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|  DSH 542
* Z* f) j# V* ]/ G3 j$ T2 L | Application of Annex U and 2.10.8 to spirally wound insulation required to be treated as a cemented ...2 H! Q" |8 A1 r0 i
| 2.10.5.4, Third paragraph+ G7 ?4 H: Q# e( D! l
| 60950-1(ed.1)
6 C. ~- x- z$ p |
! u+ V9 u% d. cStandard:
1 I# T4 i( t9 }IEC 60950-1, ed. 18 @2 Z" {. C: h; b+ J/ t
Sub clause:
]6 _9 R0 S) d1 ^' [2.10.5.4, Third paragraph
9 e+ U/ _+ b, C$ G% Y0 k* oDec. No.* p( x: d& ]3 [& \( M7 `
DSH-542- E: U5 P( F) x
Subject:# P( U: t9 z k1 j' R
Application of Annex U and 2.10.8 to$ @" f& t+ w3 M. {9 g$ E
spirally wound insulation required to be
2 b) k- s* t( ^& D9 \9 v: [0 d5 Utreated as a cemented joint
" ^' z- M4 l8 j' UKey words:
% N; {7 A7 U& Q- j1 h @" aspirally wound insulation;
7 K2 f; D: q1 s* i' r* J$ X* J; }cemented joints;! n7 a: f# q* b. s3 {! [/ ~. y
Annex U.2
3 [, Q$ V, h, DDecision of:' |+ q% d9 e0 h ]! y
40th CTL meeting /2003" c8 D) E$ E' d9 C- X
Question:% R+ @* a1 I, g4 x$ l
When applying the 3rd paragraph of 2.10.5.4, what is the intent of the requirement for spirally wrapped
. [' }/ N3 g& Ainsulation (tape) when the CLEARANCES and CREEPAGE DISTANCES between layers, as wrapped, are
+ r5 W! o) R, a- A* l- q# X Eless than the required minimum value for Pollution Degree 1?
2 [' x% k8 ~6 l& ]8 w( F7 zDecision:
+ F, P! _8 G+ _: R- }The intent is, if the CLEARANCES or the CREEPAGE DISTANCES between layers, as wrapped, are less than( B* G& W) M( U. _
the required minimum value for Pollution Degree 1, the spirally wrapped insulation should be sealed and pass2 B' ?' T2 S! t5 s5 |0 z+ {4 x
the tests of both:& T4 K2 ?. s7 n5 P9 y3 x( \) i% |1 z2 u' w
· Annex U, which requires an electric strength test per Annex U.2 at the voltage specified in U.2;' @& b( ^; ]2 _- H
and9 H* z! S; ~3 ~; P, o. K! _# O& x$ T+ z
· 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.
* @; P8 }, c9 I9 N
! k+ j0 G6 I( n1 O$ E( `8 m+ m/ I2 Q& A
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