DSH 489 Creepage distances, clearances and distances through insulation

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DSH 489 % S% M3 D3 t$ \- O

Creepage distances, clearances and distances through insulation

29.2

60335-1(ed.3) ; [& H* P) A# _- I- o% o- u$ g! @

8 K1 U9 l, l% z; ^1 ^) jStandard: IEC 60335-1:1991, 3rd Ed.
* {+ p4 M4 g7 oSub clause: 29.2
, z  R# Z% O, J- n9 |# wSheet No. DSH-489
  Z: |* l' E4 a5 A6 }  r' K; cSubject: Creepage distances, clearances and distances through insulation
$ \4 A% ~, h7 |$ v8 ?; uKey words: - Distances through insulation - Thin sheet form layers
Decision taken at the 40th CTL meeting 2003
Question:
% W; ^# m+ o! KFor the application of the test voltage, how are layers of insulation that are thermally bonded
together treated?
Rationale:
2 k! P9 M$ U' \  k( V. oSee question.
Decision:
+ w4 p& D. [; g, |% X0 SLayers 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
2 w1 @. z" \! G' c" E! greinforced insulation), the manufacturer is to supply separately the layers, or samples of
- e1 Q, Q: }: l0 V4 \0 Hmaterial 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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