DSH 426 Triple insulated windings
http://decisions.iecee.org/icons/ecblank.gif DSH 426
Triple insulated windings
57.9, 57.9.4
60601-1(ed.2);am1;am2
Standard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 57.9 57.9.4
Sheet n°: DSH-426
Subject: Triple insulated windings
Key words: Triple, insulated, winding, transformer
Confirmed by CTL at its 39th meeting, in Cologne
Question:
Many manufacturers are using a triple insulated winding wire on a transformer, where
DOUBLE, or REINFORCED INSULATION is required between the primary and the secondary
windings. Is this permitted?
Decision:
This is allowed, but precautions should be taken concerning possible mechanical damages to
the wires. Other requirements of 57.9 shall be applied.
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