ^. G5 Q. mCapacitor casings of Certified X1, X2, X3, Y1, Y2 or Y3 capacitors to IEC 60384-14 may be. z- o1 ?0 i/ ^, Q: r
accepted as Operational or Basic insulation when the capacitors are used in circuits compatible N+ k( J3 a5 |: L4 E' s0 a# _
with their ratings. Therefore, these capacitors do not need to be provided with an additional,4 P. M+ G4 N2 X6 a; e
definable insulation level when the capacitor casing is acting as Basic or Operational insulation.
* W! b$ J. j* q+ M(Y1 capacitors may be accepted as Reinforced insulation also.)# ~4 }/ \3 q2 j4 \
Capacitor casings of X1, Y1, and Y2 capacitors Recognized to UL 1414 under Across-The-Line
' d6 d' D4 P- I- F) G9 u. dCapacitors, Antenna Coupling and Line-By-Pass Components (FOWX2) may also be accepted
6 F5 U# |) y) I# ias Operational or Basic insulation when the capacitors are used in circuits compatible with their/ B- J, Z5 C, [! G% j& T- f5 S
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% m/ r/ V4 v! `, N3 z5 ?2 ^
provided between the capacitor casing and another component or an earthed dead metal part.
3 G% n2 w; n# E# {0 A/ `) E; |(Y1 capacitors may be accepted as Reinforced insulation also.)
( z: H _$ u6 _9 R7 RCapacitor casings of capacitors Recognized to UL 1283 under Electromagnetic Interference+ X0 N* H5 l% {4 ]2 D
Filters (FOKY2) also may be accepted as Operational or Basic Insulation when the capacitors( o5 [# z8 E3 F+ m& A" E, r
are used in circuits compatible with their ratings. Therefore, these components do not need to) L( n V0 B3 K9 x4 r/ P% [
be provided with an additional, definable insulation level when the capacitor casing is acting as; ?+ a$ K- y8 S( q9 s$ h
basic or operational insulation.
. a8 f9 ]6 Y+ F, O: u0 B# a: ARATIONALE:0 I' s) u1 p E% m0 I' s/ s
Under IEC 60384-14, X1, X2, X3, Y2, and Y3 capacitors are subjected to a minimum Electric2 o1 i. N2 P4 ^* W! l8 z" Y
Strength Test of 2000 V rms between live parts and case. Y1 capacitors are subjected to a 40004 o9 h% u6 a6 m) M) f# f
V test. (Y4 are only subjected to a 900 V test).
, |# R) A9 _ h4 l! D0 `For Recognized Component FOWX2 capacitors, UL 1414 now covers X1, Y1 and Y2 capacitors,
* T1 E9 h: a) n( [7 w- zand the minimum Electric Strength Test is 2000 V between live parts and case. Y1 capacitors
1 ]. S8 H) `, v+ D( B1 Y/ i9 e- j! k4 {are subjected to a 4000 V test.
' n# s* ?/ z* K7 ?3 B7 {For Recognized Component FOKY2 capacitors, UL 1283 requires the insulation between live8 W9 X& T0 t) w* a, B
parts and casing is required to pass a 2Vr+1500V (Vrating =< 250V) electric strength test.
! [7 W& |7 ?5 ^5 t' c8 x* oAdditionally, the case is required to be V-2 or less flammable (or equivalent), and meet UL 746C* p c+ U) q4 ^& i- t
(or generic) insulation requirements.) Y4 l; T; s9 F* D# O
OTHER:
* H# U6 j5 w8 Q2 [( [8 ^# E' G& @Comments:/ E) v- r( Z+ X1 S# Y
Interpretation Systems:
: Q- U2 _5 d5 Q) M7 w) j: w& f• IEC TC 108 Interpretation Sheets: Q24
% }/ i+ F" C4 \, O: @7 w; D$ v• CENELEC OSM/EE Decisions: 1.5.7.1 (95/9, 97/1), 2.10 (95/8)) D; G. S0 a, V7 C2 E% o n! Y
RELATED APPLICATION GUIDELINE(S): 1.5.6-2 |
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