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发表于 2008-11-2 14:42
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DESCRIPTION OF ISSUE:
% ^' v2 j+ f4 n* E9 V8 MType of Issue: Technical/Certification
2 ]" k6 B$ ?( jWhat insulation level may the casing of X1, X2, X3, Y1, Y2, and Y3 capacitors under IEC
6 B1 B4 C$ o/ N4 q v4 s8 j0 Y60384-14, and X1, Y1 and Y2 capacitors under UL 1414 (FOWX2), and capacitors under UL
: M+ ?3 x, C5 f+ R# g! U1283 (FOKY2) be relied upon to act as?
7 v3 g0 V5 k, U$ N* KAPPLICATION GUIDELINE:# X& |/ ~2 L# x
Capacitor casings of Certified X1, X2, X3, Y1, Y2 or Y3 capacitors to IEC 60384-14 may be3 y: S/ J! k) P8 C8 w
accepted as Operational or Basic insulation when the capacitors are used in circuits compatible* ^' w" E! l8 H- C% h
with their ratings. Therefore, these capacitors do not need to be provided with an additional,
/ Z& d. @; u- i0 Vdefinable insulation level when the capacitor casing is acting as Basic or Operational insulation.5 ~1 {# f! y- a% r- D
(Y1 capacitors may be accepted as Reinforced insulation also.)$ O& Y; r$ N& c% }
Capacitor casings of X1, Y1, and Y2 capacitors Recognized to UL 1414 under Across-The-Line3 Y! v/ e, b3 u- T$ I9 {5 N" U3 P! o
Capacitors, Antenna Coupling and Line-By-Pass Components (FOWX2) may also be accepted# G: ~+ G# X& _' z. @0 l
as Operational or Basic insulation when the capacitors are used in circuits compatible with their
7 x. e% M; o7 a6 X- u% yratings. 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% i; o$ w* @/ y6 cprovided between the capacitor casing and another component or an earthed dead metal part.1 z( p: O3 r3 s) ^1 o; v# @0 A
(Y1 capacitors may be accepted as Reinforced insulation also.)
& ?5 c- g3 a' Z! B- \* }$ aCapacitor casings of capacitors Recognized to UL 1283 under Electromagnetic Interference
- ~# R4 l* a) V! ^5 E. aFilters (FOKY2) also may be accepted as Operational or Basic Insulation when the capacitors
- I" g. i/ B$ W8 T* vare used in circuits compatible with their ratings. Therefore, these components do not need to
( t. S6 L2 N" ube provided with an additional, definable insulation level when the capacitor casing is acting as2 D$ u* P3 K& s2 w! D& }5 R
basic or operational insulation.
. P G* U& f3 t0 ?RATIONALE:( B& J& P3 E7 S! b
Under IEC 60384-14, X1, X2, X3, Y2, and Y3 capacitors are subjected to a minimum Electric
- p% G1 e/ F. NStrength Test of 2000 V rms between live parts and case. Y1 capacitors are subjected to a 4000
* G& ^; y2 ^0 q% A) NV test. (Y4 are only subjected to a 900 V test).* D2 L2 E. N5 ^+ Q" \# x) Y
For Recognized Component FOWX2 capacitors, UL 1414 now covers X1, Y1 and Y2 capacitors,3 k$ ]) c; |# \1 ]2 V7 a6 ?
and the minimum Electric Strength Test is 2000 V between live parts and case. Y1 capacitors, Y- B" D ]; F% P1 l% V$ |/ q
are subjected to a 4000 V test." `8 D' [" Z5 O2 @
For Recognized Component FOKY2 capacitors, UL 1283 requires the insulation between live
( `1 g* \$ I5 Kparts and casing is required to pass a 2Vr+1500V (Vrating =< 250V) electric strength test.) l7 A2 T6 s$ C# m
Additionally, the case is required to be V-2 or less flammable (or equivalent), and meet UL 746C
& s4 L6 b) w2 I& a5 V( w p(or generic) insulation requirements./ ~' L# R# S+ f! i
OTHER:, `$ } L8 m+ W6 S [) Z
Comments:3 S! U" }3 f' M1 X- R
Interpretation Systems:! H; W1 K# c( P+ s! L2 V4 b2 T
• IEC TC 108 Interpretation Sheets: Q249 q2 O$ C; y4 \+ B" M1 g
• CENELEC OSM/EE Decisions: 1.5.7.1 (95/9, 97/1), 2.10 (95/8)& l0 p* ?4 \* [1 e$ r; P4 L
RELATED APPLICATION GUIDELINE(S): 1.5.6-2 |
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