DSH 1031 Crossing of triple insulated winding wire

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DSH 1031 , \: o3 I7 A2 B! j ( a4 s+ e3 V0 R) I7 a1 Q- p% Y8 m

Crossing of triple insulated winding wire ( U+ ^7 h" ]% R9 r- D

2.10.5.12 & _1 ^! F) O0 ]- T$ C

60950-1(ed.2);am1

Standard(s) (incl. year) Subclause(s) No. Year
# b: H! j0 a8 JIEC 60950-1:2005/A1
6 X' T( ^  H4 a! H. C$ o" }2.10.5.12 DSH
0 w7 Z9 ]: m, q, J1 M+ O1031
2012
Category
4 M- E6 p4 ?9 @$ KOFF
5 b* T, J. p6 c2 o5 p; b! d4 @- eSubject Keywords Developed by Approved at
. [. r' m5 i; U2 o6 ^2 S0 HCrossing of triple
1 m& c1 x. G( ]3 l. linsulated winding wire
! T8 t2 N; D" k# p& e-Triple insulated wire
# u4 |, T8 \) H1 H3 a% S- Mechanical stress
3 \, c" B$ e+ G8 j9 mrelief
- h) X6 d. p! t- Physical separation
3 r: G" m$ M7 OETF2 2012 CTL
  a6 m4 ^8 k* H% a0 m, xPlenary
9 J# D1 K- h$ r; z6 Q# ?6 U# v" M% TMeeting
Question
Transformers in switching mode power supplies often contain triple insulated winding
wire (=TIW) (wire with extruded insulation layers). These windings typically cross
each other at an angle between 45° and 90° at the exit points as marked in the
Figure below.
# S7 Y( X( {) F2 p1 Y3 z$ e7 x2 AIn the given example TIW is used for secondary circuit windings, whereas the primary
7 Y  z$ ^6 P0 J& pcircuit windings are made of enamel coated wire. Distances between the point where
) L1 y8 v8 o! @+ PTIW crosses itself and primary circuit winding wire do not comply with Basic
(respectively Supplementary) Insulation requirements.
8 D& r  Q, G8 xIs it necessary in the given design to provide either mechanical stress relief at the
crossing point(s) of TIW, or an additional insulation level (e.g., Basic
1 |# R/ k4 @+ q: b(Supplementary)) between the crossing point(s) of TIW and primary circuit parts
7 t8 r, S+ {! |6 H% @; H  D7 @(winding)?
' l8 ?% |, F9 N6 xDecision
No


/ k+ ~# q2 A& W+ ^8 `