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|  DSH 542
0 x( d7 f' q$ K4 s- J! y% D | Application of Annex U and 2.10.8 to spirally wound insulation required to be treated as a cemented ...; R6 w4 ^2 }5 u& _
| 2.10.5.4, Third paragraph, C7 | e8 N+ I1 S# G u
| 60950-1(ed.1) `6 d3 u3 k5 E7 S- o
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! Q q* P' Y! L+ ~Standard:# l/ a1 z" K) d( R' e4 E6 k% b9 t
IEC 60950-1, ed. 1% B& _( k# d3 |) e1 C: u
Sub clause:+ E$ ?' F3 M0 k
2.10.5.4, Third paragraph& ^- b4 H8 {, y! V0 R$ o
Dec. No.' @0 s" B/ b7 P x h
DSH-542
+ L5 X8 S4 C/ q' Y- ZSubject:
1 S9 N; L1 f5 s6 ~Application of Annex U and 2.10.8 to1 k6 \6 j! y, F& `6 L4 J- k
spirally wound insulation required to be8 m6 ]: }, C6 `& H
treated as a cemented joint
# D+ c0 `! y: u1 {Key words:
7 z/ o/ [# J; m% N$ Bspirally wound insulation;
8 C! \8 w7 c8 Vcemented joints;
( w8 E% c4 [/ k" a* E* yAnnex U.2; Q" `) @% N: L; l! }
Decision of:
+ q5 j8 e s( q) Z7 F! L40th CTL meeting /20037 f; D; q' z/ J6 O$ M4 e. p
Question:3 c- B6 M9 ?: T' c5 ]2 i
When applying the 3rd paragraph of 2.10.5.4, what is the intent of the requirement for spirally wrapped
9 H4 Q8 |# n- U4 a; }7 n, L1 x, Pinsulation (tape) when the CLEARANCES and CREEPAGE DISTANCES between layers, as wrapped, are
- J1 A0 Q$ r* S5 i: D: [: [) yless than the required minimum value for Pollution Degree 1?
' u" U6 c) G. T7 Y! DDecision:
; j- {5 ~7 R7 j5 C* i% d4 f$ UThe intent is, if the CLEARANCES or the CREEPAGE DISTANCES between layers, as wrapped, are less than. N. V+ b) E4 d
the required minimum value for Pollution Degree 1, the spirally wrapped insulation should be sealed and pass1 A- _. N* Q$ H+ q
the tests of both:
/ O1 f. [3 c2 j3 B· Annex U, which requires an electric strength test per Annex U.2 at the voltage specified in U.2;! _6 [; M8 j) q8 U( x
and
e5 o$ K" w1 }! O- Q· 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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