DSH 489 Creepage distances, clearances and distances through insulation

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DSH 489 6 N! Z, B+ c* _6 U: N% T. h" ~( q) U 6 P8 K. U, H% v1 ]2 T' w

Creepage distances, clearances and distances through insulation , z/ v2 X; a+ ^6 \7 _8 ?; [. v

29.2 5 y* q0 J4 K& G) Y7 K8 s) e) F

60335-1(ed.3)

9 a- D  O. g: L" D5 d+ GStandard: 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
+ ]. i! M2 L; {' c! IQuestion:
For the application of the test voltage, how are layers of insulation that are thermally bonded
: h1 n. a' j1 H. i2 W) {5 `- ?together treated?
7 Q* X6 ]0 q8 A! }Rationale:
' C+ _- g, i4 R' E0 B3 cSee question.
9 {8 S" G0 S0 P; p9 e' A# PDecision:
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
: m1 K7 c# n6 I/ c3 _) {material at various stages of the manufacturing process. The manufacturer shall also provide
0 J2 o9 S$ s  \evidence that the characteristics of the insulating material have not been degraded by the
1 X- G* q: ?6 |, G3 Cbonding process.
7 |9 U) C. D1 o% ~& c
9 e  {2 Y% N4 g8 h
+ i( L( m3 c5 u  D2 a
0 _1 o! e$ A' F" ~0 B8 \" U7 }9 z
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