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 ... : n. }5 S9 o& \2 W7 i- q$ j

2.10.5.4, Third paragraph 5 n' V- x, r% K' o) b

60950-1(ed.1) : L5 k4 }* D& ]; e

Standard:
IEC 60950-1, ed. 1
Sub clause:
  k: s* f; V2 \  H) F2.10.5.4, Third paragraph
Dec. No.
, I, S  I$ U" D7 D$ ?. P' R- C" E" ZDSH-542
2 B, B  O8 c, D; u( u) qSubject:
  S1 u: Y1 u7 N7 j( G3 m, XApplication of Annex U and 2.10.8 to
spirally wound insulation required to be
( [0 k9 Z# S2 B& N' jtreated as a cemented joint
Key words:
% O9 ?& d7 i2 S0 Z6 Q0 lspirally wound insulation;
cemented joints;
4 _9 F1 I  M3 g+ PAnnex U.2
Decision of:
; H& t* S) z4 n& g1 i40th CTL meeting /2003
Question:
* x6 F! j) X3 ^% g8 x( S0 I( NWhen 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
" E: B! c, Z/ M  ]& gless than the required minimum value for Pollution Degree 1?
* o% N- Y& J5 M8 k% EDecision:
  H$ o  l4 ~8 Z+ O7 JThe intent is, if the CLEARANCES or the CREEPAGE DISTANCES between layers, as wrapped, are less than
. z3 P$ L5 D+ U, W+ e( W4 p+ ~the 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
· 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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