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

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DSH 542 8 d7 ]+ q4 Y+ H4 l3 M: t3 U

Application of Annex U and 2.10.8 to spirally wound insulation required to be treated as a cemented ... # V6 j1 S6 Z/ k2 i5 u) Q

2.10.5.4, Third paragraph / Z* @$ R4 O! [$ Y

60950-1(ed.1)

Standard:
IEC 60950-1, ed. 1
Sub clause:
2.10.5.4, Third paragraph
: D" P+ x; H3 v% }Dec. No.
; L: a' C0 s! N' j: {8 FDSH-542
Subject:
Application of Annex U and 2.10.8 to
3 ]7 A% ~* G# ospirally wound insulation required to be
treated as a cemented joint
0 |' i+ m4 L7 r  Y7 k3 \" EKey words:
( J; X( s% v4 ^$ Y6 I5 D, _) k; Yspirally wound insulation;
cemented joints;
Annex U.2
Decision of:
$ l; M$ ]) j7 b0 w40th CTL meeting /2003
3 G$ W4 A, ~; O' ]2 [: `0 L+ @# _Question:
When applying the 3rd paragraph of 2.10.5.4, what is the intent of the requirement for spirally wrapped
- v5 D/ R$ h# p/ Q: Linsulation (tape) when the CLEARANCES and CREEPAGE DISTANCES between layers, as wrapped, are
& b  K, X4 s+ M* A4 p3 |, yless 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
6 l! N+ |$ b# z# S6 y6 f2 Bthe tests of both:
· Annex U, which requires an electric strength test per Annex U.2 at the voltage specified in U.2;
) M+ }1 P+ ^& Dand
( }+ f+ C1 O! |5 i$ ^) `· 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.