DSH 489 Creepage distances, clearances and distances through insulation

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DSH 489 ( I' Q1 u5 p5 X7 l, k " S) m; m8 @, q0 c6 Y4 Y  c- d

Creepage distances, clearances and distances through insulation

29.2

60335-1(ed.3)

, ]. i! Y% x. R9 X; e6 j, K7 j8 ^Standard: IEC 60335-1:1991, 3rd Ed.
! V1 b2 Q/ N  m& V" q4 ESub clause: 29.2
Sheet No. DSH-489
% |% B) ~: B9 S# C; ^5 GSubject: Creepage distances, clearances and distances through insulation
* q( {& d+ d& W, C" ]% o4 d/ tKey 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
) L- B$ Z3 G1 }5 Z; U0 k1 }together treated?
% c+ g$ r  m7 [$ [' m2 ~3 h9 HRationale:
See question.
Decision:
Layers of insulation thermally bonded together are considered as one piece unless by the use
/ C2 u- j7 @" z0 yof 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
0 D9 y+ O$ x6 I% E6 Hreinforced 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.




* z' `" A+ d% l$ [) Q5 v& {, Z