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

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DSH 542 3 [2 O" J8 ?. H2 P

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 " ^8 J! g7 [# B1 a/ l: n9 e

60950-1(ed.1) ! t7 d6 f. x2 f4 p+ A

Standard:
: B& c4 Y" @0 z  y; u' p: ZIEC 60950-1, ed. 1
* r. ?$ ]9 o# O; y8 E! @Sub clause:
2.10.5.4, Third paragraph
Dec. No.
0 `( L; f! C2 B- Q2 k# I- e" `5 yDSH-542
' O- R3 N3 Q1 _5 B" ~# ASubject:
Application of Annex U and 2.10.8 to
  d+ Y4 r6 j  o- a2 Kspirally wound insulation required to be
2 ]- h, a4 {& {" o! `treated as a cemented joint
Key words:
( C# U0 J$ Z! ispirally wound insulation;
cemented joints;
Annex U.2
5 W& D1 m% A- s3 f5 \- h0 rDecision of:
& ^- V' y2 F5 r* e4 w9 r: h40th CTL meeting /2003
! U" m6 k# c! H6 G) [9 O) l* x2 k" \Question:
When applying the 3rd paragraph of 2.10.5.4, what is the intent of the requirement for spirally wrapped
  {& o8 M9 ]% c1 g9 \/ linsulation (tape) when the CLEARANCES and CREEPAGE DISTANCES between layers, as wrapped, are
less than the required minimum value for Pollution Degree 1?
Decision:
, p' m8 R7 T2 S7 s4 a' x+ qThe intent is, if the CLEARANCES or the CREEPAGE DISTANCES between layers, as wrapped, are less than
8 M$ m0 h/ y2 G; s) G# I. pthe required minimum value for Pollution Degree 1, the spirally wrapped insulation should be sealed and pass
the tests of both:
& L4 ^/ A+ O# e; u· Annex U, which requires an electric strength test per Annex U.2 at the voltage specified in U.2;
: z  ?) Z  ?/ K' band
) r7 k  X5 Q9 ?$ M· 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.