DSH 489 Creepage distances, clearances and distances through insulation
http://decisions.iecee.org/icons/ecblank.gif DSH 489
Creepage distances, clearances and distances through insulation
29.2
60335-1(ed.3)
Standard: IEC 60335-1:1991, 3rd Ed.
Sub clause: 29.2
Sheet No. DSH-489
Subject: Creepage distances, clearances and distances through insulation
Key words: - Distances through insulation - Thin sheet form layers
Decision taken at the 40th CTL meeting 2003
Question:
For the application of the test voltage, how are layers of insulation that are thermally bonded
together treated?
Rationale:
See question.
Decision:
Layers of insulation thermally bonded together are considered as one piece unless by the use
of a microscope or any other appropriate means it is possible to determine the number of
layers. When the number of layers have been determined ( i.e. 2 for supplementary and 3 for
reinforced insulation), the manufacturer is to supply separately the layers, or samples of
material at various stages of the manufacturing process. The manufacturer shall also provide
evidence that the characteristics of the insulating material have not been degraded by the
bonding process.
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