DSH 489 Creepage distances, clearances and distances through insulation

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DSH 489 " `5 ^/ [5 l- j2 ~' v% _

Creepage distances, clearances and distances through insulation

29.2 % G/ ^# s+ {9 F9 p

60335-1(ed.3) ' n# b6 [! p4 M

Standard: IEC 60335-1:1991, 3rd Ed.
  {- f5 T! O9 Z, H1 ySub clause: 29.2
. f5 Z' C( ^6 m' `4 [6 P2 y1 lSheet No. DSH-489
* {' i; n$ F# h) p5 j+ k. XSubject: Creepage distances, clearances and distances through insulation
& G4 Q" W0 v( |- T6 d% D- tKey words: - Distances through insulation - Thin sheet form layers
% d# f$ ~4 y4 Q& @. dDecision taken at the 40th CTL meeting 2003
Question:
! V2 ~& o; D* R- m; ^For the application of the test voltage, how are layers of insulation that are thermally bonded
together treated?
5 n1 U7 ]$ g. M+ vRationale:
, n4 T* z  C  u4 W" GSee question.
. W; b* ~5 x* h" X8 q2 M' E' y1 xDecision:
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
8 I: P% I3 [! A1 {2 \$ q  T5 `2 R/ vmaterial at various stages of the manufacturing process. The manufacturer shall also provide
/ F2 c2 m" M% h; Vevidence that the characteristics of the insulating material have not been degraded by the
bonding process.
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