DSH 489 Creepage distances, clearances and distances through insulation

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DSH 489 & G4 c' H* ]! L2 G   ~: ]5 h- s% z0 v0 n 5 B7 }5 q8 f7 H! `% }2 |# P+ l

Creepage distances, clearances and distances through insulation " u+ W- N. _8 F8 d9 U4 K! j: e

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
, n: e, F& G' ~4 MKey words: - Distances through insulation - Thin sheet form layers
Decision taken at the 40th CTL meeting 2003
) D0 k! I% }- d( q. J. Z6 p' Y5 |& gQuestion:
For the application of the test voltage, how are layers of insulation that are thermally bonded
  h5 O% V# y& |& n5 O: I$ }together treated?
6 t5 B( F2 o2 M, rRationale:
5 k4 v( q+ R! [# n+ J& |See question.
Decision:
4 S9 D) A9 v6 {' h3 [4 {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
5 u2 [1 c5 ^7 V: [0 d8 Flayers. When the number of layers have been determined ( i.e. 2 for supplementary and 3 for
: U- q- z0 r( V7 m& O3 u: sreinforced 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
$ y; m" c- h5 jevidence that the characteristics of the insulating material have not been degraded by the
bonding process.
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