DSH 253A Resistance to tracking

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DSH 253A ( a9 ~& T! P; j4 A; H3 ^' i* o 3 i) |; A9 a% X& y3 K3 n# \

Resistance to tracking ) O% z5 V1 c4 p1 ^2 C

30.3 7 Y& @. m+ J# X! [

60335-1(ed.2) * |6 ?) w) {7 V* |2 k: U

Standard: IEC 335-1, Ed.2
Sub clause: 30.3
Sheet n. 253 A
+ x7 b1 [  V' b# M7 y$ ZSubject: Resistance to tracking
Key words:
- tracking
Decision 16 of 34th meeting/1997
3 n. S% ~. T+ b) }8 w7 E6 p( ]0 x  ZQuestion:
3 `6 M3 u3 p, I4 B* n+ p* ], z8 S" BWhat is the minimum potential below which a tracking path is not any more liable to
* O' T! N" H  H: ]" _# T9 @7 a+ Xoccur and therefore the test is not necessary ?
Decision:
Based on subclauses 2.9.4, note 1, and 8.1.4, no tracking test is needed for SELV
and PELV circuits.

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