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

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DSH 542 . f2 ?* T0 p% x: L

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 " d: P; S. E! E$ w$ T  f5 q& x

60950-1(ed.1)

) Z% J' }! [1 I6 j: yStandard:
6 {$ l# O  d6 A" D" I; iIEC 60950-1, ed. 1
5 \  _5 ]# w! j. JSub clause:
2.10.5.4, Third paragraph
Dec. No.
! v( Z$ A1 `! g$ g: e3 D4 R% ?, ]DSH-542
$ d. T1 {  a6 I( w: M4 X  L; MSubject:
/ l4 K) ~" `& @' r# w" {8 BApplication of Annex U and 2.10.8 to
* n+ [9 X% k# M9 j& O8 v! M, D; B$ _! dspirally wound insulation required to be
treated as a cemented joint
2 ^# f% T" c$ Q0 IKey words:
spirally wound insulation;
cemented joints;
- }+ l- o8 M* b' ]( qAnnex U.2
Decision of:
40th CTL meeting /2003
8 }, Z% G9 p8 R+ [( sQuestion:
When applying the 3rd paragraph of 2.10.5.4, what is the intent of the requirement for spirally wrapped
7 t1 m7 K% B* ]+ g: ?/ g& ?/ Finsulation (tape) when the CLEARANCES and CREEPAGE DISTANCES between layers, as wrapped, are
less than the required minimum value for Pollution Degree 1?
Decision:
The intent is, if the CLEARANCES or the CREEPAGE DISTANCES between layers, as wrapped, are less than
the required minimum value for Pollution Degree 1, the spirally wrapped insulation should be sealed and pass
the tests of both:
2 T' a) Q, Q9 H0 U# }" Y· Annex U, which requires an electric strength test per Annex U.2 at the voltage specified in U.2;
and
5 Q; e( L- M/ Z9 t$ h: Q· 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.
( q; f5 L  E8 B$ ]( a5 O+ A
8 c- m8 B9 g2 p/ i) j
7 f2 D( Q) r& n% M2 L+ e* v" X