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|
|  DSH 571# ~; f) X! u& p+ K* z; S
. A! `- z' w% Q6 _ | Creepage/clearance4 P- Y- s% ]8 k0 p1 F9 I/ \6 \% H5 x
| 29) }' t3 F, `' g" L) u0 W
| 60335-1(ed.4)* k9 W$ F: V7 U h
|
/ y) _- {/ E/ A8 hQuestion:
# o* I0 [' w8 ?" {) kClause 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.: N% a& i+ X7 f
IEC 60664-3: 1992 distinguishes between Type A and Type B coatings.
4 Z1 [' I4 c/ K* A+ P. ^7 s f1- Does type A coatings serve to improve the environments from PD2 to PD1?5 K0 z0 p. I8 T
2- Are creepage distances and clearance requirements applicable between conductors under type B coating?
8 z- t% K. B% d) v, |( E ZDecision:) T/ l8 a! h1 x9 d
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.. w* k g# d. N. K( ~( B
2- 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. _' k; q+ `6 a9 x' C8 E8 }% M
* S; C% k Y6 B- |4 p) I
6 o. l0 z: t$ F! T5 X$ b6 S/ {+ o+ G
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发表于 2012-9-8 20:57
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