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VIENNA – OSM/EE MEETING FOR ELECTRONIC EQUIPMENT 05 – 06 MAY 2010
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-ITEM FORM-) w6 a, p0 P8 I. g' x3 U0 W
BSI – United Kingdom/N° 1/20101 [7 [/ B2 Z0 ^7 T
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Standard:
$ `' V8 L8 ]$ aEN 60950-1:2006+A11+A1) n. b `6 d& L9 C
and EN 60065:2002+A1
{' C4 P/ K/ q8 R: _+ B( n" x Sub clause:
/ h* y" I/ x) h q) S' U) a2.10.5.6 (EN 60950-1)
% f+ b y3 c* ^- I8 |7 W8.8 (EN 60065)
$ f; s" k2 B" x: g Sheet No.:
# ], ?& V& S0 y/ s" GPage 1 of 19 n: w6 H* y( `, X- i; T
Decision 10/1; b5 q8 W8 I! h5 |5 I
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Insulation on the body of electrolytic capacitors3 i. I* Q+ C/ k1 K( S. t1 w
Key words:4 S/ T2 M$ ^; Z) ]1 C W
Insulation
- h4 g" @% W: F6 xThin sheet material Meeting:
) v4 g( m1 w- J0 M9 POSM 2001,
9 P( G, L; [) B* O$ b$ S8 c" G7 bAgenda item n° 9.6
. Q7 W4 F# ^1 oOSM 2010-05-05,0 @; V$ I. Y( z
Agenda item n° 6.1
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Question 1) Minimum distance through insulation
/ B$ p) b: m. m& \- ^3 H& g" ICan the insulation of an electrolytic capacitor be regarded as basic insulation?" J3 D. C) z' k( e
(see attached photo) ?
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2 o5 j0 }( n# ^Along the side of the component the plastic insulation will withstand the electric strength test (1500V ac). However on the top and bottom of the capacitor the plastic is stretched / bended around the edge, and the insulation can therefore be mechanically stressed. The question is, can this be accepted as long as the insulation withstand the electric strength test, without any further considerations? m; d$ N1 ]" j# n# p' p+ a
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3 z" d+ y; n6 Q; }1 p+ a# z--------------
) P3 N& t4 Z. b0 l0 C1 h5 hQuestion 2) A common failure mode of electrolytic capacitors causes a pressure build up within the component, which results in the capacitor expanding in size, to the point where the outer marking sleeve/insulation may split – exposing the capacitor can (normally connected to the negative capacitor terminal).
3 i p4 T" v$ y+ {0 @( @7 gIs it permissible to consider that the outer marking sleeve/insulation of electrolytic capacitors, as meeting the requirements of thin sheet material (EN 60950-1:2006 Sub-clause 2.10.5.6 and EN 60065:2002 Clause 8.8), without taking into account this possible failure mode?0 @2 T( w v3 P- {8 J) r8 F* H, \
* b. k3 d9 P4 wOSM EE conclusion: 1 decision 0 only in the minutes ) U" _4 B$ {$ L7 q6 h) R1 f! h* b
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Decision 10/1:
% w" ?% m' s. N7 i+ t/ \( g- NThe conclusions from OSM 2001, agenda item 9.6 was agreed to be applied and converted to Decision 10/1, item 1:) M L x, @0 A) p
On the side the insulation can be regarded to comply with the requirements for basic insulation, but on the bottom or top side all manufacturing tolerances have to be taken into account. Information of the manufacturer (especially variation due to ageing) is needed.
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Decision 10/1, item 2:- |. q, b3 F+ J/ F, J& L4 M
Requirements for failure mode are to be taken into account.
- }- @3 }9 R) V/ z$ W3 pEN 60950-1 Clause 5.3.9; Compliance criteria for abnormal operating and fault conditions.+ ?" ?" T8 X) ?
60065 Clause 11; Fault conditions.
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6 i6 v8 l$ W5 P# \& hIs to be send to MT1 and MT2 (October meetings 2010) for confirmation. 1 y. y& H# w4 |: r2 l
Explanatory notes:
. L1 ? K6 G* a6 d _) V, zIf it is a critical component it must be listed in the critical component list., _5 K; a. a0 O* A1 x# |
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