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

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DSH 542 4 f% ?. S  O* P4 u# j

Application of Annex U and 2.10.8 to spirally wound insulation required to be treated as a cemented ...

2.10.5.4, Third paragraph

60950-1(ed.1) 0 A! I/ U6 V3 f* Y. {

. p7 H" W' Z+ \1 ]Standard:
8 N# c& ]8 R5 n7 VIEC 60950-1, ed. 1
1 \% C: f) i6 k! h' E2 oSub clause:
4 v$ ?# u# Y$ V0 }9 x2 k$ q2.10.5.4, Third paragraph
1 R! e$ b. A5 i! T3 y  IDec. No.
DSH-542
Subject:
Application of Annex U and 2.10.8 to
2 e; t5 E! Y. h7 Z" L1 Gspirally wound insulation required to be
treated as a cemented joint
1 y: I' c- r% h9 _( [Key words:
spirally wound insulation;
cemented joints;
7 @6 ~: y! y. W; O3 H( jAnnex U.2
$ ?" X1 k; }9 f9 kDecision of:
6 b/ [" H2 N5 R& [* G40th CTL meeting /2003
+ V5 z4 {% b# H3 bQuestion:
1 ]8 O  s( N$ _$ c. M* _When applying the 3rd paragraph of 2.10.5.4, what is the intent of the requirement for spirally wrapped
1 @7 w# g% A$ z" e+ l; ~insulation (tape) when the CLEARANCES and CREEPAGE DISTANCES between layers, as wrapped, are
less than the required minimum value for Pollution Degree 1?
Decision:
3 A/ p8 k$ F+ t+ q3 gThe intent is, if the CLEARANCES or the CREEPAGE DISTANCES between layers, as wrapped, are less than
5 g0 d0 x# M! ^% o3 _! w. {the required minimum value for Pollution Degree 1, the spirally wrapped insulation should be sealed and pass
, ^$ h; r6 V; _the tests of both:
· Annex U, which requires an electric strength test per Annex U.2 at the voltage specified in U.2;
, G4 e& j$ H+ a. ^2 b$ ?6 `$ `% Cand
· 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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