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发表于 2008-11-2 14:42
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DESCRIPTION OF ISSUE:) X% B9 i, h* p7 |! r+ J1 U
Type of Issue: Technical/Certification7 c% j9 I+ O2 n$ i" l' q
What insulation level may the casing of X1, X2, X3, Y1, Y2, and Y3 capacitors under IEC1 m6 }9 n8 `, ^7 x
60384-14, and X1, Y1 and Y2 capacitors under UL 1414 (FOWX2), and capacitors under UL
5 s7 C9 m& i$ O5 R$ Z/ U% j; c: _1283 (FOKY2) be relied upon to act as?8 \" p8 o& K, I2 U. Y- n1 Z) G
APPLICATION GUIDELINE:
9 S' O$ I O# W. aCapacitor casings of Certified X1, X2, X3, Y1, Y2 or Y3 capacitors to IEC 60384-14 may be0 Y# X6 E4 C5 Q1 I* g
accepted as Operational or Basic insulation when the capacitors are used in circuits compatible$ C I" l# O7 s
with their ratings. Therefore, these capacitors do not need to be provided with an additional,# C/ m. L6 D9 s$ E% {- E8 ?
definable insulation level when the capacitor casing is acting as Basic or Operational insulation.
% G* u3 X6 ~$ H(Y1 capacitors may be accepted as Reinforced insulation also.)
1 C" ?, K3 X% M) G6 S; ECapacitor casings of X1, Y1, and Y2 capacitors Recognized to UL 1414 under Across-The-Line
J" O9 S# i4 T) c9 \* JCapacitors, Antenna Coupling and Line-By-Pass Components (FOWX2) may also be accepted
( D4 x$ }; {4 M$ J- j# w/ I3 {# |as Operational or Basic insulation when the capacitors are used in circuits compatible with their
, n9 t; Y7 Z" X6 o% f& [) F4 Uratings. 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
% d' o6 m) Z' H# E$ Nprovided between the capacitor casing and another component or an earthed dead metal part.3 ]0 x8 `0 J2 d0 |
(Y1 capacitors may be accepted as Reinforced insulation also.)
1 i( W* S2 [3 \" FCapacitor casings of capacitors Recognized to UL 1283 under Electromagnetic Interference
4 p: o+ Z& K' X7 V3 Q5 z3 fFilters (FOKY2) also may be accepted as Operational or Basic Insulation when the capacitors
4 y( H2 n8 Y4 S9 Fare used in circuits compatible with their ratings. Therefore, these components do not need to' h! }$ q& y! ]8 {( Y
be provided with an additional, definable insulation level when the capacitor casing is acting as
/ M! ^) |, M' Wbasic or operational insulation.5 |& s7 E7 x# Z* @2 K' z [, ]
RATIONALE:$ h8 S" r$ z, t3 U' n, \2 u
Under IEC 60384-14, X1, X2, X3, Y2, and Y3 capacitors are subjected to a minimum Electric
o/ [& H" G" c* M F% j+ W3 K! LStrength Test of 2000 V rms between live parts and case. Y1 capacitors are subjected to a 4000$ }* f$ e$ ^' H. {) h/ [# U
V test. (Y4 are only subjected to a 900 V test).
, |- Y+ ^% V; s4 QFor Recognized Component FOWX2 capacitors, UL 1414 now covers X1, Y1 and Y2 capacitors,+ ]% a7 _& D# V' ?7 O% r N
and the minimum Electric Strength Test is 2000 V between live parts and case. Y1 capacitors
- m2 U& b, B Mare subjected to a 4000 V test.1 x" s) E2 S% X$ e0 ] q* \( V: J
For Recognized Component FOKY2 capacitors, UL 1283 requires the insulation between live7 p* \% a, G8 ~
parts and casing is required to pass a 2Vr+1500V (Vrating =< 250V) electric strength test.
8 u% a+ R N& S% j4 |Additionally, the case is required to be V-2 or less flammable (or equivalent), and meet UL 746C
2 L4 D; E* P) o9 M+ e(or generic) insulation requirements.
2 c! q9 Z9 q% {3 }! U6 N0 e6 iOTHER:4 d/ Y2 _" P, k0 h
Comments:6 B. L2 B* W# G
Interpretation Systems:7 x/ H( G {2 _7 r/ v# K
• IEC TC 108 Interpretation Sheets: Q24
4 w& |+ b1 G2 x' C) [+ o2 ~3 c• CENELEC OSM/EE Decisions: 1.5.7.1 (95/9, 97/1), 2.10 (95/8). n, ~$ O# d6 v9 V
RELATED APPLICATION GUIDELINE(S): 1.5.6-2 |
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