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|
|  DSH 5714 o+ p- J0 D5 w1 F" x
9 h, }- A; X( i% r" v3 c3 a | Creepage/clearance5 U1 y1 v! x0 W5 G
| 29
3 w$ }* ~% P8 o | 60335-1(ed.4)
( \: }; B$ c8 s: n+ ]- [ |
, q$ q* Z/ M0 }7 Y1 \* T
Question:
, d) x0 L2 z* c, \( \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.
" M3 ~3 I" [8 _) H9 ?/ ]IEC 60664-3: 1992 distinguishes between Type A and Type B coatings.( b- U5 f' X8 L+ ]8 q! N/ s
1- Does type A coatings serve to improve the environments from PD2 to PD1?4 n5 D* |. h9 y! E
2- Are creepage distances and clearance requirements applicable between conductors under type B coating? 2 d; c) K0 X" S- k
Decision: t% g- J: w, T8 }( x3 j
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.% P @4 Y) t9 [1 C
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.8 g! F$ q$ I3 g# d/ y! U- m
# f( _1 z% f$ u) Q: @% K: r9 `* e2 h9 l8 R$ ^& ^% E6 J* m. R1 C
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发表于 2012-9-8 20:57
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