DSH 1031 Crossing of triple insulated winding wire

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DSH 1031

Crossing of triple insulated winding wire 7 E3 K7 b/ j5 U% o4 ]( t4 P

2.10.5.12 ; Y: Y8 k" b' S

60950-1(ed.2);am1 , b) L  y; _5 c. p+ K- ?" A1 B' A

Standard(s) (incl. year) Subclause(s) No. Year
IEC 60950-1:2005/A1
, x/ T3 S; ]# D9 K& y2.10.5.12 DSH
$ b& H& f9 R, G" v1031
2012
7 [" B/ g0 [# s. BCategory
6 Q9 p; }  P/ SOFF
/ A( x* ]0 j. U6 OSubject Keywords Developed by Approved at
. Y' ], k! I; T) A' \Crossing of triple
insulated winding wire
-Triple insulated wire
, L( u. d6 x6 S- T+ D6 S3 [, }, e" H; U* V- Mechanical stress
relief
- Physical separation
ETF2 2012 CTL
! y8 c: `& _9 A0 p9 X6 [1 JPlenary
Meeting
! h/ e9 H' L9 _: d2 TQuestion
0 T% Y* F+ G- ?, r0 WTransformers in switching mode power supplies often contain triple insulated winding
wire (=TIW) (wire with extruded insulation layers). These windings typically cross
( w  e2 K$ D0 G) D+ E3 Reach other at an angle between 45° and 90° at the exit points as marked in the
Figure below.
3 d1 b$ `8 h# bIn the given example TIW is used for secondary circuit windings, whereas the primary
circuit windings are made of enamel coated wire. Distances between the point where
TIW crosses itself and primary circuit winding wire do not comply with Basic
(respectively Supplementary) Insulation requirements.
- W. o# K; H* G0 m- LIs 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
" v5 l/ |, t8 p/ Q( ?6 M: ~+ @(Supplementary)) between the crossing point(s) of TIW and primary circuit parts
  n/ I- B, d: q- }- V* [(winding)?
Decision
No


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