DSH 571 Creepage/clearance

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Creepage/clearance 9 n4 K5 u$ e  S: {

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60335-1(ed.4)

% N5 t' D5 q/ w3 j5 LQuestion:
Clause 29 indicates that coatings to Annex J can protect the microenvironment and provide basic insulation. Annex J appears to recognize both Type A and Type B coatings.
$ G) M# A0 B) s- `1 Z7 dIEC 60664-3: 1992 distinguishes between Type A and Type B coatings.
1 |$ M; ]* ~$ o8 ^4 d: h% ]1- Does type A coatings serve to improve the environments from PD2 to PD1?
* {5 E  T. ]. D! R( _2- Are creepage distances and clearance requirements applicable between conductors under type B coating?
3 y/ r8 E# }& Q+ v; sDecision:
1 t3 l# l; J- N& R9 O0 G, \1- Type A coating according to IEC 60664 allows to improve the environment from Pollution Degree (PD) 3 to 1, in the same way it allows the transition from PD 2 to 1.
5 E. S* G7 U9 z/ U" p+ D) d2- Type B coatings do not require creepage and clearance distances between tracks covered by this type of coating but for type A coating, distance for PD 1 applies.

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