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

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DSH 542 1 n) q2 |9 k1 t/ d/ X

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 * \* A6 E. G5 U/ L6 [2 e

60950-1(ed.1) , B$ l/ a5 k% R  n" E

Standard:
IEC 60950-1, ed. 1
Sub clause:
0 X& I& R) p1 L7 D( e! ?9 m2.10.5.4, Third paragraph
Dec. No.
DSH-542
+ }0 m2 l" E! NSubject:
" d# U4 l6 b1 O' LApplication of Annex U and 2.10.8 to
# ~/ r5 C6 y) k- F7 {0 k6 ^spirally wound insulation required to be
treated as a cemented joint
Key words:
spirally wound insulation;
# R  u8 ?& r4 ^& e3 q  W- |3 ^" n" Ycemented joints;
Annex U.2
: `* p) D  h$ w& qDecision of:
3 ]9 Z8 {; s* G8 l9 ~& W) u3 d40th CTL meeting /2003
4 ]5 w# J- r" Y# k4 D1 X7 xQuestion:
When 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
9 r0 n/ a4 U# K) b- Y- \) h. I5 p1 Cless than the required minimum value for Pollution Degree 1?
Decision:
% Y) [9 b$ w) y# w3 X$ ]) uThe intent is, if the CLEARANCES or the CREEPAGE DISTANCES between layers, as wrapped, are less than
) s8 D& O; x- ~  l8 G% J* |the required minimum value for Pollution Degree 1, the spirally wrapped insulation should be sealed and pass
the tests of both:
' s* z: s$ }! N' H7 P! q· Annex U, which requires an electric strength test per Annex U.2 at the voltage specified in U.2;
4 F, {8 `2 M, `4 ~9 c. v2 B- Oand
* Y3 j! z) N& q- j. b/ H6 b4 c2 ~% O" G) N· 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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