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| DSH 5429 _+ Y0 A; K% r8 t( N i
| Application of Annex U and 2.10.8 to spirally wound insulation required to be treated as a cemented ...
7 o, t6 T/ B- ?6 ^4 i! H- e* p | 2.10.5.4, Third paragraph$ z% _+ l+ d1 a# |" {! U
| 60950-1(ed.1)
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Standard:
5 b* A! ^/ T8 H6 |1 o" QIEC 60950-1, ed. 1# o; e1 z7 ~& m. k: _# G& _
Sub clause:; C8 a. ~$ W4 u/ C& b3 x5 l
2.10.5.4, Third paragraph
0 H; U8 g4 M$ I, o8 R @Dec. No.& M) L- T9 z' j" B% C u
DSH-542& {$ Z6 J/ | s' `' m
Subject:
! R( N& @6 @3 Y) X& P/ IApplication of Annex U and 2.10.8 to+ r4 w+ C+ s o- g+ F1 D' T
spirally wound insulation required to be6 U% i7 s1 P5 o/ K# R
treated as a cemented joint; Y8 r' _* x/ t: @4 m: ]- f4 H
Key words:
' h8 a9 Q7 z3 P2 W W% }: ]8 Sspirally wound insulation;7 i2 w: I; S' ^1 E% D
cemented joints;
; D: C. Z& s! M8 t" r- DAnnex U.2; V) x# n' \8 V% p3 C. W& o
Decision of:0 z+ r1 k' |. ~4 h5 e; f4 B5 p* b: F
40th CTL meeting /2003
z7 g P* h8 UQuestion:0 T- o8 Z$ U2 L8 @+ J6 b E! b C+ @, J" b7 N
When applying the 3rd paragraph of 2.10.5.4, what is the intent of the requirement for spirally wrapped1 d+ C/ k/ `# K& {, s5 w! c6 Z2 j
insulation (tape) when the CLEARANCES and CREEPAGE DISTANCES between layers, as wrapped, are! L: L2 e$ q9 ~9 o/ h" i: R5 v
less than the required minimum value for Pollution Degree 1?
# v7 A0 M5 z8 ?Decision:# Z u n, P' u. L( _( I
The intent is, if the CLEARANCES or the CREEPAGE DISTANCES between layers, as wrapped, are less than
2 @: Y2 e. ~# `, c/ ^" p4 q6 ethe required minimum value for Pollution Degree 1, the spirally wrapped insulation should be sealed and pass+ f5 Z) g$ [) F) S
the tests of both:# k- G# ~5 t- K0 k4 v' p9 Z9 a3 E' d
· Annex U, which requires an electric strength test per Annex U.2 at the voltage specified in U.2;
; w6 d3 ^+ O- N2 w4 n, F1 Tand
3 @3 X+ G+ c9 u4 o3 K! \4 v* P· 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.) u! I" q) i: p x/ P8 Z% b5 g
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