DSH 542 Application of Annex U and 2.10.8 to spirally wound insulation required

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DSH 542

Application of Annex U and 2.10.8 to spirally wound insulation required to be treated as a cemented ... " y9 }3 Y" B) E  |( Z& y2 G

2.10.5.4, Third paragraph 3 B  c2 R: @) Y* V/ v5 \1 K9 X

60950-1(ed.1)

& }# h  F$ X& m- sStandard:
IEC 60950-1, ed. 1
' X0 @6 z" p) kSub clause:
2.10.5.4, Third paragraph
Dec. No.
DSH-542
Subject:
Application of Annex U and 2.10.8 to
5 G( P7 H2 [" U  s; \spirally wound insulation required to be
8 g0 ?1 J  Z: U2 btreated as a cemented joint
Key words:
, V8 F5 A6 p/ Lspirally wound insulation;
cemented joints;
0 g/ n3 _9 j7 L- U8 K) W% L! eAnnex U.2
) V. n: r  n* j0 [5 i) ^Decision of:
6 H1 v' K5 h; ?# l1 @$ A/ M; M) h40th CTL meeting /2003
, k$ i7 H: H9 ~$ s* _- LQuestion:
! c  n0 u( n. Y( h# L! t3 DWhen applying the 3rd paragraph of 2.10.5.4, what is the intent of the requirement for spirally wrapped
insulation (tape) when the CLEARANCES and CREEPAGE DISTANCES between layers, as wrapped, are
less than the required minimum value for Pollution Degree 1?
8 Q- D% o- U# A# i3 K3 j$ {. ?  UDecision:
The intent is, if the CLEARANCES or the CREEPAGE DISTANCES between layers, as wrapped, are less than
& J9 _1 J' m2 ^3 G/ B: m9 Qthe required minimum value for Pollution Degree 1, the spirally wrapped insulation should be sealed and pass
the tests of both:
' p. K. J* S7 p" z· Annex U, which requires an electric strength test per Annex U.2 at the voltage specified in U.2;
9 i) [5 K* }$ A7 T; n. Nand
% v" _# G7 i5 i  E7 s5 @· 2.10.8, which requires an electric strength test of 1.6 times the values in 5.2.2 after the testing in 2.10.8.

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! I; F1 I4 O4 o$ H7 p- U