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 ... & G9 H: t* j  P8 y

2.10.5.4, Third paragraph

60950-1(ed.1) # F4 S2 n$ q* L) }0 C) k

! C9 P, M4 m# {' R0 sStandard:
IEC 60950-1, ed. 1
Sub clause:
2.10.5.4, Third paragraph
  W5 T3 |) T1 s/ a3 [/ o! r6 aDec. No.
DSH-542
9 {) u: |6 L( L- z0 qSubject:
7 n0 Q1 x$ |$ E; ]Application of Annex U and 2.10.8 to
spirally wound insulation required to be
treated as a cemented joint
Key words:
spirally wound insulation;
' Z4 f2 r$ r: T2 Xcemented joints;
# r( P) |3 \- N- S6 f; U$ P$ S# dAnnex U.2
Decision of:
* t  C. U& N; g$ I; `" G40th CTL meeting /2003
Question:
* K# v. P1 t, ^. EWhen applying the 3rd paragraph of 2.10.5.4, what is the intent of the requirement for spirally wrapped
. z, O" n$ x; t0 Dinsulation (tape) when the CLEARANCES and CREEPAGE DISTANCES between layers, as wrapped, are
less than the required minimum value for Pollution Degree 1?
9 F% |/ |9 v% h" s+ Q7 PDecision:
  t7 b7 q! y) u% Z3 F! n6 wThe intent is, if the CLEARANCES or the CREEPAGE DISTANCES between layers, as wrapped, are less than
- @' R2 J' o# ]6 h4 Kthe required minimum value for Pollution Degree 1, the spirally wrapped insulation should be sealed and pass
the tests of both:
· Annex U, which requires an electric strength test per Annex U.2 at the voltage specified in U.2;
and
4 j5 c5 E( R3 }0 {5 ?3 P0 k· 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.