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Question:9 r1 b6 B1 W, i) _ L
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.) T5 P& }3 Q" @1 c. L
IEC 60664-3: 1992 distinguishes between Type A and Type B coatings.: c- C7 c7 x" c! H) H
1- Does type A coatings serve to improve the environments from PD2 to PD1?" i8 s* |) P$ _
2- Are creepage distances and clearance requirements applicable between conductors under type B coating?
* b5 D+ D$ A* P) i, ?; nDecision:0 b1 V/ p7 K2 q" p1 ^9 T' h- E n
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.
# \+ G% {& ^7 N4 P" {: K& O2- 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.$ ?' F8 |& P+ q2 ?
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发表于 2012-9-8 20:57
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