DSH 1031 Crossing of triple insulated winding wire

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DSH 1031 1 j2 P( R& ~) q, x& ^ , i7 {# m2 X* d; k9 E  Q& j% L9 e

Crossing of triple insulated winding wire 7 v  P9 e. W3 F

2.10.5.12 . K5 D' q# d1 C; D; T/ {$ l

60950-1(ed.2);am1

  C# ^' B" X& c+ RStandard(s) (incl. year) Subclause(s) No. Year
1 ?$ Z8 n5 ^: e% r& `IEC 60950-1:2005/A1
2.10.5.12 DSH
1031
2012
, Y, h5 y. v$ N8 g& nCategory
5 R  V1 v" O' V- N0 VOFF
/ n6 {5 r& b0 p+ h# @Subject Keywords Developed by Approved at
4 Y; K3 X) a5 N- `, l* g1 HCrossing of triple
insulated winding wire
-Triple insulated wire
% f6 R$ d2 k6 g9 q1 y- Mechanical stress
+ ^& W5 a$ p( l" w; u- Irelief
, q# `9 Z9 a8 `- Physical separation
ETF2 2012 CTL
# o: u# Z5 W/ L' N; hPlenary
% G3 x  K( B' s' _Meeting
6 c/ H, q! i9 l/ AQuestion
Transformers in switching mode power supplies often contain triple insulated winding
1 }4 q. V$ I, C8 v8 y- M/ T8 iwire (=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
7 P( t) u! f$ iFigure below.
In the given example TIW is used for secondary circuit windings, whereas the primary
5 E. }+ l$ P$ R* d& ]9 ocircuit windings are made of enamel coated wire. Distances between the point where
5 I& B. t. X7 t/ u" m' @9 r# R  e* `TIW crosses itself and primary circuit winding wire do not comply with Basic
(respectively Supplementary) Insulation requirements.
Is 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
5 A' ^% _0 g' z4 ~% D0 O(Supplementary)) between the crossing point(s) of TIW and primary circuit parts
(winding)?
2 x! u* @9 l& P- b$ XDecision
No
/ Q0 o" V2 W; x& e: b2 N0 ]