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发表于 2008-11-2 14:42
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DESCRIPTION OF ISSUE:' v+ U Q1 C& M8 E- _ ^ N; e7 |/ P
Type of Issue: Technical/Certification
q" F' Y5 s9 @9 ^- JWhat insulation level may the casing of X1, X2, X3, Y1, Y2, and Y3 capacitors under IEC
6 b2 o3 R# A, M9 D& R% A60384-14, and X1, Y1 and Y2 capacitors under UL 1414 (FOWX2), and capacitors under UL3 A6 ]9 S' z! w# ?9 ^
1283 (FOKY2) be relied upon to act as?# l* h; O Z/ e3 J- n+ J
APPLICATION GUIDELINE:
5 K7 V# \2 W( T5 G8 U! N7 QCapacitor casings of Certified X1, X2, X3, Y1, Y2 or Y3 capacitors to IEC 60384-14 may be/ E: A [! T4 O6 L5 Z- i
accepted as Operational or Basic insulation when the capacitors are used in circuits compatible
7 `0 t8 s7 y2 b/ zwith their ratings. Therefore, these capacitors do not need to be provided with an additional,
1 N6 O: c# T6 g/ \" m E0 Ldefinable insulation level when the capacitor casing is acting as Basic or Operational insulation.
8 \0 \$ v0 x6 ?(Y1 capacitors may be accepted as Reinforced insulation also.)
- y5 F5 J. X9 }1 Q& SCapacitor casings of X1, Y1, and Y2 capacitors Recognized to UL 1414 under Across-The-Line
\" z7 H$ k7 N8 f" L uCapacitors, Antenna Coupling and Line-By-Pass Components (FOWX2) may also be accepted
1 F8 Z" Y8 r8 w4 T8 h2 J8 uas Operational or Basic insulation when the capacitors are used in circuits compatible with their* D7 p. ^& t& K$ D. c
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* L& f0 k8 P" C) f R: o( }
provided between the capacitor casing and another component or an earthed dead metal part.5 F/ G( M k1 H7 C
(Y1 capacitors may be accepted as Reinforced insulation also.)
, d q& G" ]7 \: YCapacitor casings of capacitors Recognized to UL 1283 under Electromagnetic Interference" A! T+ y% g$ n
Filters (FOKY2) also may be accepted as Operational or Basic Insulation when the capacitors
- d1 p5 ?: t2 U3 Gare used in circuits compatible with their ratings. Therefore, these components do not need to9 y4 o% c( T% G1 G
be provided with an additional, definable insulation level when the capacitor casing is acting as' _% M/ K+ P! c ^/ v
basic or operational insulation.
w4 C: M; ]- H MRATIONALE:9 C8 G# M2 ]& o3 g& p
Under IEC 60384-14, X1, X2, X3, Y2, and Y3 capacitors are subjected to a minimum Electric
: u( q0 P0 ]' Q; C4 E& g) {. s, f4 JStrength Test of 2000 V rms between live parts and case. Y1 capacitors are subjected to a 40000 W1 P+ I6 N6 g5 L ~
V test. (Y4 are only subjected to a 900 V test).6 t* l& b+ t/ v+ K( Y
For Recognized Component FOWX2 capacitors, UL 1414 now covers X1, Y1 and Y2 capacitors,
7 l4 S1 \' Z% `: B& H+ [and the minimum Electric Strength Test is 2000 V between live parts and case. Y1 capacitors
6 C* {5 T4 {: m: Oare subjected to a 4000 V test.
( {4 U% N8 g0 lFor Recognized Component FOKY2 capacitors, UL 1283 requires the insulation between live
, F) x/ T4 [0 Y. x4 xparts and casing is required to pass a 2Vr+1500V (Vrating =< 250V) electric strength test., u! \2 b1 q5 N( n+ j' B9 X! `
Additionally, the case is required to be V-2 or less flammable (or equivalent), and meet UL 746C0 z, M" Q/ Z9 Y J4 a1 c8 ?
(or generic) insulation requirements.2 c) u0 F7 K0 [; x; M7 R/ Q! K
OTHER:$ B! Z* Y/ }) R: I
Comments:
. l9 _! T5 b( T' YInterpretation Systems:
% v8 Z# [' n5 e' {) M, {• IEC TC 108 Interpretation Sheets: Q24
; b O+ `: O* ^* p" P, s• CENELEC OSM/EE Decisions: 1.5.7.1 (95/9, 97/1), 2.10 (95/8). f- L3 b2 A1 s5 c
RELATED APPLICATION GUIDELINE(S): 1.5.6-2 |
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