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 ...

2.10.5.4, Third paragraph

60950-1(ed.1) 6 t, \4 r! [$ K7 e0 O$ Q# A) l

Standard:
9 ]; _  ?8 A" w0 wIEC 60950-1, ed. 1
; U9 h8 L/ Q5 r8 {4 Z: H) R3 ~Sub clause:
2.10.5.4, Third paragraph
. [! R% r0 D; \2 R  O% m' K2 QDec. No.
% F/ S, P* d) G9 i8 d/ i" k- TDSH-542
, s& U" P4 e& [+ J: |- J7 V$ \Subject:
Application of Annex U and 2.10.8 to
0 w' G9 \5 N9 O5 Q0 Bspirally wound insulation required to be
9 F% l, V" g# |0 W: a: [# t0 ttreated as a cemented joint
Key words:
3 }$ `- B* o7 b% E; h5 xspirally wound insulation;
cemented joints;
( m6 G- f0 e% K2 L4 b$ v1 W2 YAnnex U.2
0 z- U- |8 Q  E* z( W5 eDecision of:
40th CTL meeting /2003
! Q6 l; ~6 n, ~' d( O4 n: GQuestion:
- b) G3 P+ q& o4 zWhen applying the 3rd paragraph of 2.10.5.4, what is the intent of the requirement for spirally wrapped
8 q) K- b! a# C* Y8 winsulation (tape) when the CLEARANCES and CREEPAGE DISTANCES between layers, as wrapped, are
less than the required minimum value for Pollution Degree 1?
+ ?& p. I9 x5 ]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
' Q! F9 x8 q1 G9 cthe 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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