DSH 1031 Crossing of triple insulated winding wire
http://decisions.iecee.org/icons/ecblank.gif DSH 1031
Crossing of triple insulated winding wire
2.10.5.12
60950-1(ed.2);am1
Standard(s) (incl. year) Subclause(s) No. Year
IEC 60950-1:2005/A1
2.10.5.12 DSH
1031
2012
Category
OFF
Subject Keywords Developed by Approved at
Crossing of triple
insulated winding wire
-Triple insulated wire
- Mechanical stress
relief
- Physical separation
ETF2 2012 CTL
Plenary
Meeting
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.
In 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.
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
(Supplementary)) between the crossing point(s) of TIW and primary circuit parts
(winding)?
Decision
No
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